What does it mean if my hyaline casts are high?

It means the count is above the reference range used with your result, which is less alarming than it sounds for this particular finding. StatPearls gives the normal range as up to 5 hyaline casts per low-power field, and lists concentrated urine, fever, exercise and diuretics as ordinary reasons for the number to rise. Above that figure, hyaline casts are not part of the scoring systems used to grade acute kidney injury, which are built on granular casts and renal tubular epithelial cells instead. Counts have been studied against kidney outcomes and the results are mixed, in whole-field units that do not convert to the per-low-power-field count on your report. So being above the range is a prompt to look at the rest of the urinalysis, particularly protein and specific gravity, rather than a measure of how much is wrong. Take it to the clinician who ordered the test.

Is 0-5 hyaline casts in urine normal?

By the figure StatPearls gives, yes: it states the normal range as up to 5 casts per low-power field, and says only a few hyaline casts may be seen under normal physiological conditions. The figure is not the same everywhere, though, and the range printed beside your own result may be narrower — some laboratories and platforms use a tighter figure, which means a count of 2 to 5 can be flagged as out of range even though a standard reference calls it normal. If your result sits in that gap, that is worth raising with whoever ordered the test. It is also worth checking whether your report counts per low-power field or high-power field, because the two are different areas and the same sediment gives different numbers.

What does a hyaline cast count of 6-10, or 10-20, mean?

It means your count is above the figure StatPearls gives as normal — up to 5 casts per low-power field. Beyond that, none of the sources cited on this page turns those particular bands into grades of severity. Hyaline casts are not in the urine-microscopy scoring systems used for acute kidney injury, which assign points to granular casts and renal tubular epithelial cells instead. Counts have been examined against kidney outcomes: a 2024 study of people with no dipstick protein grouped them as fewer than 10, 10–29, 30–99 and 100 or more per whole field, found no significant trend across the groups, and saw a signal at the single 10-per-whole-field cut-off, from one center and awaiting confirmation. Those are whole-field counts, a different measurement from the per-low-power-field figure on your report, so they cannot be read onto it. What decides whether a raised count matters is the rest of the urinalysis and your clinical picture.

What causes hyaline casts in urine?

They form from Tamm-Horsfall protein, which the kidney tubules secrete and which can set into a cast shaped like the tubule it formed in. StatPearls describes a cast as a coagulum of the trapped contents of the tubule lumen together with that protein. Anything that concentrates the urine or slows flow through the tubules produces more of them, which is why StatPearls lists concentrated urine, fever, exercise and diuretics as normal causes. The same entry also lists pyelonephritis and chronic renal disease. That combination is the important part: the same finding appears in both ordinary and pathological states, which is precisely why the count on its own does not separate them.

Do hyaline casts mean kidney disease?

Not on their own. Hyaline casts are found in healthy people — StatPearls lists them as a normal finding in concentrated urine, fever, exercise and diuretics — and they are also found in kidney conditions. The two cited Perazella acute-kidney-injury scores do not include them. The published urine-microscopy scores used to tell kidney injuries apart are built on granular casts and renal tubular epithelial cells. If kidney function is the question, it is answered by other things: creatinine, eGFR, and the protein on the same urinalysis. A hyaline cast count is not a measure of kidney function and should not be read as one, in either direction.

What does "UA hyaline casts/LPF, Qn" mean on my report?

It is the full name of the test, written in lab shorthand. "UA" is urinalysis. "Hyaline casts" is what was counted. "LPF" means per low-power field — the area of the slide visible at low magnification, which is how this particular count is reported. "Qn" means quantitative, that is, reported as a number rather than as a category like "few" or "many". The matching LOINC term is 5796-8, "Hyaline casts [#/area] in Urine sediment by Microscopy low power field". Some laboratories report hyaline casts as a category instead of a number, under a different code, so a report that says "few" rather than giving a figure is not an error.

What is the difference between LPF and HPF for casts?

They are two different fields of view down the microscope. LPF is low-power field and HPF is high-power field; a high-power field covers a smaller area, so the same sediment examined under high power yields a smaller number. This matters when comparing results. StatPearls reports hyaline casts per low-power field, while the 2008 Perazella urine-microscopy study counted its casts per high-power field. If you are comparing your count against a figure you read somewhere, or against an older result from a different laboratory, check that both are using the same field before concluding anything changed. If your report does not say which it used, that is a question for the laboratory rather than something to assume.

Can exercise or dehydration raise hyaline casts?

Exercise, yes — it is named directly. StatPearls lists concentrated urine, fever, exercise and diuretics as conditions in which hyaline casts are a normal finding. Dehydration is not on that list by name, but concentrated urine is, and going short of fluid is one of the ordinary ways urine becomes concentrated. The mechanism is the same in each case: hyaline casts form from Tamm-Horsfall protein in the kidney tubules, and anything that concentrates urine or slows flow through the tubules produces more of them. So a sample given after a hard run, during a fever, or while taking a diuretic is a sample in which a higher count is expected, as is one given when urine was concentrated. If that describes the day you gave the sample, it is worth mentioning to the clinician, because it changes how the number reads.

How are hyaline casts different from granular casts?

Hyaline casts are the protein matrix alone — clear, with no cells or debris caught in them. Granular casts contain granules within that matrix. The 2008 Perazella study drew the line that way: granular casts are defined by granules contained within a cast matrix, hyaline casts by a cast matrix without cells, colourless. The practical difference is how established each is. Granular casts are in the published urine-microscopy scoring systems, with points assigned by how many are seen. Hyaline casts are in neither of those scores, and the research on their count against kidney outcomes is more recent and less settled. If your report shows both, the granular count is the one with the longer interpretive track record.

Hyaline Casts in Urine: What Your Count Means

Urine

Other names: casts

Optimal Result: 0 - 1.9 casts/lpf.

Urinalysis

From Healthmatters.io Team and reviewed by HealthMatters Editorial Team

Written on October 24, 2026 | Last updated Updated on Oct. 24, 2026

Lab Results Explained and Tracked

At a Glance

Hyaline casts are clear, tube-shaped structures seen when urine is examined under a microscope. They are counted and reported as a number. If your report reads UA Hyaline Casts/LPF, Qn, LPF means per low-power field.

Two things are worth knowing before the number:

A low count is a normal finding. StatPearls gives the normal range as up to 5 casts per low-power field, and notes that only a few hyaline casts "may be seen under normal physiological conditions".
The count is not a severity scale. The urine-microscopy scores used to grade acute kidney injury are built on granular casts and tubular cells, not hyaline ones. Counts of hyaline casts have been studied against kidney outcomes, and the findings so far are mixed — more on that below.

How to read your result

Start with the range printed beside your own number, not a number from the internet. The figure is not the same everywhere: StatPearls gives up to 5/LPF, and the range shown beside your own result may be narrower than that. If your count sits in the gap between the two, that difference is the first thing worth raising with the clinician who ordered the test.

The rest of this page takes the count first, then what moves it.

What your count means

Up to 5 casts per low-power field. This is the figure StatPearls gives as normal. A result of 0, or 0–2, or 3–5 falls inside it. If your report flags a count in this range as out of range, that reflects the range your laboratory applies rather than a disagreement about what the casts are.

Above 5 per low-power field. This is above the reference figure, and what it means is genuinely unsettled — which is a different answer from "nothing is known".

It is not part of any kidney-injury severity score. Two urine-microscopy scoring systems for acute kidney injury — Perazella and colleagues, 2008 and 2010 — assign points to granular casts and renal tubular epithelial cells, with cut-offs at 1–5 and 6 or more. Hyaline casts are in neither. The 2008 study did record hyaline casts in its data collection, but presented no hyaline-specific results.

The count has been studied against kidney outcomes, with mixed results. Ishida and colleagues followed people whose urine dipstick showed no protein, grouping hyaline counts as fewer than 10, 10–29, 30–99 and 100 or more per whole field, and tracked kidney function for up to eight years. Across those four groups they found no significant trend. At one cut-off — 10 per whole field — people above it reached a decline in kidney function sooner, and the authors concluded the count "may be a predictor of renal function decline" in that group. The higher cut-offs showed nothing, and the authors themselves called for other centers to confirm it.

Those numbers cannot be read onto your result. They are counts per whole field, which is a different measurement from the per-low-power-field count on a report like yours. A 10 in one convention is not a 10 in the other, and nothing published converts between them.

So a count of 6–10, or 10–20 per low-power field, is a number above a reference figure, in an area where one study has found a signal at one threshold in one population and no trend overall. What decides whether it matters is the rest of the picture — the other findings on the urinalysis, your symptoms, and your kidney function.

Why the count moves

Hyaline casts form from a protein the kidney tubules secrete, Tamm-Horsfall protein, which sets into a cast in the shape of the tubule. StatPearls describes a cast as a coagulum of the trapped contents of the tubule lumen and that protein.

Anything that concentrates urine or slows flow through the tubules makes more of them. StatPearls lists hyaline casts as a normal finding in concentrated urine, fever, exercise and diuretics. The same list also names pyelonephritis and chronic renal disease, which are not normal states — the point is that the same finding appears on both sides of that line, which is exactly why the count alone does not separate them.

The practical consequence: a urine sample given after a hard run, during a fever, or while taking a diuretic is a sample in which more hyaline casts are expected. Going short of fluid is not named in that list, but it is one of the ordinary ways urine becomes concentrated, which is.

LPF and HPF: why the same number can mean two things

Casts can be counted under low power (LPF) or high power (HPF), and these are different fields of view. StatPearls reports hyaline casts per low-power field. The 2008 Perazella study counted its casts per high-power field. A high-power field is a smaller area, so the same sediment yields a smaller number.

This matters if you are comparing your result with something you read elsewhere, or with an older result from a different laboratory. Check which field your report uses before comparing two numbers. If it does not say, that is a question for the laboratory or the clinician, not something to infer.

If you remember only one thing

A hyaline cast count is a weak signal on its own, and a low one is a normal finding. StatPearls puts the normal range at up to 5 per low-power field and lists concentrated urine, fever, exercise and diuretics as ordinary reasons to see them. The two cited Perazella acute-kidney-injury scores do not include hyaline casts. If your count is above the range your laboratory uses, how much it means depends on the counting method your laboratory used, the other findings on the urinalysis, and your clinical picture — not on the number alone.

Two people, same result

Two people both have 6 hyaline casts per low-power field.

The first gave the sample an hour after a long run on a hot afternoon and has no symptoms. Concentrated urine and exercise are both on the list of ordinary reasons for the count to rise, and nothing else on her urinalysis is remarkable.

The second has had ankle swelling for a fortnight, and his urinalysis also shows protein. Same number, different situation — not because the hyaline casts mean more in his case, but because the protein does.

Nothing in the cast count distinguishes them. The rest of the urinalysis does, and so does what prompted the test.

What this result cannot tell you

It cannot tell you whether your kidneys are damaged. Hyaline casts appear in healthy people and in people with kidney disease, and the two cited Perazella acute-kidney-injury scores do not include them.

It cannot give you a severity grade. Hyaline casts are not in the two cited Perazella acute-kidney-injury scores, and the cited 2024 study, which followed count groups against kidney outcomes, found no significant trend across them.

It cannot be compared across reports without checking the field. LPF and HPF are different areas; the same sediment gives different numbers.

It cannot tell you how concentrated the sample was, which is one of the main things driving the count. The specific gravity on the same urinalysis speaks to that.

It cannot be read alone. Hyaline casts are one line on a urinalysis, and what a count means depends on the counting method, the other findings and the clinical context.

Common interpretation mistakes

Reading a flagged count as kidney disease. Being above a laboratory's range is not a diagnosis, and this particular finding is among the weakest on a urinalysis.

Assuming a higher number is proportionally worse. The cited 2024 study, which followed count groups against kidney outcomes, found no significant trend across them.

Comparing a number to one found online without checking LPF versus HPF. Different fields, different numbers.

Forgetting what the sample was like. Exercise, fever and diuretics are all on the list of ordinary causes, and so is concentrated urine — which is what going short of fluid produces.

Treating hyaline casts like granular casts. They are different findings. Granular casts are the ones in the published scoring systems.

Reading the count instead of the urinalysis. Protein, blood, white cells and the other cast types are all on the same report.

Questions your doctor may ask

Had you exercised hard, had a fever, or gone without much to drink before the sample? Are you taking a diuretic or any new medication? What else showed up on the urinalysis — protein, blood, white cells, other casts? What was the specific gravity? Have you had a urinalysis before, and what did it show? Do you have swelling, changes in how much you pass, or any symptoms at all? And what would change in your care depending on the answer?

Read together with

Protein in urine is measured on the same urinalysis and is among the findings a clinician weighs alongside a cast count.

Specific gravity describes how concentrated the sample was — one of the main reasons a hyaline count rises.

Granular casts are the cast type the published urine-microscopy scores actually use.

Creatinine and eGFR are where kidney function itself is measured; a cast count is not a measure of function.

Clinical pearls

May be printed as "UA Hyaline Casts/LPF, Qn"; LOINC 5796-8, scale Qn, method Microscopy.light.LPF.

StatPearls: normal up to 5 casts/LPF; a few hyaline or finely granular casts may be seen under normal physiological conditions.

Listed by StatPearls as a normal finding in concentrated urine, fever, exercise and diuretics — and also in pyelonephritis and chronic renal disease.

Composed of Tamm-Horsfall protein set in the shape of the tubule lumen.

The Perazella 2008 and 2010 urine-microscopy scores use granular casts and renal tubular epithelial cells; hyaline casts are in neither.

The 2008 study recorded hyaline casts in its data collection and presented no hyaline-specific results.

Ishida 2024 grouped counts as <10, 10–29, 30–99 and ≥100 per whole field in people with no dipstick protein: no significant trend across groups, a significant hazard ratio at the 10/WF cut-off only, single center, authors call for validation.

Whole-field counts do not convert to casts/LPF; the research thresholds are not patient cut-offs.

LPF and HPF are different fields: StatPearls counts hyaline per LPF, the 2008 study counted casts per HPF.

Clinical Takeaway

A quantitative count of hyaline casts in urine sediment, reported per low-power field (LOINC 5796-8). A low count is a normal finding — StatPearls gives the normal range as up to 5 casts/LPF and lists concentrated urine, fever, exercise and diuretics among ordinary causes, alongside pyelonephritis and chronic renal disease. Hyaline casts are not in the acute-kidney-injury severity scores: the Perazella systems of 2008 and 2010 assign points to granular casts and renal tubular epithelial cells, and the 2008 study recorded hyaline casts but presented no hyaline-specific results. Counts have been examined against outcomes with mixed results — Ishida 2024, in people with no dipstick protein, found no significant trend across count groups and a significant hazard ratio at a single cut-off of 10 per whole field, from one center and awaiting validation. Those are whole-field counts and do not convert to casts/LPF. Counting convention matters — StatPearls reports per low-power field while the 2008 study counted per high-power field, so the same sediment yields different numbers. A count above a laboratory's range is a prompt to look at the rest of the urinalysis, particularly protein and specific gravity, rather than a finding that stands on its own.

In one sentence

A count of clear protein casts in urine sediment — normal up to 5 per low-power field by one standard reference, raised by ordinary things like exercise and concentrated urine, and absent from the two cited acute-kidney-injury scores.

Bottom line

If your hyaline cast count is low, that is a normal finding. If it is above the range printed beside it, the useful questions are what counting method your laboratory used and what else the urinalysis showed — because hyaline casts are absent from the two cited acute-kidney-injury scores, and the cited 2024 study found no significant trend across its count groups. Consider what the sample was like, too: concentrated urine, fever, exercise and diuretics are all ordinary reasons for the count to rise. Either way the result belongs with the rest of the urinalysis and the clinician who ordered it.

FAQ about Hyaline Cast

What does it mean if my hyaline casts are high?

It means the count is above the reference range used with your result, which is less alarming than it sounds for this particular finding. StatPearls gives the normal range as up to 5 hyaline casts per low-power field, and lists concentrated urine, fever, exercise and diuretics as ordinary reasons for the number to rise. Above that figure, hyaline casts are not part of the scoring systems used to grade acute kidney injury, which are built on granular casts and renal tubular epithelial cells instead. Counts have been studied against kidney outcomes and the results are mixed, in whole-field units that do not convert to the per-low-power-field count on your report. So being above the range is a prompt to look at the rest of the urinalysis, particularly protein and specific gravity, rather than a measure of how much is wrong. Take it to the clinician who ordered the test.
Is 0-5 hyaline casts in urine normal?

By the figure StatPearls gives, yes: it states the normal range as up to 5 casts per low-power field, and says only a few hyaline casts may be seen under normal physiological conditions. The figure is not the same everywhere, though, and the range printed beside your own result may be narrower — some laboratories and platforms use a tighter figure, which means a count of 2 to 5 can be flagged as out of range even though a standard reference calls it normal. If your result sits in that gap, that is worth raising with whoever ordered the test. It is also worth checking whether your report counts per low-power field or high-power field, because the two are different areas and the same sediment gives different numbers.
What does a hyaline cast count of 6-10, or 10-20, mean?

It means your count is above the figure StatPearls gives as normal — up to 5 casts per low-power field. Beyond that, none of the sources cited on this page turns those particular bands into grades of severity. Hyaline casts are not in the urine-microscopy scoring systems used for acute kidney injury, which assign points to granular casts and renal tubular epithelial cells instead. Counts have been examined against kidney outcomes: a 2024 study of people with no dipstick protein grouped them as fewer than 10, 10–29, 30–99 and 100 or more per whole field, found no significant trend across the groups, and saw a signal at the single 10-per-whole-field cut-off, from one center and awaiting confirmation. Those are whole-field counts, a different measurement from the per-low-power-field figure on your report, so they cannot be read onto it. What decides whether a raised count matters is the rest of the urinalysis and your clinical picture.
What causes hyaline casts in urine?

They form from Tamm-Horsfall protein, which the kidney tubules secrete and which can set into a cast shaped like the tubule it formed in. StatPearls describes a cast as a coagulum of the trapped contents of the tubule lumen together with that protein. Anything that concentrates the urine or slows flow through the tubules produces more of them, which is why StatPearls lists concentrated urine, fever, exercise and diuretics as normal causes. The same entry also lists pyelonephritis and chronic renal disease. That combination is the important part: the same finding appears in both ordinary and pathological states, which is precisely why the count on its own does not separate them.
Do hyaline casts mean kidney disease?

Not on their own. Hyaline casts are found in healthy people — StatPearls lists them as a normal finding in concentrated urine, fever, exercise and diuretics — and they are also found in kidney conditions. The two cited Perazella acute-kidney-injury scores do not include them. The published urine-microscopy scores used to tell kidney injuries apart are built on granular casts and renal tubular epithelial cells. If kidney function is the question, it is answered by other things: creatinine, eGFR, and the protein on the same urinalysis. A hyaline cast count is not a measure of kidney function and should not be read as one, in either direction.
What does "UA hyaline casts/LPF, Qn" mean on my report?

It is the full name of the test, written in lab shorthand. "UA" is urinalysis. "Hyaline casts" is what was counted. "LPF" means per low-power field — the area of the slide visible at low magnification, which is how this particular count is reported. "Qn" means quantitative, that is, reported as a number rather than as a category like "few" or "many". The matching LOINC term is 5796-8, "Hyaline casts [#/area] in Urine sediment by Microscopy low power field". Some laboratories report hyaline casts as a category instead of a number, under a different code, so a report that says "few" rather than giving a figure is not an error.
What is the difference between LPF and HPF for casts?

They are two different fields of view down the microscope. LPF is low-power field and HPF is high-power field; a high-power field covers a smaller area, so the same sediment examined under high power yields a smaller number. This matters when comparing results. StatPearls reports hyaline casts per low-power field, while the 2008 Perazella urine-microscopy study counted its casts per high-power field. If you are comparing your count against a figure you read somewhere, or against an older result from a different laboratory, check that both are using the same field before concluding anything changed. If your report does not say which it used, that is a question for the laboratory rather than something to assume.
Can exercise or dehydration raise hyaline casts?

Exercise, yes — it is named directly. StatPearls lists concentrated urine, fever, exercise and diuretics as conditions in which hyaline casts are a normal finding. Dehydration is not on that list by name, but concentrated urine is, and going short of fluid is one of the ordinary ways urine becomes concentrated. The mechanism is the same in each case: hyaline casts form from Tamm-Horsfall protein in the kidney tubules, and anything that concentrates urine or slows flow through the tubules produces more of them. So a sample given after a hard run, during a fever, or while taking a diuretic is a sample in which a higher count is expected, as is one given when urine was concentrated. If that describes the day you gave the sample, it is worth mentioning to the clinician, because it changes how the number reads.
How are hyaline casts different from granular casts?

Hyaline casts are the protein matrix alone — clear, with no cells or debris caught in them. Granular casts contain granules within that matrix. The 2008 Perazella study drew the line that way: granular casts are defined by granules contained within a cast matrix, hyaline casts by a cast matrix without cells, colourless. The practical difference is how established each is. Granular casts are in the published urine-microscopy scoring systems, with points assigned by how many are seen. Hyaline casts are in neither of those scores, and the research on their count against kidney outcomes is more recent and less settled. If your report shows both, the granular count is the one with the longer interpretive track record.

Lab Results Explained and Tracked

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What does it mean if your Hyaline Cast result is too high?

Your hyaline cast count is above the reference range used with this result. That is worth putting in context, because hyaline casts are among the weakest findings on a urinalysis.

A low count is a normal finding: StatPearls gives the normal range as up to 5 casts per low-power field, and lists concentrated urine, fever, exercise and diuretics as ordinary reasons for the count to rise. A sample given after hard exercise, during a fever, or while taking a diuretic is a sample in which more hyaline casts are expected, as is one given when the urine was concentrated — which is what going short of fluid produces.

Above that figure, the picture is unsettled rather than blank. Hyaline casts are not part of the urine-microscopy scoring systems used to grade acute kidney injury — those are built on granular casts and renal tubular epithelial cells. Counts have been studied against kidney outcomes: one 2024 study of people with no dipstick protein found no significant trend across count groups, and a signal at a single cut-off of 10 per whole field, from one center and awaiting confirmation. Whole-field counts are not the same measurement as the per-low-power-field count on your report, so that threshold cannot be read onto your number. A count of 6, or 12, is above a reference figure rather than a graded level of severity.

Two things are worth checking. First, whether your report counts per low-power field or high-power field, since these are different areas and give different numbers. Second, what else the urinalysis showed — protein and specific gravity in particular. Take the result to the clinician who ordered it, with the rest of the panel rather than this line on its own.

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What does it mean if your Hyaline Cast result is too low?

There is no such thing as too few hyaline casts. The normal range starts at zero, and finding none is an ordinary result that needs no explanation or follow-up.

If your result is flagged low, that is a quirk of how the range is stored rather than a finding about you. Hyaline casts are counted upward from zero: their absence is unremarkable, and no condition is identified by having fewer of them than expected.

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Hyaline Casts in Urine: What Your Count Means

At a Glance

How to read your result

What your count means

Why the count moves

LPF and HPF: why the same number can mean two things

If you remember only one thing

Two people, same result

What this result cannot tell you

Common interpretation mistakes

Questions your doctor may ask

Read together with

Clinical pearls

Clinical Takeaway

In one sentence

Bottom line

FAQ about Hyaline Cast

What does it mean if my hyaline casts are high?

Is 0-5 hyaline casts in urine normal?

What does a hyaline cast count of 6-10, or 10-20, mean?

What causes hyaline casts in urine?

Do hyaline casts mean kidney disease?

What does "UA hyaline casts/LPF, Qn" mean on my report?

What is the difference between LPF and HPF for casts?

Can exercise or dehydration raise hyaline casts?

How are hyaline casts different from granular casts?

All Your Lab Results. One Simple Dashboard.

What does it mean if your Hyaline Cast result is too high?

All Your Lab Results. One Simple Dashboard.

Import, Track, and Share Your Lab Results Easily

Import, Track, and Share Your Lab Results

What does it mean if your Hyaline Cast result is too low?

Related Biomarkers

Article Review & Sources

Bring All Your Lab Results Together — In One Place

Gather Your Lab History — and Finally Make Sense of It

Finally, Your Lab Results Organized and Clear

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What's included in a Healthmatters membership

Import Lab Results from Any Source

See Your Health Timeline

Understand What Your Results Mean

Enter Your Lab Reports Yourself — Always Free Enter Your Lab Reports — Always Free

Visualize Your Results

Export Your Complete Lab History in a Single File Export Your Complete Lab History

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Securely Share With Anyone You Trust

Let Your Lab Results Tell the Full Story

Once your results are in one place, see the bigger picture — track trends over time, compare data side by side, export your full history, and share securely with anyone you trust.

Bring all your results together to compare, track progress, export your history, and share securely.

What Healthmatters Members Are Saying

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We implement proven measures to keep your data safe.

All Your Lab Results.
One Simple Dashboard.

All Your Lab Results.
One Simple Dashboard.