The Activated partial thromboplastin time (aPTT) test tells you how many seconds (s) it takes your blood to form a clot after body tissue(s) or blood vessel walls were injured. Normally, when one of your blood vessels is damaged, proteins in your blood called clotting factors come together in a certain order to form blood clots and quickly stop bleeding. The aPTT test can be used to look at how well those clotting factors are working. It’s often used with other tests that monitor clotting factors.
Difference between the PTT and aPTT tests:
They both measure the same thing, however, in aPTT, an activator is added that speeds up the clotting time and results in a narrower reference range. The aPTT is considered a more sensitive version of the PTT and is used to monitor the patient’s response to heparin therapy.
Some reason to take this test:
- To check for a bleeding disorder like hemophilia or von Willebrand disease.
- If you get heparin therapy.
- Check that your blood clots normally before you go in for surgery
- Look for a problem with your immune system (some immune system conditions make clots more likely to form — in women, that can also lead to miscarriages)
- See how well your liver’s working, since it makes the clotting factors
Symptoms of bleeding disorders:
- Bleeding or bruising easily
- Blood clots that form when they shouldn’t
- Blood in your poop or urine
- Gums that bleed easily
- Heavy menstrual periods in women
- Nosebleeds
- Swelling or pain in your joints
Normal Ranges:
Test results are measured in seconds of time. Your results will show how long your blood took to clot, and will often compare them with results from a normal sample tested at the same time. What’s normal varies with different labs, so check with your doctor to help you understand what your numbers mean.
- A typical aPTT value is 30 to 40 seconds. If you get the test because you’re taking heparin, you’d want your aPTT results to be more like 60 to 80 seconds.
The APTT is frequently performed as part of a series of screening tests that comprise the PT, APTT and often the thrombin time and an estimation of the fibrinogen concentration.
Interfering factors:
It’s important to rule out interfering factors of an abnormal aPTT before undertaking a more detailed investigation:
- unfractionated heparin in a central venous or arterial catheter can prolong aPTT.
- A high hematocrit value will give falsely prolonged aPTT. This is due to the increased concentration of citrate relative to the small volume of plasma.
References:
- Clinical and Laboratory Standards Institute (CLSI). One-stage PT and APTT test; Approved Guideline Second Edition. H47-A2, 2008
- Greaves M, Preston FE: Approach to the bleeding patient. In Hemostasis and Thrombosis: Basic Principles and Clinical Practice. Fourth edition. Edited by RW Colman, J Hirsh, VJ Marder, et al. Philadelphia, JB Lippincott Co, 2001, pp 1197-1234
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Prolongation of the activated partial thromboplastin time (aPTT) can occur as a result of:
- deficiency of one or more coagulation factors (acquired or congenital in origin), or
- the presence of an inhibitor of coagulation such as heparin,
- a lupus anticoagulant,
- a nonspecific inhibitor such as a monoclonal immunoglobulin, or
- a specific coagulation factor inhibitor.
- Prolonged clotting times may also be observed in cases of fibrinogen deficiency, liver disease, and vitamin K deficiency.
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Shortening of the aPTT usually reflects either elevation of factor VIII activity in vivo that most often occurs in association with acute or chronic illness or inflammation, or spurious results associated with either difficult venipuncture and specimen collection or suboptimal specimen processing.
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14.3.3 ETA PROTEIN, Acetylcholine Receptor (AChR) Antibody, Activated partial thromboplastin time (APTT), Alpha 2-Macroglobulins, Qn, Alpha Melanocyte Stimulating Hormone, ANA SCREEN A, ANA SCREEN B, ANA SCREEN, IFA, ANA Screen, IFA (Positive, Negative), ANA titer, Anti-C1Q Ab, IgG (RDL), Anti-DBL-Strand DNA Ab, Anti-dsDNA (Double-stranded) Ab by Farr method (RDL), Anti-dsDNA ab (Farr Assay), Anti-Smith Antibody, Anticardiolipin Ab, IgM, Anticardiolipin Ab,IgA,Qn, Anticardiolipin Ab,IgG,Qn, Antinuclear Antibodies (ANA) Screen, Reflex ANA IFA dsDNA Antibodies, Antinuclear Antibodies Direct (ANA Direct), Antiphosphatidylserine IgA, Antiphosphatidylserine IgG, Antiphosphatidylserine IgM, Baski sleepy, C1 Esterase Inhibitor, Func, C1 Esterase Inhibitor, Serum, C3A Desarg Fragment, C4a Level by RIA, CARDIOLIPIN AB (IGA), CARDIOLIPIN AB (IGG), CARDIOLIPIN AB (IGM), Carnitine Esters, Carnitine, Free, Carnitine, Total, CCP Antibodies IgG/IgA, Centromere, Chromatin, Coccidioides Ab by CF, Coccidioides Ab, IgG, EIA, Coccidioides Ab, IgM, EIA, Complement C1q, Quantitative, Complement C3, Complement C3a, Complement C4, Serum, Complement C4a, Complement Component C1Q, Complement, Total (CH50), Complement, Total (CH50) / Quest, Cyclic Citrullinated Peptide Antibody, Dilute Russell's viper venom time (dRVVT), Diphtheria Antitoxoid Antibody, DNA AB Double Stranded Titer, DNA Double-Stranded Ab, IgG, DRVVT SCREEN, ds-DNA Antibody, IgG, dsDNA, ENA to Smith (Sm) Antibody, Eosinophil Cationic Protein (ECP), Erythrocyte Sedimentation Rate (ESR), Esterified/Free Ratio, F004-IgE Wheat, Free Kappa Lt Chains, Serum, Free Lambda Lt Chains, Serum, Gastrin, GlycA, Hemoglobin A2 (Quant), HISTAMINE RELEASE (CHRONIC URTICARIA), Histamine, Plasma, Histone, HLA-B27 (Human Leukocyte Antigen B27), Human Transforming Growth Factor Beta 1 (TGF-b1), IGE ANTIBODY (ANTI IGE IGG), Immature Grans (Abs), Immature Granulocytes (%), Immunofixation Result, Serum, Immunoglobulin A, Qn, Serum, Immunoglobulin D, Quant, Serum, IMMUNOGLOBULIN E, Immunoglobulin E, Total, Immunoglobulin G, Qn, Serum, Immunoglobulin M, Qn, Serum, Influenza Type A Antibody Serum, Influenza Type B Antibody Serum, Interleukin-2, Serum, Interleukin-6, Jo 1 Antibodies, IgG, Serum, JO-1, Kappa/Lambda Ratio, Serum, Liver Kidney Mic IgG, Liver-Kidney Microsomal Antibodies, Lupus Anticoagulant, Measles Antibodies, IgG, Mumps Abs, IgG, PEP A2Glob, PHOSPHATIDYLETHANOLAMINE AB (IGA), PHOSPHATIDYLETHANOLAMINE AB (IGG), PHOSPHATIDYLETHANOLAMINE AB (IGM), PHOSPHATIDYLSERINE AB (IGA), PHOSPHATIDYLSERINE AB (IGG), PHOSPHATIDYLSERINE AB (IGM), Plasminogen Activator Inhibitor (PAI-1) AG, Procalcitonin, Prothrombin Fragment 1.2, Prothrombin Time (PT), Prothrombin Time (PT) INR, RA Latex Turbid, Reptilase Clotting Time, RF, IgA by EIA (RDL), RF, IgG by EIA (RDL), RF, IgM by EIA (RDL), Rheumatoid factor (RF), RNA Polymerase III Antibodies, RNP/Sm, Scl-70, SICKLE CELL SCRN, Sirolimus, Whole Blood, Sm, SM/RNP Antibody, Smith/RNP (ENA) Ab, IGG, Smooth Muscle Abs, IFA, SSA, SSB, ssDNA, Tacrolimus, Whole Blood, Tetanus Antitoxoid IgG Ab, TGF-b1, Thrombin time, Thrombin-Antithrombin TAT, Trans. Growth Fact. beta 1, Transforming Growth Factor beta, Plasma, Tryptase, Tumor Necrosis Factor, Varicella-Zoster Virus (VZV) DNA, Qualitative, Real-Time PCR, VEGF, Plasma, Von Willebrand Factor Antigen (vWF), vWF Activity
