Lactoferrin and Calprotectin are reliable markers for differentiating organic inflammation (IBD) from function symptoms (IBS) and for management of IBD. Monitoring levels of fecal lactoferrin and calprotectin can play an essential role in determining the effectiveness of therapy, are good predictors of IBD remission, and can indicate a low risk of relapse.

The Lambda marker on a Serum Immunofixation (IFE) panel helps detect abnormal lambda light chain production by plasma cells, which may indicate disorders such as multiple myeloma, MGUS, or light chain amyloidosis. Normally, the immune system produces a balanced mix of kappa and lambda light chains, but a sharp monoclonal lambda band suggests a clonal plasma cell disorder. This test is used alongside kappa and heavy chain markers to identify and characterize monoclonal proteins (M-proteins) in the blood, guiding diagnosis and further evaluation of possible blood cancers or related conditions.

The Lambda Light Chain, Free, Urine test is a critical diagnostic tool, prominently used in the field of medical diagnostics to identify and monitor various hematologic disorders, with a particular focus on multiple myeloma and other conditions related to plasma cell dyscrasias. This test specifically measures the concentration of free lambda light chains in the urine. Lambda light chains are protein fragments produced by plasma cells, a type of white blood cell integral to the immune system. An abnormal increase in the levels of lambda light chains in urine can be a key indicator of multiple myeloma, a cancer of plasma cells, or other related disorders such as light chain amyloidosis, where abnormal proteins accumulate in tissues.

Lamotrigine (Lamictal) is an anticonvulsant medication commonly used for the treatment of epilepsy and bipolar disorder. Measuring the serum concentration of Lamotrigine is crucial for ensuring therapeutic efficacy and safety. Labcorp's Lamotrigine (Lamictal), Serum test helps to monitor the drug levels in patients to ensure they are within the therapeutic range, thereby optimizing treatment and minimizing the risk of adverse effects.

High-density lipoproteins (HDL) comprise particles of different size, density and composition and their vasoprotective functions may differ.

In the cardiovascular field, both HDL cholesterol (HDL-C) concentration and HDL particle size are independently associated with cardiovascular risk. In particular, large HDL particles appear to be protective in coronary artery disease. HDL particle (HDL-P) number has been proposed as improved inverse predictor of CVD compared to plasma HDL-C.

Large unstained cells (LUC) are cells that are activated lymphocytes and peroxidase-negative cells. They are not stem cells, normal lymphocytes (white blood cells) or virocytes. They may indicate viral infections or inflammation.

Large unstained cells (LUC) are cells that are activated lymphocytes and peroxidase-negative cells. They are not stem cells, normal lymphocytes (white blood cells) or virocytes. They may indicate viral infections or inflammation.

What are Large VLDL Particles (Large VLDL-P)?

Large VLDL particles, also known as very-low-density lipoprotein particles, play a significant role in lipid metabolism and cardiovascular health. VLDL particles are primarily composed of triglycerides, which are a form of fat. They also contain cholesterol, fatty acids, and a protein called apolipoprotein B (apoB). High levels of apoB in the blood have been associated with an increased risk of cardiovascular disease. When there is an excessive production of VLDL particles or impaired clearance from the bloodstream, it can lead to elevated levels of VLDL cholesterol. High levels of VLDL cholesterol are considered detrimental to cardiovascular health, as they contribute to the development of atherosclerosis, which is the buildup of plaque in the arteries. Atherosclerosis can restrict blood flow and increase the risk of heart disease, heart attack, and stroke.

Lathosterol is a crucial marker measured in the Boston Heart Cholesterol Balance® test, providing valuable insights into cholesterol production within the body. As a precursor in the biosynthesis of cholesterol, lathosterol levels directly reflect the rate of endogenous cholesterol synthesis. Elevated levels of lathosterol indicate increased cholesterol production, which can be a critical factor in assessing cardiovascular disease risk. By quantifying lathosterol, the Boston Heart Cholesterol Balance® test offers a detailed understanding of an individual's cholesterol metabolism, enabling healthcare providers to tailor treatment strategies more effectively. This marker is instrumental in guiding decisions on therapeutic interventions such as statins, aimed at lowering cholesterol levels and improving overall cardiovascular health.

Lauric acid is a saturated fat and one of the medium chain fatty acids (MCFAs) together myristic and capric acid.

LCA and DCA are secondary bile acids. These secondary bile acids are associated with disease. An LCA:DCA ratio greater than 1 is associated with increased risk of gallstones, breast cancer, and colorectal cancer. 

LCA and DCA are secondary bile acids. These secondary bile acids are associated with disease. An LCA:DCA ratio greater than 1 is associated with increased risk of gallstones, breast cancer, and colorectal cancer. 

When illness or injury damages your cells, LDH may be released into the bloodstream, causing the level of LDH in your blood to rise.

LDH-1: heart and red blood cells

When illness or injury damages your cells, LDH may be released into the bloodstream, causing the level of LDH in your blood to rise.

LDH-2: heart and red blood cells

When illness or injury damages your cells, LDH may be released into the bloodstream, causing the level of LDH in your blood to rise.

LDH-3: lymph tissue, lungs, platelets, pancreas

When illness or injury damages your cells, LDH may be released into the bloodstream, causing the level of LDH in your blood to rise.

LDH-4: liver and skeletal muscle