Biomarkers: explore one system at a time

Showing 721–740 of 1204 results

• Leptin A hormone released by fat cells that helps regulate appetite and energy balance. Levels generally rise with increased body fat.
• Lettuce (f215) IgE Measures IgE antibodies to lettuce to check for allergic sensitization that may explain reactions after eating or handling lettuce.
• Lettuce (f215) IgG4 Measures IgG4 antibodies to lettuce, which reflect exposure to lettuce in your diet; their link to food-related symptoms is debated.
• Leukocyte Esterase Detects leukocyte esterase, an enzyme released by white blood cells, in urine, used as a sign of white cells that can point to a urinary tract infection.
• Leukocytes Checks a stool sample for white blood cells, which can point to inflammation of the bowel lining, for example from invasive infections or inflammatory bowel disease.
• Leukotriene E4, 24 Hour Measures leukotriene E4 in a 24-hour urine collection, a marker of inflammatory leukotriene production used mainly to help evaluate mast cell disorders.
• Leukotriene E4, Random Measures leukotriene E4 in a random urine sample, a marker of inflammatory leukotriene production used mainly to help evaluate mast cell activation.
• Lima Bean (f182) IgE Measures IgE antibodies to lima beans to check for allergic sensitization that may explain reactions after eating lima beans or other legumes.
• Lime (f306) IgE Measures IgE antibodies to lime to check for allergic sensitization that may explain reactions after eating lime or citrus products.
• Linoleic Acid Linoleic acid, the main omega-6 essential fatty acid, measured in whole blood as part of OmegaCheck to look at your dietary fat balance.
• Linoleic C18:2W6 Linoleic acid (C18:2 omega-6), the main omega-6 essential fatty acid, measured in serum fatty acid panels to look at your essential fatty acid status.
• Lipase An enzyme that helps digest fat, produced mainly by the pancreas. Elevated levels are a key marker for pancreatitis.
• Lipoprotein-Associated Phospholipase A2Lp-PLA2 Measures an enzyme linked to inflammation within artery walls, used as an additional marker to help assess cardiovascular risk.
• Lithium Measures blood levels of the medication lithium, used to keep dosing in a safe and effective range for people being treated with it.
• Liver Isoenzymes The liver fraction of alkaline phosphatase, measured in serum to help work out whether a raised alkaline phosphatase comes from the liver or bile ducts.
• Lobster (f80) IgE Measures IgE antibodies to lobster to check for allergic sensitization that may explain reactions after eating lobster or other shellfish.
• Lobster (f80) IgG4 Measures IgG4 antibodies to lobster, which reflect exposure to lobster in your diet; their link to food-related symptoms is debated.
• Lobster, Spiny (f304) IgE Measures IgE antibodies to spiny lobster to check for allergic sensitization that may explain reactions after eating spiny lobster or other shellfish.
• Low-Density Lipoprotein (LDL) CholesterolLDL The 'bad' cholesterol that can build up in artery walls. A core marker used to assess cardiovascular disease risk.
• LP-IR Score Lipoprotein Insulin Resistance Score — a composite score derived from lipoprotein particle measurements that estimates insulin resistance.