Lab report names starting with L

Abbreviations

• LacLactate (Lactic Acid)A byproduct of making energy that rises when cells are short of oxygen or the body can't clear it. Higher levels can be a sign the body is under strain.
• Lambda FLCFree Lambda Light Chains, SerumA small antibody piece (lambda type) made by plasma cells. It is read with kappa, the ratio and your kidney function.
• Large HDL-PLarge HDL Particle NumberThe number of large HDL particles in your blood. Labs mainly use it as one input to an insulin-resistance score, not as a stand-alone heart test.
• Large VLDL-PLarge VLDL Particle NumberThe number of large, triglyceride-rich VLDL particles in your blood. It tends to follow your triglycerides and is a main input to the LP-IR score.
• LDLactate Dehydrogenase (LDH)An enzyme found in almost every tissue. A higher level can be a general sign of cell or tissue damage, and it does not point to one condition.
• LDHLactate Dehydrogenase (LDH)An enzyme found in almost every tissue. A higher level can be a general sign of cell or tissue damage, and it does not point to one condition.
• LDLLDL CholesterolThe cholesterol carried in LDL particles, which can build up in artery walls. It is the main cholesterol number used to estimate heart and blood vessel risk.
• LDL-CLDL CholesterolThe cholesterol carried in LDL particles, which can build up in artery walls. It is the main cholesterol number used to estimate heart and blood vessel risk.
• LDL-C/HDL-CLDL / HDL RatioYour LDL cholesterol divided by your HDL cholesterol. Some labs print it as one number that compares the 'bad' and 'good' cholesterol you carry.
• LDL-cholLDL CholesterolThe cholesterol carried in LDL particles, which can build up in artery walls. It is the main cholesterol number used to estimate heart and blood vessel risk.
• LDL-PLDL Particle Number (LDL-P)The number of LDL particles in your blood. Some clinicians use it next to LDL cholesterol to see how many cholesterol-carrying particles you have.
• LDL/HDLLDL / HDL RatioYour LDL cholesterol divided by your HDL cholesterol. Some labs print it as one number that compares the 'bad' and 'good' cholesterol you carry.
• LEUrine Leukocyte Esterase (Dipstick)A dipstick check for an enzyme from white blood cells. A positive result can be a sign of inflammation in the urinary tract, such as a UTI.
• LEUUrine Leukocyte Esterase (Dipstick)A dipstick check for an enzyme from white blood cells. A positive result can be a sign of inflammation in the urinary tract, such as a UTI.
• LEVLevetiracetamMeasures the level of levetiracetam, an anti-seizure medicine, in your blood to check it is being absorbed and cleared as expected.
• LHLuteinizing Hormone (LH)A pituitary hormone that triggers ovulation in women and tells the testes to make testosterone in men. It surges mid-cycle.
• LiLithiumMeasures how much lithium, a mood-stabilizing medicine, is in your blood so your care team can keep it in a range that works and is safe.
• LIPLipaseAn enzyme from the pancreas that helps digest fat. It is checked in the blood when belly pain may involve the pancreas, and it is more specific than amylase.
• LNSCCortisol, Late-Night SalivaCortisol in a saliva sample taken near bedtime, when levels are normally at their lowest. It shows whether the daily cortisol rhythm dips as expected at night.
• Lp-PLA2Lp-PLA2 ActivityHow active an enzyme is that travels mostly on LDL particles and is found in artery plaque. Higher activity is linked to higher heart risk, but it is an add-on test.
• Lp(a)Lipoprotein(a), mass (mg/dL)A cholesterol-carrying particle like LDL with an extra protein attached. Your level is mostly set by your genes and stays fairly steady through life.
• Lp(a)Lipoprotein(a), molar (nmol/L)A cholesterol-carrying particle like LDL with an extra protein attached, counted in nmol/L. Your level is mostly set by your genes and stays fairly steady.
• LTGLamotrigineMeasures the level of lamotrigine, a seizure and mood medicine, in your blood to check it is being absorbed and cleared as expected.
• LYM#Lymphocytes (Absolute)The actual number of lymphocytes, immune cells that help fight viruses and remember germs, in a given amount of blood.
• LYM%Lymphocytes (Percent)The share of your white blood cells that are lymphocytes, immune cells that help fight viruses, shown as a percent.
• Lyme AbLyme Disease Antibody (Screen)A first-step blood test for antibodies to the bacteria that cause Lyme disease. A positive or equivocal result is followed by a second test.
• Lyme EIALyme Disease Antibody (Screen)A first-step blood test for antibodies to the bacteria that cause Lyme disease. A positive or equivocal result is followed by a second test.
• Lyme IgG WBLyme Disease Western Blot (IgG and IgM Bands)A blood test that checks which Lyme bacteria proteins your antibodies react to. It is the second step after a positive or equivocal antibody screen.
• Lyme IgM WBLyme Disease Western Blot (IgG and IgM Bands)A blood test that checks which Lyme bacteria proteins your antibodies react to. It is the second step after a positive or equivocal antibody screen.
• Lyme WBLyme Disease Western Blot (IgG and IgM Bands)A blood test that checks which Lyme bacteria proteins your antibodies react to. It is the second step after a positive or equivocal antibody screen.
• Lymph#Lymphocytes (Absolute)The actual number of lymphocytes, immune cells that help fight viruses and remember germs, in a given amount of blood.
• Lymph%Lymphocytes (Percent)The share of your white blood cells that are lymphocytes, immune cells that help fight viruses, shown as a percent.