Find the right blood test for you.

Measures lactate dehydrogenase, an enzyme present in most tissues that is released when cells are damaged. A general marker rather than one specific to any organ. View details →

Measures LDL cholesterol directly rather than calculating it. Useful when triglycerides are high or the sample was not fasting, situations where the usual calculation is unreliable. View details →

Measures the amount of lead in your blood. Lead exposure can come from old paint, older plumbing, contaminated soil, and some jobs and hobbies, and it often causes no noticeable symptoms. View details →

Measures leptin, a hormone released by fat tissue that signals energy stores to the brain. Used mainly in specialist assessment of appetite and weight regulation. View details →

Measures luteinizing hormone, the pituitary hormone that triggers ovulation and stimulates testosterone production. Can help assess fertility and menstrual cycle problems. View details →

Measures lipase, an enzyme the pancreas makes to digest fat. More specific to the pancreas than amylase, and the preferred test for assessing pancreatitis. View details →

Measures lipoprotein(a), an LDL-like particle whose level is largely inherited. Raised Lp(a) is an independent cardiovascular risk factor not reflected in a standard lipid panel. View details →

Measures the activity of Lp-PLA2, an enzyme associated with inflammation inside artery walls. Sometimes used to add detail to cardiovascular risk assessment. View details →

Measures magnesium in the blood. Magnesium is needed for muscle and nerve function, heart rhythm and hundreds of enzyme reactions throughout the body. View details →

Measures magnesium inside red blood cells rather than in serum. Reflects longer-term magnesium status, since most of the body's magnesium sits inside cells. View details →

Measures IgG antibodies to measles, which indicate immunity from past infection or vaccination. Commonly required for healthcare workers, students and travelers. View details →

Measures mercury in the blood, which mainly reflects recent exposure from eating fish. Can help assess exposure in people who eat large amounts of certain seafood. View details →