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Lab tests guide
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Lactate dehydrogenase measurement, cerebrospinal fluid
This test measures an enzyme called lactate dehydrogenase (LDH) in cerebrospinal fluid. It is used to help evaluate certain types of brain cell damage[1]. This test may be used ...
Lactic acid measurement
This test measures the amount of lactate (lactic acid) in blood[1]. This test may be done for suspected conditions such as hypoxia (lack of blood and oxygen) to an infant[2][3],...
Lactose tolerance test
This test measures glucose (sugar) levels in blood. This test is done after a period of fasting followed by drinking a fixed amount of lactose (milk sugar). It is used to help d...
Lead measurement, quantitative, blood
This test measures the amount of lead in blood. It is used to diagnose lead poisoning or monitor lead exposure[1].
Lead mobilization test
This test measures the level of lead (a toxic metal) in urine. This test is used to evaluate and manage suspected lead poisoning[1][2][3][4][5][6][7].
Lead screening, urine
This test measures the level of lead (a toxic metal) in urine. It is used to evaluate and manage lead poisoning[1][2][3].
Legionella immunofluorescence
This test detects species of a bacteria called Legionella in respiratory tract secretions. It is used to help diagnose Legionnaire's disease, an infection caused by this bacteri...
Legionella species culture
This test detects the presence of a bacteria called Legionella pneumophila. A sample of body fluid or tissue[1] such as respiratory tract secretions, sputum[2][3], lung tissue[3...
Legionella urine antigen
This test detects the antigen to a species of bacteria called Legionella in urine [1]. It is used to help diagnose an infection caused by this bacteria[2][3][4][1][5][6][7][8].
Leishmaniasis screening
This test detects antigens and antibodies to Leishmania (a type of parasite) in blood. Antigens and antibodies are involved in the body's immune response. This test is used to h...
Leptospira species culture, Blood, Urine, Cerebrospinal fluid
This test detects and isolates a type of bacteria called Leptospira from blood, urine, and cerebrospinal fluid. It is used to help diagnose and treat suspected leptospirosis, wh...
Lipid profile
Laboratory panels (a set of tests) are done for many reasons. Panels may be performed for routine health screenings or if a disease or toxicity is suspected. Panels may be used ...
Lipoprotein associated phospholipase A2 measurement
This test measures the amount of an enzyme called lipoprotein-associated phospholipase A2 in blood. It is used to help predict a heart attack or stroke. It is also used to help ...
Lipoprotein-associated phospholipase A2 measurement
This test measures the amount of an enzyme called lipoprotein-associated phospholipase A2 in blood. It is used to help predict a cardiac event or stroke. It is also used to help...
Lymphocyte count
This test measures the number of lymphocytes (a type of white blood cell) in blood. It is used to evaluate and manage disorders of the blood or the immune system. It is also use...
Lysergic acid diethylamide measurement
This test measures lysergic acid diethylamide (LSD) and its metabolites in urine. LSD is a type of drug called a hallucinogen. This test is used when hallucinogen abuse is suspe...