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Prothrombin time (PT) is a blood test that measures how long it takes blood to clot. A prothrombin time test can be used to check

Partial thromboplastin time (PTT) is a blood test that measures the time it takes your blood to clot. A PTT test can be used to

A renin assay blood test is done to find the cause of high blood pressure (hypertension). Renin is an enzyme made by special cells

An aspartate aminotransferase (AST) test measures the amount of this enzyme in the blood. AST is normally found in red blood cells

A reticulocyte count is a blood test that measures how fast red blood cells called reticulocytes are made by the bone marrow and

Discusses serum osmolality test used to check for dehydration, certain poisons, cause of seizures, and other problems. Covers how

A sodium test checks how much sodium is in the blood. Sodium is both an electrolyte and mineral. It helps keep the water (the

A tuberculin skin test (also called a Mantoux tuberculin test) is done to see if you have ever been exposed to tuberculosis (TB)

A fallopian tube blockage often prevents successful passage of the egg to the sperm, or the fertilized egg to the uterus. Surgery

Looks at infertility. Includes info on various tests used to find out why someone can't get pregnant. Covers treatments, including