This test is used to screen for prediabetes or diabetes. For the test, you drink a sweet beverage and then have your blood drawn several times over the next few hours.

This test measures the amount of glucose in the fluid that surrounds your brain and spinal cord. If you have a serious infection, your glucose level may be lower than normal.

A blood glucose test tells you whether your level of glucose is within a healthy range. Fasting plasma glucose is a common test for diagnosing diabetes.

This test looks for changes in how well your kidneys are working. This is especially important if you have diabetes or high blood pressure.

This is a stool sample test to look for the parasite Giardia intestinalis, which causes an infection of the small bowel called giardiasis or travelers' diarrhea.

This test measures the amount of the hormone gastrin in your blood. You may need this test if you have recurrent peptic ulcers.

This test looks for an enzyme called gamma-glutamyl transpeptidase in your blood. The test can help find out whether you have liver damage.

This test looks for enzyme activity in the red blood cells in your child's blood. It can help diagnose galactosemia, a rare inherited disorder.

This test checks for a deficiency in a protein in the blood known as Factor X. This protein helps with clotting.

This test helps find out whether you have hemophilia A or another clotting disorder.