General

Order this test if you can't lose weight no matter what you do. Or if you seem not to be able to gain weight.

One or more of these tests may be ordered when symptoms suspicious of a liver condition are noticed. These include: jaundice, dark urine, or light-colored bowel movements; nausea, vomiting and/or diarrhea; loss of appetite; vomiting of blood; bloody or black bowel movements; swelling or pain in the belly; unusual weight change; or fatigue or loss of stamina.

Mononucleosis: Infection with the Epstein-Barr virus (EBV, human herpesvirus 4, HHV-4) in which there is an increase of white blood cells that have a single nucleus (monocytes).

The main use of the FOBT is to screen for early colon cancer.

To determine whether your potassium concentration is within normal limits and to help evaluate an electrolyte imbalance; to monitor chronic or acute hyperkalemia or hypokalemia.

To confirm and monitor pregnancy

To check how well blood-thinning medications (anti-coagulants) are working to prevent blood clots

To check how well blood-thinning medications (anti-coagulants) are working and As part of an investigation of a bleeding or thrombotic episode

Test used in evaluating thyroid function and metabolism. If you can't lose or gain weight you may want to order this test.

To help diagnose hyperthyroidism.