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Free Androgen Index
This test is used to find out if your levels of the hormone androgen are normal. The levels are different depending on your sex.
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Free T4
This test measures the level of free T4 in your blood. It helps your health care provider know how well your thyroid is working.
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Glucose-6-Phosphate Dehydrogenase
This test finds out if you have low levels of a particular enzyme that can cause hemolytic anemia.
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Galactosemia
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.
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Gamma-Glutamyl Transpeptidase
This test looks for an enzyme called gamma-glutamyl transpeptidase in your blood. The test can help find out whether you have liver damage.
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Gastrin
This test measures the amount of the hormone gastrin in your blood. You may need this test if you have recurrent peptic ulcers.
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Giardia Antigen (Stool)
This is a stool sample test to look for the parasite Giardia intestinalis. The parasite causes an infection of the small bowel.
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Glomerular Filtration Rate
This test looks for changes in how well your kidneys are working. This is especially important if you have diabetes or high blood pressure.
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Glucose (Blood)
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.
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