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Ferritin (Blood)
This test measures how much iron is in your blood. Too much or too little iron can cause health problems.
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Fetal Fibronectin
This test measures the amount of a protein made during pregnancy. It can help your doctor know if you are at risk for premature delivery.
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Fluphenazine Drug Level (Blood)
This test measures the amount of fluphenazine in your blood. This medicine is used to treat schizophrenia and Tourette's syndrome.
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Folate
This test measures the amount of folate in either your serum or your red blood cells.
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Follicle-Stimulating Hormone
This test measures the level of follicle-stimulating hormone (FSH), an important hormone made in your pituitary gland.
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Fragile X Syndrome (Amniotic Fluid)
This test checks a sample of your amniotic fluid during pregnancy to find out if your baby may have fragile X syndrome, a rare genetic disorder.
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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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