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Factor XI
This test measures the amount of factor XI in your blood. Factor XI is a substance that plays an important role in blood clotting.
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Factor XII
This test measures the amount of a protein called coagulation factor XII in your blood. Factor XII is one of several clotting factors.
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Fecal Fat
This test measures the amount of fat in your stool. Having too much fat in your stool may mean that you have malabsorption.
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Fecal Occult Blood Test (Guaiac-Based)
A fecal occult blood test checks a stool sample for blood that can't be seen with the naked eye. Blood in the stool is a sign of bleeding in the digestive tract.
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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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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.
Learn More Fragile X Syndrome (Amniotic Fluid)
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