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Theophylline
This test measures the level of the medicine theophylline in your blood. Having too much of this medicine in your body can be life-threatening.
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Thyroid Antibody
This test measures the amount of thyroid antibodies in your blood. The test can help find out whether you have a problem with your thyroid.
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Thyroid-Stimulating Hormone
This test measures your level of TSH, a hormone made by your pituitary gland. You may need this test if you have symptoms of thyroid problems.
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Tricyclic Antidepressant Screen
This test is used to check a sample of blood or urine for tricyclic antidepressants. Although these medicines can be helpful in normal doses, taking too much can be fatal.
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Triglycerides
This test measures the amount of triglycerides in your blood. This test is part of a group of cholesterol and blood fat tests called a fasting lipoprotein panel, or lipid panel.
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Trypsin/Chymotrypsin (Stool)
This test looks for two enzymes from the pancreas, to find out how well the pancreas is working. This test is used for people with cystic fibrosis.
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Uniparental Disomy
This test is used to see if a child has certain chromosome changes.
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Blood Urea Nitrogen
This test measures the amount of urea nitrogen in your blood. It can help your doctor find out if you have kidney disease or another kidney disorder.
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Urea Nitrogen Clearance (Urine)
This test measures the amount of urea nitrogen in your urine. The test can help diagnose kidney problems.
Learn More Urea Nitrogen Clearance (Urine)
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