Essay on lab values

822 WordsSep 30, 20134 Pages
Magnesium: Normal Ranges: 1.7 to 2.2 mg/dL A magnesium test is used to measure the level of magnesium in the blood. Abnormal levels of magnesium are most frequently seen in conditions or diseases that cause impaired or excessive excretion of magnesium by the kidneys or that cause impaired absorption in the intestines. Magnesium levels may be checked as part of an evaluation of the severity of kidney problems and/or of uncontrolled diabetes and may help in the diagnosis of gastrointestinal disorders. Since a low magnesium level can, over time, cause persistently low calcium and potassium levels, it may be checked to help diagnose problems with calcium, potassium, phosphorus, and/or parathyroid hormone – another component of calcium…show more content…
T4: Normal Ranges: 4.5 - 11.2 mcg/dL Total T4 and free T4 are two separate tests that can help a doctor evaluate thyroid function. The total T4 test has been used for many years to help diagnose hyperthyroidism and hypothyroidism. It is a useful test but can be affected by the amount of protein available in the blood to bind to the hormone. The free T4 test is a newer test that is not affected by protein levels. Since free T4 is the active form of thyroxine, the free T4 test is thought by many to be a more accurate reflection of thyroid hormone function and, in most cases, its use has replaced that of the total T4 test. Whichever thyroxine measurement is ordered, it is usually ordered along with or following a TSH test. This helps the doctor to determine whether the thyroid hormone feedback system is functioning as it should, and the results of the tests help to distinguish between different causes of hyperthyroidism and hypothyroidism. Sometimes a T3 test will also be ordered to give the doctor additional diagnostic information. A T4 and TSH test may be ordered to help evaluate a person with a goiter and to aid in the diagnosis of female infertility. If a doctor suspects that someone may

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