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Health Library

Potassium

This test measures the amount of potassium in your blood. It's often part of a routine blood test to check your level of electrolytes.
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Health Library

Free and Bound T4

This test measures the level of the hormone thyroxine (T4) in your blood. This test can show whether your thyroid gland is overactive (hyperthyroidism) or underactive (hypothyroidism).
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Health Library

What Is Plasma?

White blood cells, red blood cells, and platelets are essential to body function, but plasma also plays a crucial, and mostly unrecognized, job. It carries these blood components throughout the body as the fluid in which they travel.
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