Very small amounts of radioactive substances may be administered to patients, and subsequently, their body fluids and glands may be examined in the laboratory for concentrations of radioactivity. Minute quantities of radioactive materials may be detected in blood, feces, urine, other body fluids, and glands.
Some procedures check the ability of the body to absorb the administered radioactive compound. Others, such as blood volume determinations, test the ability of the body to localize or dilute the administered radioactive substance.
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