urine sodium test

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urine sodium test (Na⁺),

a 24-hour urine test that evaluates sodium balance in the body by determining the amount of sodium excreted in urine during a 24-hour period. It is useful for evaluating patients with volume depletion, acute renal failure, adrenal disturbances, and acid-base imbalances. It is especially important when the serum sodium concentration is low.

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