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Collection Instructions - 24 hour urine specimen
These tests are of value principally -
In differentiation of the cause of low plasma sodium
To differentiate btween pre-renal and renal failure in certain circumstances where oligouria is present (urine Na)
In acute disturbances of sodium and potassium homeostasis, as a guide to immediate therapy
To assess volume status
While a 24 hour urine collection is the gold standard, in some cases a spot urine may be an adequate alternative.
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