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Why does the doctor need a 24-hour urine sample if a random sample has already been tested?

April 26, 2017doctor sample tested urine

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Why does the doctor need a 24-hour urine sample if a random sample has already been tested?

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The rate of production and excretion of the porphyrins may vary and may or may not be elevated in a random sample. A 24-hour urine sample allows the evaluation of all of the porphyrin that is excreted in a 24-hour period.