Urine specimens that cannot be tested within 2 hours should be:

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Urine specimens that cannot be tested within 2 hours should be refrigerated to prevent bacterial growth and changes in the composition of the sample. Freezing can alter the cellular morphology and should be avoided unless specifically requested by the ordering physician. Recollecting the specimen is also an option, but not always convenient or feasible. Incubation is not relevant to preserving a urine specimen for testing.

Urine Specimens That Cannot Be Tested Within 2 Hours Should