Which statement correctly describes urine specimen storage?

Which statement correctly describes urine specimen storage?

• A. Store at room temperature indefinitely.
• B. Keep at room temperature for up to 8 hours.
• C. Refrigerate the specimen if not tested within an hour; room temperature beyond an hour is not acceptable.
• D. Refrigerate if not tested within an hour; room temperature beyond an hour is not acceptable.

Answer: (D)

Preserving urine specimens to keep test results accurate relies on slowing down changes that happen after collection. At room temperature, bacteria grow quickly and many urine components can degrade, shift pH, or precipitate, all of which can alter chemical and microscopic findings. Refrigeration slows these processes, helping maintain stability for a short period. That’s why the recommended practice is to refrigerate the specimen if it won’t be tested within about an hour; leaving it at room temperature beyond that hour is not acceptable because it increases the risk of inaccurate results. Indefinite room-temperature storage is incorrect, and allowing room temperature storage for several hours also risks compromising accuracy.

Preserving urine specimens to keep test results accurate relies on slowing down changes that happen after collection. At room temperature, bacteria grow quickly and many urine components can degrade, shift pH, or precipitate, all of which can alter chemical and microscopic findings. Refrigeration slows these processes, helping maintain stability for a short period.

That’s why the recommended practice is to refrigerate the specimen if it won’t be tested within about an hour; leaving it at room temperature beyond that hour is not acceptable because it increases the risk of inaccurate results. Indefinite room-temperature storage is incorrect, and allowing room temperature storage for several hours also risks compromising accuracy.