NHA Certified Clinical Medical Assistant (CCMA)Clinical Patient CareMedium
A medical assistant is educating a patient about collecting a 24-hour urine specimen. Which of the following instructions is most important to ensure an accurate collection?
- AAdd a preservative to the container after each urination.
- BStore the collection container at room temperature.
- CDiscard the first morning urine on the first day of collection.
- DCollect the first morning urine on the day of collection.
Show answer & explanationAnswer & explanation
Correct answer: C. Discard the first morning urine on the first day of collection.
For a 24-hour urine collection, the first morning urine on the first day is typically discarded to establish a precise start time. All subsequent urine for the next 24 hours, including the first morning urine on the second day, is then collected.
Why the other options are wrong
- A. Preservatives, if needed, are usually pre-added to the container or added according to specific lab instructions, not after each urination by the patient.
- B. Most 24-hour urine specimens require refrigeration or a cooler with ice to prevent bacterial growth and degradation of analytes.
- D. Collecting the first morning urine on the first day would make the collection period longer than 24 hours or lead to an inaccurate start time.
24-Hour Urine Collection Start
To accurately begin a 24-hour urine collection, the patient should discard their first morning urine on the first day to establish a precise start time, then collect all subsequent urine for the next 24 hours.
- Discard first morning urine on day 1.
- Establishes precise 24-hour window.
- Ensures accurate analysis of excreted substances.
Memory trick: Discard First, Collect All, Keep Cold, End with First.