A 24-hour urine collection for vanillylmandelic acid (VMA) has been ordered on a child suspected of having neuroblastoma. When is the most appropriate time for the nurse to begin the collection?
1. At 0700
2. After the next time the child voids
3. At bedtime
4. When the order is noted
Correct Answer: 2
Rationale: A 24-hour urine collection is started after the child voids. That specimen is not saved, but all subsequent specimens in that 24-hour period should be collected. It would not be an accurate collection of 24 hours of urine if the collection began at 0700, bedtime, or when the order is noted.
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