Frequent urine testing for specific gravity and glucose are required on a 6-month-old infant. Which is the most appropriate way to collect small amounts of urine for these tests?

A) Apply a urine-collection bag to the perineal area.
B) Tape a small medicine cup to the inside of the diaper.
C) Aspirate urine from cotton balls inside the diaper with a syringe.
D) Aspirate urine from a superabsorbent disposable diaper with a syringe.

To obtain small amounts of urine, use a syringe without a needle to aspirate urine directly from the diaper. If diapers with absorbent material are used, place a small gauze dressing or cotton balls inside the diaper to collect the urine, and aspirate the urine with a syringe. For frequent urine sampling, the collection bag would be too irritating to the child's skin. It is not feasible to tape a small medicine cup to the inside of the diaper; the urine will spill from the cup. Diapers with superabsorbent gels absorb the urine, so there is nothing to aspirate.