To ensure an accurate urine endocrine test result, which instruction should the nurse provide?

• A. Start the urine collection when the bladder is full.
• B. Store the urine specimen in a cooler with ice.
• C. Store the urine specimen in a home refrigerator.
• D. Save the urine specimen that begins the collection.

Answer: (B)

Preserving the sample by keeping it cold is essential for urine endocrine testing. Many urinary hormones and metabolites are unstable at room temperature, and bacterial growth can alter their concentrations. Placing the specimen in a cooler with ice during collection and transport slows degradation and keeps the analytes closer to their true levels when they’re analyzed.

Starting the collection with the bladder full isn’t what ensures accuracy, and a home refrigerator isn’t as reliable for maintaining a constant, very cold temperature throughout the collection period. Also, for a 24-hour collection you typically discard the first void to start the timing, rather than saving it.