Store the urine specimen in a cooler with iceThe urine specimen that is collected for endocrine testing should be stored in a cooler with ice to prevent bacterial growth in the specimen. The nurse should instruct the client to start the urine collection after emptying the bladder. The client should be instructed not to store the urine specimen in a home refrigerator with other food and drinks as it could lead to cross-contamination. The client should be instructed to refrain from saving the urine specimen that begins the collection because the timing for urine collection starts from after the initial voiding specimen.