The collector directs the donor to go into the restroom and provide a specimen. The collector must remind the donor to guard against flushing the commode or washing hands until the donor has handed his or her specimen to the collector. (Note: Inadvertently flushing the commode does not automatically require any corrective action by the collector or a recollection. However, to avoid this happening, the collector may want to place obvious signage in the restroom with instructions not to flush the commode or to wash hands.)

The collector may set a reasonable time limit for the donor to be inside the restroom. Since the temperature of the specimen must be read without four minutes of urination, a time limit of four minutes in most cases is not unreasonable. The collector should pay close attention to the donor during the entire collection process to note any conduct that clearly indicates an attempt to substitute, adulterate, or dilute the specimen.