Which step is part of the proper protocol for starting a 24-hour urine collection?

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For a 24-hour urine collection, the timing must define a clear start and end of the window and include every urine produced during that period. The correct approach is to void once, discard that initial morning sample, start the timer, and then collect all urine for the next 24 hours, finishing with the first morning urine of the following day. This ensures the measured output truly represents a full 24-hour interval and avoids contaminating or shortening the collection with urine produced before the start. If the first morning sample were included as the start or if the start time isn’t clearly defined, the total volume and analyte excretion could be skewed. Weekday versus weekend collection isn’t relevant to accuracy, so that part isn’t a factor in proper protocol.