In a 24-hour urine collection, what is the correct initial step?

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Starting a 24-hour urine collection correctly means discarding the first morning void and beginning the 24-hour period with the next urine, while keeping all urine collected in a labeled container kept cold, and recording the exact start and end times. This approach ensures every drop produced during that 24-hour window is counted, preventing an incomplete or skewed result. Keeping the sample on ice or refrigerated slows bacterial growth and chemical changes, preserving the analytes being measured. Promptly returning the container with clear start/end times helps the lab accurately calculate the total excretion.

Disregarding the first morning void would bias the measurement, and collecting only 12 hours would not capture a full 24-hour excretion. Storing at room temperature before labeling risks degradation or changes in the sample.