Why is collecting the first morning void important for Total Tox Burden and Organic Acids?

The first voided morning specimen is particularly valuable because it tends to be more concentrated, relatively free of dietary influences and changes due to physical activity, thus abnormalities are more easily detected.

If the patient accidentally filled the tube with a later void instead of the first, but has not shipped the tube out yet, they can simply pour out the vial and collect their first waking urine the next day.

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