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Diagnosis of porphyrias, lead poisoning.
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Collect 24 hour urine specimen. Add 5 grams of Sodium Carbonate (1 gram for pediatric patients) to container prior to start of collection; do not use Sodium Bicarbonate. Aliquot 50 mL into a plastic urine container and refrigerate. Protect specimen from light. Record total 24 hour urine volume and collection dates/times on request form. Random urine also acceptable; random urine collection does not require preservative.