Avoid taking allergy causing drugs, antihistamines, oral corticosteroids, and substances which block H2 receptors for at least 24 hours prior to specimen collection. Avoid direct sunlight during the collection.
1. Collect urine for 24 hours, either with 10 mL 6N HCL preservative (preferred), or with no preservative.
2. Avoid direct sunlight during the 24 Hour collection.
3. Send specimen refrigerated in the plastic, 10-mL urine tube
4. Collection volume and duration are required