4 - 11 days
HISTAMINE, 24-HOUR, URINE
Histamine, 24-Hour Urine
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Documentation of immediate hypersensitivity reactions or diagnosis of patients with systemic mastocytosis. Elevated values are seen in patients with anaphylaxis, with urticaria, or following provocative skin tests.
0.006 - 0.131 mg/24 hour
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Collect 24 hour urine specimen. Add 30 mL of 6 N HCl (10 mL for pediatric patients) to container prior to start of collection. Following collection, mix well, measure 24 hour urine volume, aliquot 4 mL into a plastic urine container and refrigerate. Record total 24 hour urine volume and collection dates/times on request form. Specimens with no preservative are also acceptable: add HCl to container following collection, mix well and send 4 mL aliquot (preferred); alternatively a non-acidified aliquot will be accepted. Patient should void antihistamines, oral corticosteroids, and substances that block H2 receptors for at least 24 hours prior to specimen collection.