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Urinary N-Methylhistamine

Reference Range

The primary application of urinary N-methylhistamine (NMH) testing is in the diagnosis and monitoring of mast-cell disorders, including mastocytosis, anaphylaxis, and other severe systemic allergic reactions.

The reference range for urinary NMH varies according to subject age, as follows:

Age 0-5 years – 120-510 µg/g creatinine

Age 6-16 years – 70-330 µg/g creatinine

Older than16 years – 30-200 µg/g creatinine

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