N-Methylhistamine, 24 Hour, Urine
Test code
CPT code(s)*
Clinical significance
Test resources
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Details
Includes
Creatinine
CPT code 81050 may be added at an additional charge for volume measurement
Methodology
Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS) • Enzymatic Colorimetric Assay
Specimen requirements | |
|---|---|
| Patient preparation | Patient must not be taking monoamine oxidase inhibitors (MAOIs) or aminoguanidine as these medications increase N-methylhistamine (NMH) levels. |
| Preferred specimen(s) | 5 mL aliquot of urine collected in 24-hour no preservative container |
| Minimum volume | 3 mL |
| Collection instructions | 1. Collect urine for 24 hours 2. No preservative 3. Aliquot into plastic tube and send at refrigerate temperature The addition of preservative or application of temperature controls must occur within 4 hours of completion of the collection. Note: Random urine collections are preferred for patients with episodic symptoms, for example in the context of allergic reactions, brought on by specific environmental factors. See 39604 N-Methylhistamine, Random, Urine. If ordering this test with 39559- N-Methylhistamine, 24 Hour, Urine/10109- 2,3-Dinor-11 Beta-Prostaglandin F2 Alpha, 24 Hour, Urine; both tests must be ordered under a different order number. They cannot share an order number. If the total volume provided is less than 300 mL, this test will be canceled and NMHR (39604) will be ordered and performed. |
| Transport container | Plastic urine container |
| Transport temperature | Frozen |
| Specimen stability | Room temperature: 14 days Refrigerated: 28 days Frozen: 28 days |
Reference Range(s)
N-Methylhistamine, 24 Hour, Urine
| 0-5 years | 120-510 mcg/g Cr |
| 6-16 years | 70-330 mcg/g Cr |
| >16 years | 30-200 mcg/g Cr |
| Creatinine, 24 Hour, Urine | See Laboratory Report |
Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.
*The CPT codes provided are based on AMA guidance and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.
This material contains content from LOINC® (http://loinc.org). The LOINC Table, LOINC Table Core are copyright © 1995-2019, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license.
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