|Mnemonic: ||[U Metaneph]|
|Name: ||Metanephrines Fractionated by HPLC-MS/MS, Urine|
|Specimen: ||4 mL aliquot from a 24 hour or random urine collection. Recommended Patient Preparation: Abstain from medications for 72 hours prior to collection. Consult with your physician.|
|Minimum Spec: ||1.5 mL|
|Transport Temp: ||Refrigerated|
|Spec Stability: ||Stable up to 2 weeks refrigerated.|
|Ref Lab/Code: ||ARUP 2007996|
| Method: ||HPLC/Tandem Mass Spectrometry|
|Note: ||A metanephrine-to-creatinine ratio will be reported when: |
1) the patient is under 18 years or
2) the urine collection is random or other than 24 hours or 3) the urine volume is less than 400 mL/24 hours.
|Processing Info: ||Record the sample total volume and collection time interval on the transport tube. Have a tech verify the SR TIME and SR VOLUME in the computer before transmitting the packing list.|
Adequate refrigeration is the most important aspect of specimen preservation. Stability can be enhanced at pH 2 - 4. A pH of < 2 may cause assay interference.