|Metanephrines, Fractionated, 24 Hour, Urine||
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
||Send Out||mcg/24 hours|
Metanephrine, Normetanephrine, Total Metanephrine
Urine, 24 hours
|Container Type||Container Size||Specimen Volume|
24 hour urine container
Refrigerated - 7 day(s)
Frozen - 14 day(s)
Room temperature - 7 day(s)
- Refrigerate during collection
- Transport to laboratory as soon as possible
Reasons for Rejection
- Wrong type of specimen
Patient Preparation: Tricyclic antidepressants, labetalol, and sotalol medications may elevate levels of metanephrines producing results that cannot be interpreted. If clinically feasible, it is optimal to discontinue these medications at least 1 week before collection. For advice on assessing the risk of removing patients from these medications and alternatives, you may consider consultation with a specialist in endocrinology or hypertension.
Collect urine for 24 hours. At beginning of collection have patient void and discard this urine. Begin timing collection at this point and collect all urine until the end of the collection period. Have patient void and save urine at the final collection period. If testing is requested on a random sample order test code XMETAR to Mayo.