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Metanephrines, Free, fractionated, plasma
| Item | Value | ||||||
|---|---|---|---|---|---|---|---|
| Approval req'd? | No | ||||||
| Available Stat? | No | ||||||
| Test code | METNF | ||||||
| Test group | Metanephrines | ||||||
| Performed by | Quest | ||||||
| Sendout? | Yes | ||||||
| Method | LC/MS/MS | ||||||
| Patient Preparation | Patient should be relaxed in either a supine or upright position before blood is drawn. Patients should avoid alcohol, coffee, tea, tobacco and strenuous exercise prior to collection. Overnight fasting is preferred. | ||||||
| Collection Instructions | Draw specimen in a pre-chilled EDTA Lavender top (6 mL) and send to Lab on ICE. | ||||||
| Container type | Lavender top 6 mL (on ice) | ||||||
| Amount to Collect | 6 mL blood | ||||||
| Sample type | Plasma | ||||||
| Preferred volume | 2.5 mL plasma | ||||||
| Min. Volume | 1.5 mL plasma | ||||||
| Processing notes | Maintain on ice until centrifuged. Separate the plasma within 2 hours of venipuncture. Freeze plasma immediately. Store frozen at -20C. Ship on dry ice to China Basin. Order Quest test # 19548. | ||||||
| Units | pg/mL | ||||||
| Normal range |
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| Synonyms | Metanephrines, plasma; plasma metanephrines; | ||||||
| Stability | Room temperature 4 hours, refrigerated 2 weeks, frozen at -20C 2 weeks. | ||||||
| Additional information | Normetanephrine (NM) and metanephrine (MN) are the extra-neuronal catechol-o-methyltransferase (COMT) metabolites of the catecholamines norepinephrine and epinephrine, respectively. Measurement of plasma metanephrines is more sensitive (but may be less specific) than measurement of catecholamines for the detection of pheochromocytoma. Proper interpretation of results requires awareness of recent medication/drug history(e.f., antihypertensive agents, alcohol, cocaine) and other pre-analytical factors (e.f., stree, severe congestive heart failure, myocardial infarction) that influence release of catecholamines and metanephrines. | ||||||
| CPT coding | 83835-90 | ||||||
| Last Updated | 12/19/2012 4:35:49 PM | ||||||
| Entry Number | 1311 |
If you have additional questions regarding this test, please call: 415-353-1667