Normetanephrine
10 days
Liquid chromatography/tandem mass spectrometry (LC/MS-MS)
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Plasma test for free metanephrines. Used in pheochromocytoma diagnosis.
Plasma
1.2 mL
Lavender-top (EDTA) tube
Patient should be fasting overnight (water and non-caffeinated soft drinks are permissible) Patient should avoid alcohol coffee tea tobacco and strenuous exercise prior to collection See Limitations section for more information about other potential causes of elevated metanephrines
Draw blood in chilled lavender-top (EDTA) tube. Invert to mix with preservatives. Centrifuge and transfer the plasma to a labeled plastic transport tube. Refrigerate or freeze separated plasma immediately. Important: The patient should be in a fully recumbent position (lying down) for at least 20 minutes before and during sample collection.
| Temperature | Period |
|---|---|
| Refrigerated | 14 days |
| Frozen | 14 days |