Metanephrines, Plasma Free
Patient should avoid alcohol, coffee, tea, tobacco and strenuous exercise prior to collection. Overnight fasting is preferred. Patients should be relaxed in either a supine or upright positiion before blood is drawn.
Draw blood in a pre-chilled lavender EDTA tube, Sample should be kept on wet ice until centrifugation. Spin and separate the plasma from the cells within 2 hours of collection. Send 2.5 mL plasma (1.5 mL minimum) in a screw-capped plastic vial, send with cold packs if it’ll arrive after 24 hours of collection.
Liquid Chromatography/Tandem Mass Spectrometry
Room temp: 24 hours, Refrigerated: 14 days, Frozen: 30 days
The reference ranges are determined by the performing laboratory and will show on the report.
4-5 days performed Sunday-Friday