Plasma Free Metadrenalines (Metanephrines)

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Also known as: Plasma metadrenalines
Formal name: Plasma free metadrenalines (normetadrenaline and metadrenaline)

At a Glance

Why Get Tested?

To help diagnose or rule out a phaeochromocytoma

When to Get Tested?

When you have persistent or episodic high blood pressure and symptoms such as headaches, rapid heart rate, and sweating

Sample Required?

A blood sample taken from a vein in your arm

Test Preparation Needed?

Preparation for the test is important for accurate results. You should discontinue adrenaline (epinephrine) and adrenaline-like drugs for at least one week before the test, stop using paracetamol (acetaminophen) 48 hours beforehand, and fast for 8-10 hours prior to collection. It is especially important not to have any caffeine-containing food (e.g. chocolate) or drinks (e.g. energy drinks like Red Bull, Coca-Cola, coffee and tea (including decaffeinated). Tobacco (smoking cigarettes or cigars) and alcohol must also be avoided for at least 4 hours before specimen collection. Talk to your doctor about any medications you are taking, since several different drugs may interfere with the test.