Adrenaline (Epinephrine), Plasma

You should get a plasma adrenaline test if you have episodes of severe headache, sweating, palpitations, anxiety, tremors, or high blood pressure that is difficult to control or occurs in spells. It is also recommended for an adrenal mass seen on a scan, or a family history of pheochromocytoma or related genetic syndromes.

Fast overnight (8–12 hours) before a plasma adrenaline test. Avoid caffeine, alcohol, smoking, and strenuous exercise for at least 24 hours. Inform your doctor about decongestants, antidepressants, or blood pressure medicines, but don’t stop them without advice. You will lie down and rest for 20–30 minutes before the sample, often through a pre-placed cannula.

Yes, fasting is usually recommended for a plasma adrenaline test. You should fast overnight for 8–12 hours, drinking only water. Also avoid caffeine, alcohol, smoking, and strenuous exercise for at least 24 hours beforehand, as they can raise adrenaline levels and affect the accuracy of your results.