VANILLYL MANDELIC ACID; VMA, 24 HOURS URINE

What this test checks

Measures vanillyl mandelic acid, a breakdown product of adrenaline hormones. Very high levels suggest a rare tumour of the adrenal gland.

Why do people get this test?

Used to investigate unexplained, hard-to-control high blood pressure with sudden spikes.

When you should consider this test

• Sudden episodes of high blood pressure
• Unexplained sweating, headaches, palpitations
• Family history of adrenal tumours

How to prepare

24-hour urine collection. Avoid coffee, tea, chocolate, bananas, and vanilla for 48 hours before collection.