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How do metanephrine levels rule out pheochromocytoma?

The body breaks down adrenaline into metanephrines, and either 24 hour urine collection or plasma (blood) levels can rule in or out a pheochromocytoma. Many physicians feel that the 24 hour urine test is better than the plasma test because it has fewer false positives (fewer cases of a positive test in someone who does not have a pheochromocytoma).

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.