Metanephrines

Metanephrines is a topic covered in the Davis's Lab & Diagnostic Tests.

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Synonym/Acronym:
N/A

Rationale
To assist in the diagnosis of cancer of the adrenal medulla or to assess for the cause of hypertension.

Patient Preparation
There are no food, fluid, or medication restrictions unless by medical direction. Instruct the patient to avoid excessive exercise and stress during the 24-hr collection of urine. Usually a 24-hr urine collection may be ordered. As appropriate, provide the required urine collection container and specimen collection instructions.

Normal Findings
Method: High-pressure liquid chromatography.

AgeConventional UnitsSI Units
Normetanephrines(Conventional Units × 5.07)
3 mo–4 yr54–249 mcg/24 hr274–1,262 micromol/day
5–9 yr31–398 mcg/24 hr157–2,018 micromol/day
10–17 yr67–531 mcg/24 hr340–2,692 micromol/day
18–39 yr35–482 mcg/24 hr177–2,444 micromol/day
Greater than 40 yr88–676 mcg/24 hr446–3,427 micromol/day
Metanephrines, Total(Conventional Units × 5.07)
3 mo–4 yr79–345 mcg/24 hr401–1,749 micromol/day
5–9 yr49–409 mcg/24 hr248–2,074 micromol/day
10–17 yr107–741 mcg/24 hr543–3,757 micromol/day
18–39 yr94–695 mcg/24 hr477–3,524 micromol/day
40–49 yr182–739 mcg/24 hr923–3,747 micromol/day
Greater than 50 yr224–832 mcg/24 hr1,136–4,218 micromol/day

Critical Findings and Potential Interventions
N/A

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