Urine & CSF

Metanephrine (24-h urine) unit converter

Metanephrine excreted in 24-hour urine (phaeochromocytoma work-up)

Also known as: Urinary metanephrine, Metanephrine urine 24h, Metanephrin im Urin

Converter

Enter a value in any unit and all other units fill in.

µg/24 h nmol/24 h

Worked example

1100 nmol/24 h (middle of the reference range) = 217 µg/24 h

Conversion formulas

µg/24 h	µg/24 h = nmol/24 h × 0.1972	nmol/24 h = µg/24 h × 5.07

Good to know

Metanephrine in 24-hour urine is reported in µmol/24 h, nmol/24 h or in µg/24 h.

µg/24 h × 5.07 = nmol/24 h (exact factor 5.0702); 1 µmol/24 h = 1000 nmol/24 h.
Some laboratories report the hydrochloride salt, which has a higher molar mass; check the report. Several drugs interfere.

Reference range

Unit	Adults	Men	Women
µg/24 h	0 – 433.9	0 – 433.9	0 – 355
nmol/24 h	0 – 2200	0 – 2200	0 – 1800

Source: Newcastle Hospitals Laboratories: Metanephrines, 24h collection, urine · Last reviewed: 2026-10-19

Note from the source: Adults: women up to 1.8 µmol/24 h, men up to 2.2 µmol/24 h (LC-MS/MS; Newcastle Hospitals Laboratories). Children have age-dependent ranges; several drugs interfere

Frequently asked questions

How do I convert Metanephrine (24-h urine) from nmol/24 h to µg/24 h?

µg/24 h = nmol/24 h × 0.1972. In the other direction: nmol/24 h = µg/24 h × 5.07.

What is the reference range of Metanephrine (24-h urine)?

For adults the range is 0 – 2200 nmol/24 h (Newcastle Hospitals Laboratories: Metanephrines, 24h collection, urine). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for Metanephrine (24-h urine)?

Common units are µg/24 h, nmol/24 h.