How do I convert Homovanillic acid (24-h urine) from mg/24 h to µmol/24 h?

µmol/24 h = mg/24 h × 5.489. In the other direction: mg/24 h = µmol/24 h × 0.1822.

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

Common units are mg/24 h, µmol/24 h.

Urine & CSF

Homovanillic acid excreted in 24-hour urine (neuroblastoma)

Also known as: Homovanillinsäure (24-h-Urin)

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

mg/24 h µmol/24 h

10 µmol/24 h = 1.82 mg/24 h

µmol/24 h	µmol/24 h = mg/24 h × 5.489	mg/24 h = µmol/24 h × 0.1822

Homovanillic acid (24-h urine) is reported in mg/24 h or µmol/24 h. The page converts between the units only.

µmol/24 h × 0.1822 = mg/24 h (exact factor 0.1822).
No established reference range is listed here; compare your result only with the range printed on your own report.

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Source: PubChem: Homovanillic Acid · Last reviewed: 2026-10-19

Note from the source: No established reference range; the page converts units only. Mass-to-amount conversion uses a molar mass of 182.17 g/mol.