Urine & CSF

Cystine (24-h urine) unit converter

Cystine excreted in 24-hour urine (cystinuria, kidney stones)

Also known as: Urinary cystine, Cystin im Urin

Converter

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

mg/24 h µmol/24 h

Worked example

77.5 µmol/24 h (middle of the reference range) = 18.6 mg/24 h

Conversion formulas

mg/24 h	mg/24 h = µmol/24 h × 0.2403	µmol/24 h = mg/24 h × 4.161

Good to know

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

mg/24 h × 4.161 = µmol/24 h (exact factor 4.161).
The range shown is a guide from the named source; targets and reference ranges differ between laboratories, methods and indications, so compare with the range on your own report.

Reference range

Unit	Adults	Men	Women
mg/24 h	3.605 – 33.65	3.605 – 33.65	3.605 – 13.22
µmol/24 h	15 – 140	15 – 140	15 – 55

Source: Severn Pathology (North Bristol NHS Trust): Cystine 24 hour excretion · Last reviewed: 2026-10-19

Note from the source: Men 15-140 µmol/24 h, women 15-55 µmol/24 h (Severn Pathology). Collect into an acid container

Frequently asked questions

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

mg/24 h = µmol/24 h × 0.2403. In the other direction: µmol/24 h = mg/24 h × 4.161.

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

For adults the range is 15 – 140 µmol/24 h (Severn Pathology (North Bristol NHS Trust): Cystine 24 hour excretion). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

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

Common units are mg/24 h, µmol/24 h.