Urine protein-to-creatinine ratio (PCR) mg/g → mg/mmol
Convert urine protein-to-creatinine ratio (pcr) from mg/g to mg/mmol
Sources last checked: 2026-11-03
Urine protein-to-creatinine ratio (PCR) mg/g → mg/mmol
Convert urine protein-to-creatinine ratio (pcr) from mg/g to mg/mmol
Converts units only; reference ranges depend on the laboratory, the assay and the patient.
What is the Urine protein-to-creatinine ratio (PCR) mg/g → mg/mmol?
The urine protein-to-creatinine ratio (PCR) relates total urinary protein to creatinine in a spot sample. It is reported in mg/g (sometimes as g/g or mg/mg) in the USA and Turkey and by many laboratories in German-speaking countries, and in mg/mmol in the UK and many other SI-based laboratories. The converter divides by 8.84, the number of millimoles in one gram of creatinine (molar mass 113.12 g/mol).
When to use it
- Comparing a mg/g PCR with UK or SI-based guidelines, nephrology papers or trial reports
- Following proteinuria in glomerular disease when serial values come from laboratories with different units
- Reading obstetric literature on proteinuria in pregnancy written in mg/mmol
When not to use it
- Albumin-to-creatinine ratio — same factor, different analyte; PCR and ACR are not interchangeable
- 24-hour protein excretion in g/day or mg/day
- Dipstick protein grades, which are semi-quantitative
How it is calculated
PCR (mg/mmol) = PCR (mg/g) ÷ 8.84
Clinical pearls and limitations
- Converts units only; reference ranges depend on the laboratory, the assay and the patient.
- mg/mmol = mg/g ÷ 8.84.
- A ratio given as g/g or mg/mg equals mg/g ÷ 1000; multiply it by 1000 before using this converter.
- PCR measures all urinary proteins, including low-molecular-weight tubular proteins, so it can be raised while the ACR is low — for instance in tubular proteinuria.
- Like ACR, the ratio assumes average creatinine excretion and varies with sampling time; first-morning samples and confirmation on repeat are preferred.
Frequently asked questions
How do I convert PCR from mg/g to mg/mmol?
Divide by 8.84. Example: 250 mg/g ÷ 8.84 = 28.3 mg/mmol; 900 mg/g ÷ 8.84 = 101.8 mg/mmol.
Can PCR be converted into ACR?
Not with a fixed factor. The share of albumin in total urinary protein varies between diseases and between individuals; equations that estimate one ratio from the other exist but carry wide uncertainty.
How does a mg/g ratio relate to daily protein excretion?
Because daily creatinine excretion is broadly similar among many adults, the mg/g ratio is often read as an approximation of protein excretion per day. The approximation fails at the extremes of muscle mass and when kidney function is changing rapidly.
Evidence and guidelines
Have a follow-up question?
Medelix answers clinical questions from current guidelines and studies — every statement with its source.
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