ESR optimal range and reference range
Compiled by Alina Radu, founder of Sera, from the published sources below · Last reviewed November 9, 2026
Sera's bands for ESR, which differ for men and women:
- Female: Optimal 0 – 10 mm/hr; sufficient 0 – 20 mm/hr; out of range below 0 or above 20 mm/hr.
- Male: Optimal 0 – 5 mm/hr; sufficient 0 – 20 mm/hr; out of range below 0 or above 20 mm/hr.
Evidence grade: Published reference interval. A band that primarily reflects a published adult laboratory or population reference interval. It is not necessarily applicable to every assay or laboratory.
All units
| Unit | Applies to | Optimal | Sufficient | Out of range |
|---|---|---|---|---|
| mm/hr | Female | 0 – 10 | 0 – 20 | below 0 or above 20 |
| mm/hr | Male | 0 – 5 | 0 – 20 | below 0 or above 20 |
What the evidence says
The acceptable band ends at 20 mm/hr, the published upper limit for women under 50 and for men over 50. ESR rises with age and is higher in women: the limit usually quoted is 15 for men under 50 and 30 for women over 50, and Sera does not adjust for age, so a man under 50 between 15 and 20 is above his laboratory's range and a woman over 50 between 20 and 30 is within hers. The narrower optimal bands, ending at 10 for women and 5 for men, are functional targets with no published evidence behind them. Laboratories using automated methods print their own limits, which take precedence.
Sources
- ESR — MedlinePlus Medical Encyclopedia, US National Library of Medicine, 2025 · Government / public-health guidanceNormal Westergren results: men under 50 less than 15 mm/hr, men over 50 less than 20, women under 50 less than 20, women over 50 less than 30. Sera's edge of 20 matches women under 50 and men over 50. Reviewed 1 July 2025.
- Sedimentation Rate, Modified Westergren (test 005215) — Labcorp test directory, 2026 · Laboratory / reference-interval sourceMen 0 to 15 mm/hour up to age 50 and 0 to 30 after; women 0 to 32 up to 50 and 0 to 40 after. Agrees with 15 for younger men; wider than Sera's 20 for women and for older men. Current directory entry, opened October 2026.
- Erythrocyte Sedimentation Rate Reference Intervals Determined via VES-MATIC 5 and CUBE 30 Touch with Respect to the Westergren Method — Lorubbio M, Diamanti D, Pieroni C, et al. — Diagnostics (Basel), 2025 · Peer-reviewed publicationIn 989 presumably healthy Italian adults, Westergren reference intervals were 1 to 22 mm/h for women of any adult age, 1 to 14 for men aged 18 to 69 and 1 to 22 for men of 70 or more. Close to Sera's 20 for women; lower for most men.
What ESR (Erythrocyte Sedimentation Rate) measures
A general marker of inflammation in the body.
Raised in infections, autoimmune conditions, and long-term inflammation. Useful for keeping an eye on your overall inflammation.