ESR — The Sed Rate and What It Cannot Tell You
The sed rate (ESR) shows how fast red blood cells settle; faster settling is consistent with inflammation but does not say where or why.
The erythrocyte sedimentation rate (ESR, or sed rate) measures how quickly red blood cells settle to the bottom of a tube of blood — faster settling is consistent with inflammation somewhere in the body.
The test does not say where or why, and several everyday factors move it, which is why it is read in context rather than as a verdict.
The biomarker
- Name: Erythrocyte Sedimentation Rate
- Units: mm/hr
- Standard range: Westergren method, per the MedlinePlus encyclopedia: men under 50 below 15 mm/hr, men over 50 below 20 mm/hr, women under 50 below 20 mm/hr, women over 50 below 30 mm/hr (ranges vary by lab).
How to read your result
| Result | What it means |
|---|---|
| Normal | Within the laboratory range for your age and sex. |
| High | Red cells sank faster than normal, which is consistent with inflammation; a raised ESR does not always mean a condition that needs treatment — discuss with a clinician. |
| Context | Pregnancy, the menstrual cycle, aging, obesity, regular alcohol use and exercise can all affect the result, as can certain medicines and supplements. |
| ESR vs hs-CRP | Both reflect inflammation but are different measurements; one is not a substitute for the other. |
What moves the needle
- Reading it: an ESR is a non-specific signal; its value is in combination with symptoms, an examination and other tests.
- If flagged: ask whether it should be repeated or paired with other inflammation tests before anything is concluded.
- Tell the clinician: mention pregnancy, where you are in your cycle, and any medicines or supplements — each can shift the result.
- Never: do not self-treat a raised sed rate.
Related protocols
Sources
AgeGen lab guides are educational only. We do not provide medical diagnosis, prescribe brands, or recommend specific doses. Talk to a licensed clinician before changing your supplement or medication routine.
