ESR can be normal in giant cell arteritis and polymyalgia rheumaticaBMJ 2012; 344 doi: https://doi.org/10.1136/bmj.e1408 (Published 28 February 2012) Cite this as: BMJ 2012;344:e1408
- Toby Helliwell, general practitioner and NIHR in practice research fellow1,
- Sara Muller, research associate: clinical epidemiology1,
- Samantha Hider, clinical lecturer and honorary consultant rheumatologist1
It is potentially dangerous to suggest that normal inflammatory markers can be used to rule out illnesses such as giant cell arteritis and polymyalgia rheumatica.1 Although patients with polymyalgia rheumatica will probably come to no serious long term harm from undiagnosed illness, this cannot be said about giant cell arteritis, where a delayed or missed diagnosis has potentially serious implications, including permanent loss of vision. In these two diseases up to 22.5% of patients can have a normal erythrocyte sedimentation rate (ESR).2 Patients with a delayed diagnosis of giant cell arteritis are often those who present with atypical features,3 and a case review of 80 patients showed that three patients with giant cell arteritis associated blindness had a normal ESR.2 Although normal inflammatory markers make the diagnosis more unlikely, if there is a clinical suspicion, early referral should be sought, especially in suspected giant cell arteritis.4 5
Cite this as: BMJ 2012;344:e1408
Competing interests: None declared.