Hello knowledgeable ones. I know ESR is erythrocyte sedimentation rate. But has anyone had ECR written in their methotrexate book? OH has with results ranging from >90 to 80s, but even the rheumy nurse didn't know what it was. Anyone know? Or do you reckon the GP nurses are so rubbish they meant ESR? Rheumy nurse said it shouldn't be as they don't do that any more.