Sed rate, i.e. Erythrocyte sedimentation rate (ESR) is done?

Info source: 

http://www.mayoclinic.org/tests-procedures/sed-rate/basics/why-its-done/prc-20013502

Sed rate tests were used more frequently in the past than they are today because more-specific measures of inflammatory activity are now available. Today, the test is most often used if your doctor suspects you have:

• Giant cell arteritis
• Polymyalgia rheumatica
• Rheumatoid arthritis

A sed rate test can also help determine the severity of your inflammatory response and monitor the effect of treatment.

Because a sed rate test can't pinpoint the problem that's causing inflammation in your body, it's usually accompanied by other blood tests, such as the C-reactive protein (CRP) test.

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