The erythrocyte sedimentation rate test observes how quickly red blood cells fall to the bottom of a test tube. During normal circumstances, these cells descend slowly through the plasma.

Medically reviewed by Stuart Hershman, MD Blood tests are generally not used to diagnose the cause of back pain, but they are ...

The most commonly used inflammatory markers are: Also known as the sed rate, the ESR is a blood test that detects the ...