Medically reviewed by Stella Bard, MD A rheumatoid factor (RF) test detects rheumatoid factor, a type of antibody (proteins ...

Medically reviewed by David Ozeri, MD The erythrocyte sedimentation rate (ESR) blood test measures how quickly erythrocytes, ...

Learn what happens during an ESR test, how to interpret your results, and why this simple blood test remains a crucial tool ...

The American Cancer Society recommends people at average risk of colorectal cancer start screening at age 45, now several blood tests could help.