The ACR/EULAR 2009 rheumatoid arthritis diagnostic criteria are divided into 4 parts (as follows), and a total score of 6 or more points for the 4 part scores confirms the diagnosis of rheumatoid arthritis: Number of joints involvedJoint condition score (0-5 points)1 medium to large joints02-10 medium to large joints11-3 small joints24-10 small joints3>10 at least 1 is a small joint5 Serology score (0- 3 points)RF or anti-CCP antibodies are negative0RF or anti-CCP antibodies are at least 1 low titer positive2RF or anti-CCP antibodies are at least 1 high titer positive3 Duration of synovitis score (0-1 points)<6 weeks0>6 weeks1 Acute temporal reactants score (0-1 points)CRP or ESR are normal0CRP or ESR is increased1 If imaging shows rheumatoid arthritis, it can be directly diagnosis, the score was skipped.