53. A 50-year-old woman presented to the clinic with polyarthralgia affecting distal and proximal interphalangeal joints bilaterally for 3 years. She does not have significant early morning stiffness. Clinical examination revealed no active arthritis, but there were
non-tender hard nodules over some distal interphalangeal joints (see lab results).
Test result
Hb 140
Platelets count 190
WBC 11
ESR 15
C-reactive peptide 5
Rheumatoid factor 30
Urea 4
creatine 75
Normal values
Hb 130-190 g/L (Male) 120-160 (Female)
Platelets count 150-400 *10^9 g/L
WBC 4.5-10.5 * 10^9 g/L
ESR 2-10 mm/h (Male) 3-15 mm/h (Female)
C-reactive peptide <8.2 mg/L
Rheumatoid factor <58 KIU/L
Urea 2.75-7.4 mmol/L
Creatine 44-115 pmol/L
Which of the following is the most likely rheumatological disease?