CRP and rheumatoid arthritis: Moreover, in the 6 patients with strict Boolean remission (tender and joint score ≤ 1, PGA ≤ 1 (0–10 cm), CRP ≤ 1 mg/dl), 20/168 joints were PET/CT-positive, and 9/168 were US-positive, suggesting a dissociation of PET/CT metrology and the clinical assessment in RA patients in remission.