CRP and rheumatoid arthritis: Laboratory investigations of RA revealed elevated levels of rheumatoid factor (RA latex turbid: 842.0 IU/mL, normal range: 0–20 IU/mL), anticyclic citrullinated peptide antibodies (anti-CCP level: 192 IU/mL, normal range: <30 IU/mL), and C-reactive protein (CRP level: 98.2 IU/mL, normal range: 0–0.8 IU/mL).