Sukhonthamarn et al. examined acute PJI within 90 days and determined a CRP threshold for PJI of 39.8 mg/l with a sensitivity of 91% and specificity of 87% which changed only slightly within 45 (44.9 mg/l, Sens.: 82%, Spec.: 89%) and 30 days (50.7 mg/l, Sens.: 82%, Spec.: 90%) [15]. The gene discussed is CRP; the disease is juvenile polyposis syndrome.