A multicentre prospective observational study showed that a cut‐off value of serum PCT > 0.25 ng/mL had a sensitivity of 87% and a specificity of 79% and was a better biomarker than CRP and leukocytes in differentiating acute pyelonephritis from asymptomatic bacteriuria and acute cystitis in pregnancy.22 Here, CRP is linked to acute cystitis.