细菌感染性疾病泛指细菌在体内繁殖引起全身炎症反应综合征的一类疾病，是感染科最常见的疾病之一。近年来，降钙素原(PCT)检测在早期诊断、指导抗生素早期使用、评估疾病严重程度及判断预后等方面具有十分重要的临床价值，本文就此进行综述。

Bacterial infectious diseases, caused by bacteria in the body and giving rise to systemic inflammatory response syndrome, are one of the most common diseases in infectious department. Procalcitonin (PCT) is an important clinical index for early diagnosis, assessment of severity of disease, drug selection and prognosis. Current research and clinical progress in these directions are reviewed in the present paper.