本文对93倒流行性出血热探讨了血清C_4检测的临床意义,结果表明出血热患者低血压、少尿期C_4明显下降,重症组比轻症组更为显著,提示出血热极期有补体经典途径的激活,C_4下降幅度可反映病情的轻重,部分患者尚有补体替代途径的激活,但后者不占主要地位。 In this paper, the clinical significance of serum C_4 detection in 93 down-haemorrhagic fever was explored. The results showed that the blood pressure and oligosuria C_4 in hemorrhagic fever patients were significantly decreased, more severe in severe cases than in mild cases, suggesting that there is complement classic Pathway activation, C_4 decline can reflect the severity of illness, some patients still have alternative activation of complement activation, but the latter does not dominate.