RÉSUMÉ
【Objective】 To retrospectively analyze the clinical manifestations and laboratory characteristics of 7 patients with coagulation factor Ⅻ deficiency in our hospital from February 2016 to January 2020 in order to improve the understanding of diagnosis and treatment for the diseases. 【Methods】 The clinical data of 7 patients with coagulation factor Ⅻ deficiency were analyzed, and related literatures were reviewed. 【Results】 All the 7 patients showed significantly prolonged APTT without bleeding or thrombosis. Among them, 1 had a positive family history, and 1 acquired coagulation factor Ⅻ deficiency secondary to the tumor. 【Conclusion】 It is very necessary to comprehensively screen related internal and external coagulation factors and acquired factors in patients with prolonged APTT but no bleeding, so as to avoid missed diagnosis, misdiagnosis and over treatment.