Factor XII (FXII) deficiency is a rare autosomal recessive disorder characterized by prolonged activated partial thromboplastin time (APTT) without bleeding diathesis. Genetic diagnosis is critical to avoid unnecessary interventions. An 8-year-old boy with incidentally prolonged APTT (> 170 s) was referred for preoperative evaluation. FXII activity was 7.7%. No personal/family history of bleeding or thrombosis was reported. Genetic testing revealed F12: c.1092dup homozygous mutations in F12, inherited from his parents. Familial segregation confirmed autosomal recessive transmission. The identification of these mutations expands our understanding of the genetic basis of factor XII deficiency and emphasizes the importance of genetic diagnosis in such cases.
Keywords: FXII gene; Frameshift mutation; Human coagulation factor XII deficiency; Pedigree.
© 2025. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.