Congenital Factor X-Riyadh (Stuart-Prower) Deficiency With Isolated Prothrombin Time Prolongation: A Case Report.

Factor X (FX) deficiency is an extremely rare autosomal recessive inherited coagulation defect. We report a case of congenital Factor X-Riyadh deficiency discovered during a routine workup before a dental procedure. During routine work-up for dental surgery, prothrombin time (PT) and the international normalized ratio (INR) were prolonged.