Genes & pathways

Gene & pathway reference · FROM DR. PURSER’S TEACHING

F9

F9 encodes coagulation factor IX. Disease-causing variants can result in hemophilia B, an inherited bleeding disorder, but a panel marker is not equivalent to a confirmed disease-causing finding.

Updated Sep 23, 2026 · Educational reference

THE TEACHING CONNECTION

Factor IX and the bleeding side of coagulation

Factor IX and the bleeding side of coagulation

F9 encodes coagulation factor IX. Disease-causing variants can result in hemophilia B, an inherited bleeding disorder, but a panel marker is not equivalent to a confirmed disease-causing finding.

How Dr. Purser connects the pieces

Dr. Purser’s notes point readers toward hematology when factor IX dysfunction is suspected. Easy bruising, prolonged bleeding, joint bleeding or a family history should be assessed with the appropriate clotting tests. The listed rs6048 marker alone must not be read as proof that factor IX is absent.

A question to bring to your visit

Is there a measured factor IX problem or a pathogenic finding that needs hematology review?

Variant lookup

These teaching identifiers include regional research markers. Match them to your original laboratory report; listing alone does not establish clinical significance or a treatment need.

Names you may see

Factor IX