PT - JOURNAL ARTICLE AU - Larry J Smith AU - Donna D Castellone AU - Michael A Nardi TI - Hemophilia: Where are we today? AID - 10.29074/ascls.118.001271 DP - 2019 Jan 01 TA - American Society for Clinical Laboratory Science PG - ascls.118.001271 4099 - http://hwmaint.clsjournal.ascls.org/content/early/2019/03/28/ascls.118.001271.short 4100 - http://hwmaint.clsjournal.ascls.org/content/early/2019/03/28/ascls.118.001271.full AB - Hemophilia is a rare congenital bleeding disorder characterized by decreased levels of coagulation factor VIII or factor IX in the circulation. The disorder is associated with lifelong bleeding that ranges from mild to severe in affected individuals. Treatment requires replacement of the missing factor and is often associated with the development of antibodies that may exacerbate the bleeding diathesis seen in these individuals. The clinical laboratory plays a unique role in the diagnosis of hemophilia and in monitoring the effectiveness of standard replacement therapy, as well as many of the newer replacement therapies that have been developed.