Duffy b positive

This code indicates the presence of the Duffy b antigen on red blood cells, a specific blood group phenotype. The Duffy blood group system is important in transfusion medicine and can be relevant in certain genetic or disease susceptibility contexts.

This code is used when documentation specifically identifies a patient as Duffy b positive, typically determined through blood typing. This may occur during pre-transfusion testing, workup for hemolytic disease of the newborn, or in the context of genetic studies.

• Ensure the medical record explicitly states "Duffy b positive" from laboratory results.
• Do not infer this status; direct documentation is required.
• This code is for the presence of the antigen, not for testing or screening itself.