Z67.A1

Clinical Causes: Genetic inheritance - passed down from parents through specific gene variants Mutations in the ACKR1 gene that encode the Duffy antigen protein Population-specific genetic traits found more frequently in individuals of African descent

Key Symptoms: Typically, Duffy null individuals are asymptomatic regarding physical health Possible increased resistance to certain strains of malaria caused by Plasmodium vivax No direct physical symptoms are associated solely with Duffy null status

Diagnosis Path: Duffy null status is usually identified through blood testing, specifically by evaluating the presence or absence of Duffy antigens on the surface of red blood cells. Laboratory techniques include serologic testing and molecular genetic testing to determine the phenotype. Blood banks may perform antigen typing to confirm the Fy(a-b-) phenotype, especially before transfusions.

Treatment Protocols: Since Duffy null is an inherited trait rather than a medical condition or disease, there is generally no treatment required. Awareness of this phenotype is important for transfusion medicine to avoid transfusion reactions and to understand susceptibilities to certain diseases. If blood transfusions are needed, compatible blood that matches the Duffy antigen profile is selected to prevent adverse reactions.