T80.911A Delayed hemolytic transfusion reaction, unspecified incompatibility, initial encounter

Name of the Condition

• Delayed Hemolytic Transfusion Reaction, Unspecified Incompatibility, Initial Encounter

Summary

Delayed hemolytic transfusion reaction (DHTR) with unspecified incompatibility is an immune-mediated adverse event occurring days to weeks after a blood transfusion, where red blood cells are destroyed due to unrecognized incompatibility. This code is used for initial encounters when the specific cause of incompatibility is not documented.

Causes

DHTR typically results from an immune response where the recipient’s antibodies attack donor red blood cells, often due to prior sensitization from previous transfusions or pregnancies. The exact incompatibility (e.g., non-ABO antigens) is not specified in this code.

Risk Factors

• Prior transfusion history leading to alloantibody formation.
• Underlying conditions like sickle cell disease or thalassemia.
• Receiving blood products from multiple donors.
• Lack of recent crossmatching or typing.

Symptoms

• Fever or chills.
• Jaundice or yellowing of the skin.
• Dark urine (hemoglobinuria).
• Fatigue or weakness.
• Elevated bilirubin levels.
• Mild anemia.

Diagnosis

Diagnosis involves evaluating delayed symptoms post-transfusion, laboratory tests (e.g., direct antiglobulin test, bilirubin, reticulocyte count), and reviewing transfusion history. Documentation of the reaction and timing is critical.

Treatment Options

• Supportive care (e.g., hydration, monitoring).
• Managing anemia if severe.
• Addressing underlying causes (e.g., discontinuing transfusion).
• Immunologic evaluation to identify antibodies.

Prognosis and Follow-Up

Most DHTR cases are mild and resolve with supportive care. Follow-up includes monitoring hemoglobin levels and bilirubin, with repeat testing if symptoms persist. Severe cases may require additional interventions.

Complications

• Severe anemia requiring transfusion.
• Acute kidney injury (rare).
• Prolonged jaundice.
• Delayed recovery due to ongoing hemolysis.

Lifestyle & Prevention

• Ensure accurate blood typing and crossmatching before transfusion.
• Maintain updated transfusion records.
• Screen for alloantibodies in high-risk patients.
• Educate patients on reporting delayed symptoms post-transfusion.

When to Seek Professional Help

Seek immediate care if symptoms like fever, dark urine, or jaundice occur after a transfusion, especially if they worsen or persist.

Tips for Medical Coders

Document the timing of symptoms (delayed onset), transfusion details, and lack of specified incompatibility. Ensure "initial encounter" is confirmed to use this code. Include clinical notes supporting the diagnosis.