This statement is true. The Vel blood group system (ISBT 034) consists of a single high-frequency antigen, Vel. The Vel-negative phenotype is very rare (about 1 in 4000 in some populations) and is more common in individuals of Northern European descent. Anti-Vel is an IgG antibody that can be naturally occurring or immune-stimulated. It is considered **clinically significant** and has been implicated in both severe immediate and delayed hemolytic transfusion reactions, as well as Hemolytic Disease of the Fetus and Newborn (HDFN). Finding compatible Vel-negative blood for a sensitized patient can be challenging and often requires contacting rare donor registries. This underscores the importance of identifying such antibodies during pre-transfusion testing.

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Zambia

• Joseph Soko – 101 pts

• Visual Pathway Lesions
• Positive and Negative Symptoms
• Hallucinations and Delusions
• Antipsychotic Medications
• Emergency: Environmental Emergencies