What Is a Blood Group & Rh Phenotype Profile?
A Blood Group & Rh Phenotype Profile goes beyond standard ABO and Rh(D) typing to provide a comprehensive analysis of your red blood cell antigens. While a basic blood group test determines your ABO type and whether you are Rh-positive or Rh-negative, a full phenotype profile tests for multiple additional antigens in the Rh system (C, c, E, e) and other clinically important blood group systems (Kell, Duffy, Kidd, MNS).
Extended phenotyping is particularly important for patients who may require multiple blood transfusions, as exposure to foreign antigens can cause alloimmunisation — the development of antibodies against donor red cell antigens that are not present on the patient's own cells.
Why Is Extended Phenotyping Important?
- Transfusion safety: Patients with sickle cell disease, thalassaemia, or myelodysplastic syndromes need phenotype-matched blood to reduce alloimmunisation risk
- Pregnancy management: Identifies mothers at risk of haemolytic disease of the fetus and newborn (HDFN) beyond anti-D
- Pre-surgical planning: For complex surgeries with high transfusion requirements
- Antibody investigation: When unexpected antibodies are found during crossmatching
- Autoimmune haemolytic anaemia: Extended phenotyping helps select compatible blood when autoantibodies complicate crossmatching
- Personal health record: Knowing your full phenotype provides valuable information for any future medical needs
What Does the Profile Include?
| System | Antigens Tested | Clinical Significance |
|---|---|---|
| ABO | A, B | Primary transfusion compatibility |
| Rh (extended) | D, C, c, E, e | Most common cause of alloimmunisation after ABO |
| Kell | K, k | Highly immunogenic — anti-K causes severe HDFN |
| Duffy | Fya, Fyb | Important for transfusion; Duffy-negative protects against P. vivax malaria |
| Kidd | Jka, Jkb | Anti-Kidd antibodies can cause delayed transfusion reactions |
| MNS | M, N, S, s | Occasionally causes transfusion reactions and HDFN |
Understanding Rh Phenotypes
The Rh system has five main antigens (D, C, c, E, e). Common Rh phenotypes in the UK include:
- R1r (DCe/dce): Most common Rh-positive phenotype in Caucasians (~35%)
- R1R1 (DCe/DCe): Common, ~18% of Caucasians
- R2r (DcE/dce): Common, ~13% of Caucasians
- rr (dce/dce): Most common Rh-negative phenotype, ~15% of Caucasians
- R0r (Dce/dce): More common in people of African descent; important for sickle cell patients
Who Needs Extended Phenotyping?
- Sickle cell disease patients: Extended matching significantly reduces alloimmunisation (from 30% to 5%)
- Thalassaemia patients: Regular transfusion recipients need phenotype-matched blood
- Women of childbearing age: Preventing alloimmunisation protects future pregnancies
- Patients with multiple antibodies: Full phenotyping helps find compatible donors
- Bone marrow or stem cell transplant candidates: Pre-transplant phenotyping is essential
- Anyone wanting detailed blood type information
When Should You Get Tested?
- You have a condition requiring regular blood transfusions
- You are planning pregnancy and want to know your full Rh phenotype
- You have been told you have unexpected blood group antibodies
- You want a complete record of your blood group antigens for medical purposes
- You are of African, Asian, or Middle Eastern descent (higher frequency of variant Rh phenotypes)
Check Your Blood Group & Rh Phenotype Profile Levels at Home
The Core Health 45 includes Blood Group & Rh Phenotype Profile testing along with 44 other biomarkers. Results in 2 working days with a free at-home phlebotomist visit.
View Core Health 45 →Which Lola Health Tests Include This Profile?
Blood Group & Rh Phenotype profiling is available as an add-on with Lola Health tests:
Get Your Complete Blood Group Profile
Get a thorough blood test from Lola Health with GP-certified results and personalised recommendations. All tests use venous blood draws for medical-grade accuracy.
At-Home Blood Testing
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