Blood Group (ABO+Rh)
Discover your blood type for health and peace of mind.
What’s tested
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The Blood Group test determines your blood type based on certain markers, called antigens, on the surface of your red blood cells. It identifies both your ABO type (A, B, AB, or O) and your Rh factor (positive or negative), giving your complete blood group, for example O positive or AB negative.
The ABO system
The ABO system classifies blood into four main types, based on the antigens on your red blood cells and the antibodies naturally present in your plasma:
- Type A: A antigens on the cells, anti-B antibodies in the plasma
- Type B: B antigens on the cells, anti-A antibodies in the plasma
- Type AB: both A and B antigens, with neither antibody (the universal recipient)
- Type O: neither antigen, with both anti-A and anti-B antibodies (the universal donor)
The Rh system
The Rh system classifies blood by the presence or absence of a further antigen called the Rhesus D factor (RhD):
- Rh-positive: the RhD antigen is present
- Rh-negative: the RhD antigen is absent
Why it matters
Knowing your blood group is valuable for:
- Blood transfusions: matching a compatible blood type is essential, as incompatible blood can cause a serious reaction.
- Pregnancy: an Rh-negative mother carrying an Rh-positive baby may need anti-D injections to prevent a reaction that could affect the pregnancy or future pregnancies.
- Organ and tissue matching: compatible blood typing helps reduce the risk of rejection in transplants.
- Knowing your details: having your blood group on record is useful in medical emergencies and for donating blood.
No special fasting required. Drink plenty of water prior to your appointment for a smooth blood draw.
This test provides an official, quality-assured laboratory report with reference ranges. These results are for clinical information and do not replace your GP or consultant. Always discuss abnormal results with your GP or specialist in the context of your medical history.
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