ABO Blood Group & Rh Type
Here’s what it reflects — and what to do about it.
Longetic pulls together every lab and record you’ve had, follows how ABO Blood Group & Rh Type changes over time, and explains what’s shifting — so you walk into your next appointment prepared, with reminders for retests along the way.
What is ABO Blood Group & Rh Type?
A test that identifies your blood type (A, B, AB, or O) and whether you are Rh positive or negative.
Blood typing identifies which ABO antigens (A, B, both, or neither) sit on your red blood cells and whether the Rh factor is present, giving results like A positive or O negative. Your blood type is inherited and does not indicate illness; it matters mainly for safe blood transfusions, transplants, and during pregnancy. Knowing your type ahead of time helps care teams match blood quickly if it is ever needed.
What to know about ABO Blood Group & Rh Type
Understanding ABO Blood Group & Rh Type means knowing what it reflects, what tends to move it, and the signs that suggest it’s worth a closer look — so you can bring the right questions to your next appointment.
This glossary entry is for informational purposes only and is not a substitute for professional medical advice. Read our Medical Disclaimer.
References
About our sources
Official sources
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Peer-reviewed research
Original research articles and systematic reviews published in indexed journals and verified through PubMed or DOI.