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Blood Type
LOINC 882-1 · ratio
What it is
Your blood type describes markers on your red blood cells — the ABO group (A, B, AB or O) and the Rh factor (positive or negative).
Why it matters
It is essential for safe blood transfusions and is important during pregnancy for Rh compatibility.
What high values can mean
Blood type is not "high" or "low" — it is a fixed characteristic you are born with.
What low values can mean
Blood type is not "high" or "low" — it is a fixed characteristic you are born with.
How to improve it
Blood type does not change and is not affected by lifestyle; it is simply good to know and record.
Food & lifestyle
No food or lifestyle changes your blood type; popular "blood-type diets" are not supported by evidence.
Preparing for the test
A one-time blood test; fasting is not required — follow your lab's instructions.
When to talk to a doctor
Knowing your blood type is useful for emergencies and pregnancy; discuss Rh status with your doctor if pregnant.
Sources
- MedlinePlus (NIH)
- American Red Cross
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
See your own values in context
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