How do you find out your blood type?
The easiest way is to donate blood: the American Red Cross and most centers tell you your type. You can also ask your doctor for a blood typing test or check old medical records.
Many people do not know their blood type until they need it. There are simple ways to find out.
Ways to find out
1. Donate blood
Blood centers test every donation for type. The Red Cross and other organizations let you see your blood type in their donor app or on your donor card after your first donation.
2. Ask your doctor for a blood typing test
Your doctor can order a blood typing test at a lab. Costs vary with your insurance and the lab.
3. Check your medical records
- Prenatal records: blood type is checked routinely in pregnancy
- Hospital or surgery records: hospitals record your type
- Military records and some ID or medical cards list blood type
4. Home kits
At-home blood typing kits exist. Results are indicative and do not replace a validated lab test. Do not rely on them in emergencies.
Why it matters
- Emergencies: knowing your type can speed up safe transfusion
- Pregnancy: Rh negative mothers need special monitoring if the baby is Rh positive
- Donation: knowing your type helps you respond when centers need a specific type
This information is general and does not replace advice from a health professional. Your eligibility is always decided at the donor screening on the day of donation. Rules change, so confirm with the American Red Cross or the blood center where you plan to donate.