Test library
Rh Factor and Blood Type Test
A blood type test determines your ABO group and Rh factor from a blood sample. It identifies whether you are A, B, AB, or O and whether you are Rh positive or Rh negative.
Order Blood Type Test
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Blood Type Test- Typical turnaround
- 1-3 business days
- Starting price
- From $49
- Results
- Confidential, online
Quick answer
A blood type test identifies your ABO blood group and your Rh factor using a blood sample. The ABO system classifies blood as type A, B, AB, or O, and the Rh system adds a positive or negative marker. Knowing your blood type is useful for transfusion compatibility, pregnancy care, and personal records, and the test itself is a quick laboratory analysis of red blood cell antigens.
What this test measures
Blood type is determined by antigens, which are proteins and sugars on the surface of red blood cells. The ABO system has four main groups based on which A and B antigens are present. Type A has the A antigen, type B has the B antigen, type AB has both, and type O has neither. These antigens matter because the immune system can react against blood cells that carry unfamiliar markers.
The Rh system is a separate group of antigens, and the most important is the D antigen. People who have it are described as Rh positive, and those who lack it are Rh negative. The test uses a blood sample, often collected in a tube with an anticoagulant, and the laboratory mixes the red cells with known reagents to see which antigens are present. Results are reported as a combined type, such as A positive or O negative.
Blood typing is commonly performed before a transfusion, during pregnancy, and before some surgical procedures so that compatible blood can be prepared if needed. Many people also order it simply to know their own type. The test is a laboratory determination and not a diagnosis, and a qualified healthcare provider can explain how your blood type relates to your care.
- ABO blood group (A, B, AB, or O)
- Rh D antigen status (positive or negative)
- Forward ABO typing (red cell antigens)
- Reverse ABO typing (plasma antibodies)
- A and B red cell antigens
- Rh factor, including weak D when indicated
Why people order this test
- Learn your ABO blood group and Rh factor
- Prepare for transfusion compatibility checks
- Support prenatal and pregnancy care
- Provide blood type information before surgery
- Confirm a blood type for personal or donor records
- Resolve a discrepancy between previously reported types
How to prepare
No fasting is required for a blood type test. A blood sample is collected from a vein, usually at the arm, and the laboratory performs the analysis. Follow any specific instructions provided by the collection site.
Understanding your results
Results are typically available within one to three business days. The report states your ABO group and Rh status, such as A positive or O negative. If a result is unclear, the laboratory may repeat or extend the testing to confirm it.
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Frequently Asked Questions
What does a blood type test tell me?
It reports your ABO group and whether you are Rh positive or negative. Together these describe which blood cell antigens are present.
How is blood type determined?
The laboratory mixes your red blood cells with known reagents and checks for reactions that reveal which antigens are present.
Do I need to fast?
No. Fasting is not required for blood typing unless it is combined with another test that calls for it.
Can my blood type change over time?
Your ABO and Rh type are inherited and generally stay the same. Rare situations such as a stem cell transplant can change blood cell antigens.
Is a doctor's referral needed?
Requirements vary. Many laboratory orders can be placed directly, and a qualified healthcare provider can discuss whether testing is appropriate for you.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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Every page on this site is reviewed for clarity, sourcing, and accuracy. We update our library as testing options, collection networks, and accreditation standards change.