A-
High Demand
A Negative Blood Type: Rare Donor Guide for Oklahoma
Rare and versatile — A− donors are always needed.
6%
of Oklahomans have A− blood
Your blood is in high demand at Oklahoma donor centers.
Quick Facts
Prevalence in Oklahoma
~6% of population
Can donate to
A+, A−, AB+, AB−
Can receive from
A− and O−
Most needed for
Rh-negative patients who need A-type blood
Donation frequency
Whole blood every 56 days
A negative (A−) is carried by approximately 6% of Oklahomans, making it one of the rarer blood types in the state. Despite its low prevalence, A− red blood cells can be donated to both Rh-positive and Rh-negative A and AB patients — covering four of the eight blood types. This versatility makes A− a valuable type for hospital blood banks.
A− is particularly critical for Rh-negative patients who require A-type blood. Rh-negative patients cannot receive Rh-positive blood without risk of serious immune reactions, and they represent about 15% of the population. For A− patients who need transfusions, only A− and O− blood can be safely used — making A− donations vital for this subgroup.
A− plasma follows different compatibility rules and can be given to A−, A+, and O− patients. Because A− donors are less common, Oklahoma Blood Institute centers actively recruit A− donors and may contact you directly when supplies run low. If you're A−, your donations have an impact that outweighs your rarity.
Compatibility Chart for A-
| Blood Type | A- Can Donate To | A- Can Receive From |
|---|---|---|
| O- | — | ✓ |
| O+ | — | — |
| A- | ✓ | ✓ |
| A+ | ✓ | — |
| B- | — | — |
| B+ | — | — |
| AB- | ✓ | — |
| AB+ | ✓ | — |
Common Myths About A- Blood
Myth: "A− isn't special because it's not universal."
Fact: A− is the only compatible type for A-negative patients who need red blood cells and can't receive Rh-positive blood. For those patients, A− donations are life-critical.
A− donors are always in demand. Your rare blood type makes a critical difference.