Blood types are determined by the presence or absence of certain antigens – substances that can trigger an immune response if they are foreign to the body. There are four main blood groups: A, B, AB, and O. Additionally, blood is classified by the Rhesus (Rh) factor – another antigen on the surface of red blood cells. If this antigen is present, the blood type is positive (+); if absent, it's negative (-).
This chart shows basic ABO and Rh compatibility for red blood cell transfusions. Actual transfusion decisions require proper blood typing, compatibility testing, and clinical assessment.
| Blood Type | Can Donate To | Can Receive From |
|---|---|---|
| A+ | A+, AB+ | A+, A-, O+, O- |
| A- | A+, A-, AB+, AB- | A-, O- |
| B+ | B+, AB+ | B+, B-, O+, O- |
| B- | B+, B-, AB+, AB- | B-, O- |
| AB+ | AB+ only | All blood types (Universal Receiver) |
| AB- | AB+, AB- | A-, B-, AB-, O- |
| O+ | A+, B+, AB+, O+ | O+, O- |
| O- | All blood types (Universal Donor) | O- only |
Before donating blood, donors must meet certain eligibility criteria to ensure the safety of both the donor and the recipient. Here are some general requirements:
In India, eligible whole-blood donors are generally 18 to 65 years old, subject to the blood centre's medical screening and applicable guidelines.
Donors should generally weigh at least 45 kg. The amount collected can depend on the donor's weight and the applicable blood-centre guidelines.
Donors should be in good health and undergo the required screening before donation.
Hemoglobin should be at least 12.5 g/dL before donation, subject to the blood centre's screening requirements.
Donation intervals in India depend on the type of donation and applicable blood-centre guidelines. The blood centre will determine when you are eligible to donate again.
Travel to certain countries may temporarily disqualify you from donating blood due to potential exposure to malaria or other diseases.
For whole blood donations, you can donate once every 8 weeks (56 days). For double red cell donations, you can donate once every 16 weeks (112 days). For platelet donations, you can donate once every 7 days, up to 24 times per year.
Most people report only a brief pinch when the needle is inserted. The actual donation process is usually painless. Our trained staff will make sure you're comfortable throughout the process.
The entire process takes about one hour, though the actual blood donation only takes about 8-10 minutes. The rest of the time is spent on registration, a mini-physical, and refreshments after donation.
Yes, it is completely safe to donate blood. All equipment used for blood donation is sterile and used only once. There is no risk of contracting any disease by donating blood.
It's recommended to have a healthy, iron-rich meal before donating blood. Foods high in iron include red meat, spinach, beans, and fortified cereals. Also, drink plenty of water before your donation.