The page below is a sample from the LabCE course Introduction to the ABO Blood Group System. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

Learn more about Introduction to the ABO Blood Group System (online CE course) »
How to Subscribe
MLS & MLT Comprehensive CE Package
Includes 97 CE courses, most popular
$95 Add to cart
Pick Your Courses
Up to 8 CE hours
$50 Add to cart
Individual course$20 Add to cart

Strength of the A Antigen

The strength of the A antigen can vary considerably, and although most A cells react strongly with anti-A and anti-A1B, some cells have been found that are weakly reactive. The blood group has been divided into subgroups and is classified not only by the strength of the A antigen but also by certain other serologic characteristics.