The SaberVet Bovine pregnancy Rapid test is a qualitative test. It detects the presence of pregnancy-associated glycoproteins (PAGs) in the peripheral blood of ruminants after pregnancy using a double-antibody sandwich system on a nitrocellulose membrane. During the test, the PAGs in the blood of cattle binds with a gold label and then binds with the antibody on the test line, showing a purple band. If the sample does not contain PAGs, no color reaction occurs.