What Is the CD4:CD8 Ratio Test Used For? CD4 and CD8 are two types of white blood cells in your blood. White blood cells help your body fight infections. If you have HIV infection, your doctor may use ...

This simple blood test measures the two main proteins in your blood. A high reading may indicate issues such as severe hydration or a weakened immune system. A serum albumin and globulin (A/G) ratio ...