A test that measures the number of a special type of white cells called CD4 cells (T-cells) that help the body fight infections
Clinical Trials
INTERNATIONAL VERSIONS OF THE SITE
Merck & Co, Inc, Rahway, NJ, USA, known as MSD outside of the United States and Canada, provides international versions of this site for both healthcare professionals and the general public.
Select a language below to be redirected to the MSD version of the site in your chosen language.