5 Ways To Tell If Your Immune System Is Strong (Besides Getting Sick)

“A complete blood count (CBC) would for sure be [your] No. 1 baseline to see if there’s any dysfunction with any of your major classes of immune cells,” says Ferira. While this test measures all different features of your blood, including red blood cells, white blood cells, platelets, hemoglobin, and hematocrit, the white blood cell portion can be super telling: Different types of white blood cells (like neutrophils, lymphocytes, basophils, etc.) can shed light on your immune response. 

Says Ferira: “We know, for instance, neutrophils increase when you have an infection.” That said, a CBC test may be able to highlight these different responses and offer up some information.