Does stress affect CBC test results?

Yes, stress can affect certain components of a CBC test. High levels of stress or anxiety can cause an increase in white blood cell (WBC) counts, as your body may perceive stress as a trigger for immune response. Additionally, stress can lead to a temporary rise in certain white blood cell types, such as neutrophils. If you're particularly stressed at the time of the test, it’s a good idea to inform your doctor. While temporary stress-induced fluctuations aren’t usually concerning, it’s important for your healthcare provider to be aware so they can interpret your results accurately.