Just got my cbc back and wbc is 3.1. lab cutoff is 3.5. the past two years my wbc was 3.6, so i tend to trend low. i've been reading about low wbc and cancer keeps popping up and i'm very worried. could this be an early cancer sign?

If your CBC typically has a WBC of 3.6, it is unlikely that 3.1 is an issue or cancer. I would recommend that you discuss this with your doctor as they would also know you, probably have examined you, and have the result of the whole CBC. It is important to look at the other results (types of WBC, hemoglobin, hematocrit, platelets, and other indices).

You are understandably worried. However, there are instances where individuals have low WBC with no other significance, as there are a variety of other conditions in which there is a degree of leukopenia associated (other than cancer or blood disorder), some drugs including over the counter notorious. A hematologist’s opinion may be needed along the way, your doc remains your best reference.

All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Talk to the doctor who ordered the tests. Having said that, your WBC and the change are not a cause for concern. Wish you good health!