What causes a low white blood cell count?

1 answer | Last updated: Nov 11, 2016
Stef asked...

My 45 year-old healthy husband has a low white blood cell count. What could this be?

Expert Answers

Jennifer Serafin, N.P. is a registered nurse and geriatric nurse practitioner at the Jewish Homes for the Aged in San Francisco.

A low white blood count (below 4000) could have many causes.  The most common would be medication side effects (like chemotherapy), heavy metal exposure, infections, bone marrow disorders, or an immune system disorder. 

Hopefully, your husband will be referred to a hematologist, so that the reason for his low white count can be explored.