What is reactive leukocytosis? Among many other illnesses, I have severe copd (was on hospice for 3mo.) CHF & CKD stage 3 if this helps in any way.

Normal immune response. Reactive leukocytosis means you have more white blood cells then normal, and it's due to a reaction to an illness. It's not due to leukemia. Since you have COPD, you are probably taking prednisone. This is one of the main causes of reactive leukocytosis. Other causes include stress, infection, and inflammation.