Mid cells are cells that fall in a particular size range. The
percentage and absolute counts are determined for lymphocytes,
neutrophil, and mid-size population of monocytes, basophils,
eosinophils, blasts, and other immature cells.
I would suggest that you call your doctor and ask for an explanation and next steps if there are any. We are not doctors, nor do we have access to your medical records. Remember, they work for you so before you leave their office be sure that you understand everything that was discussed.
