That can show what kind of cell it is. A flow cytometry test starts with either a blood sample or a sample of your tissue or bone marrow that a doctor removes during a biopsy. A lab worker mixes ...

Bone marrow is a spongy tissue found inside ... eosinophils, and basophils. Monocytes: These white blood cells turn into macrophages, which eat foreign cells. Platelets. These cells make your ...