Definition: An instrument used to measure the diffraction halo of a red blood cell; based on the premise that the halo of the large erythrocyte of pernicious anemia is smaller than that of the normal cell; the hazy colorless halo of normal size is characteristic of secondary anemia.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.