Potential pitfalls of comparative measurements of reticulocytes with flow cytometry and microscopy in prematures and infants.

Reticulocyte counting by flow cytometry (Bayer H*3, ADVIA 120) in blood of prematures, infants and children > 1 year of age was compared with microscopic counting under research conditions (9000 counted red blood cells per slide). While in children >1 year a good concordance of both methods was observed, 2.3-2.