The differential count at high altitudes

Abstract 1.1. Our findings agree with those of other writers that a relative-lymphocytosis occurs at high altitudes. 2.2. This means a decrease of from 10 to 14 per cent in the polymorphonuclears in contrast to what might be expected at sea level, which fact must be taken into consideration when making a diagnosis or prognosis. 3.3. A slight increase (0.34 per cent) in eosinophiles was found in the counts taken during the spring months as compared to those taken during the winter months. 4.4. Thirteen per cent of the group of 100 healthy young persons are found to have a total leucocytic count over the usually accepted upper normal limit of 10,000.