A diversity of radioisotope methods for estimating red cell sur vival have been available for almost two decades. Details of a standardized procedure, specially adapted for pediatricians from the report of an International Committee for Standardization in Hematology, are here described, together with comments. Platelet survival studies, much more recently developed, represent an important clinical test which should be available at every chil dren's hospital. A procedure for platelet survival studies is outlined.
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