The main purpose of this study was to introduce the two methods by the present author and the maximum likelihood estimate method applicable to the determination of normal ranges of ESR from the routine laboratory data. At first the basic principles of the three methods were explained, and then their application to practice were illustrated by estimating normal ranges of ESR from complete and artificially truncated gambles obtained from 309 normal Korean adult women. At last an attempt was made to estimate normal ranges of ESR from the laboratory data of Pusan National University Hospital, and values of upper limit of 95% range were gained, ranging between 16 and 21mm/hour in women and between 14 and 18mm/hour in man.