Elevation of the sedimentation rate (SR) is a sensitive indicator in a host of ailments. As a general warning of organic troubles, it surpasses most other tests. While the SR test does not aid in the etiologic diagnosis of an individual case of uveitis, a study of it in a large series of uveitis patients is of possible interest in regard to the general subject of etiology and pathogenesis of uveitis. Method Four hundred ninety-one endogenous uveitis patients receiving a complete etiologic examination had a SR performed on the first visit by the method of Wintrobe.1 SR values of 10 mm per hour and below in males were considered normal, those from 11-15 discarded, and those 16 and up called abnormal. In female patients 0-20 was considered normal, values of 21-25 were discarded, and 26 and up called abnormal. The frequencies of normal and abnormal SR values were correlated