A REVIEW of the literature reveals a lack of data on the composition of turkey blood. Scott, Serfontein and Seiling (1933) reported analyses of blood samples from fifteen young Bronze turkeys. Neilsen and Madsen (1940) reported serum calcium and phosphorus levels for normal young turkeys. Dukes (1942) has included turkeys in a table of blood composition for various animals and birds, but his values appear to be those reported earlier by Scott, Serfontein, and Seiling (1933). Rhian, Wilson, and Moxon (1944) have published data on blood levels for Broad-Breasted Bronze turkey hens and toms. The blood samples were taken at the close of the 1943 egg production season (June 14 to August 13).The data reported herein are based on samples taken from young turkeys in December 1943 before the hens started laying and at four-week intervals throughout the laying season. Data are also included for turkey hens sampled before they .