A h . These studies were supported by funds from the National I d t u t e of Arthritis and Metabolic Diseases, National Institutes of Health, U.S.P.H.S., and the A. H . Robins Company, Inc. Three of the authors (A. V., L. L. H. and J. H . McN.) are Trainees of the X&nal Institute of Arthritis and Metabolic Diseases, National Institutes of Health, U.S.P.H.S.
114ADRENAL CORTICAL ACXIVITY M RHEUMATOID ARTHRITIS 115 els have been found by several investigators,l2*21-23 while another reported low pIasma corticoid concentrations.2* Still another study demonstrated values in the upper limits of normal using the blue tetrazolium and phenylhydrazine reactions. These were associated with high absolute and relative values for "F-like" substances in plasma.2s These and other performed on patients with rheumatoid arthritis suggest that while gross adrenal cortical secretory activity is apparently within normal limits, subtle, yet signScant, deviations from normal may occur.Many of the foregoing studies have utilized changes in urinary 17-ketosteroid or unconjugated ll-oxy-or 17-hydroxycorticosteroid levels as indicators of adrenal cortical activity. It is now well appreciated that these indexes are either not entirely s p e d c (urinary excretion of 17-ketosteroids in males) or only partial (unconjugated corticosteroid levels) indicators of adrenal cortical activity. The availability of more precise technics for meas-