An evaluation of the rosette inhibition test in Crohn's disease.

Serial rosette inhibition tests were performed on nine patients with Crohn's disease undergoing immunosuppressive therapy in an attempt to estimate the minimum amount of drug necessary to maintain immunosuppression. The rosette inhibition titre was found to be higher in immunosuppressed patients than in normal subjects. However, there was no consistent correlation of the rosette inhibition titre with the degree of activity of the disease. The test is therefore not sufficiently discriminative to be used as a basis on which to control drug dosage.