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Abstract Turnaround time (called, TAT) for imaging test, which is necessary for making a medical diagnosis, isdirectly related to the patient's waiting time and it is one of the important performance criteria for medicalservices. In this paper, we measured the TAT from major imaging tests to see it met the reference point setby the medical institutions. Prediction results from the algorithm of classification regression tree (called, CART)showed "clinics", "diagnosis", "modality", “test month” were identified as main factors for timely processing.This study had a contribution in providing means of prevention of the delay on medical services in advance.         (turnaround time, TAT)      .      TAT ,        .     , “”, “”, “”, “”        .                  .Keywords:qualityofmedicalservice,turnaroundtime,CART,imagingtest,timelyprocessing* Dept. of Industrial and Information Systems, Seoul National University of Science and Technology.** The Catholic University of Korea. Uijeongbu St.Mary Hospital.

A Prediction Model of Timely Processing on Medical Service using Classification and Regression Tree