A method for evaluating the thyroid uptake function, based on the work of De Garreta, Williams, Glass, Atkins, Higgins et al., was developed using 99mTc-pertechnetate and a scintillation camera connected to a minicomputer system. The method has the advantages of a single visit, a low-dose examination, and the reliability of a full automated technique. The clinical results of the studies performed to date are in close correlation with those obtained from the radioactive iodine uptake test, and in good agreement with the findings of the above-mentioned authors.