*  radioimmunoassay
    *  radioisotope dilution technique
    *  radioligand assay
    *  radionuclide imaging
    *  absorptiometry, photon
    *  radioimmunodetection
    *  radionuclide angiography
    *  radioisotope renography
    *  radionuclide ventriculography
    *  gated blood-pool imaging
    *  ventriculography, first-pass
    *  tomography, emission-computed
    *  positron-emission tomography
    *  tomography, emission-computed, single-photon
    *  schilling test