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We have advocated the use of a 5-category "normal," "probably normal," "equivocal," "probably abnormal," and "definitely abnormal" approach to final interpretation of myocardial perfusion single-photon emission computed tomography (SPECT). The prognostic value of expressing levels of certainty compared with a dichotomous normal/abnormal classification or categories for summed stress scores is unclear.

Are Shades of Gray Prognostically Useful in Reporting Myocardial Perfusion Single-Photon Emission Computed Tomography?