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The Application of Rapid ^99mTc-Pertechnetate Scintiphotographic Placental Imaging During Third Trimester Bleeding

From the Obstetric and Gynecology Service and the Nuclear Medicine Section of the Clinical Laboratories, San Francisco General Hospital, and the Department of Obstetrics and Gynecology and Division of Clinical Pathology and Laboratory Medicine, University of California School of Medicine, San. Francisco, Calif.

Abstract

Rapid scintiphotographic placental imaging using free ^99mTc-pertechnetate ion was performed in 96 women, 82 of whom had third-trimester bleeding classified as "mild" or "moderate." Results of localization were expressed as "not placenta previa," "equivocal for previa," or "placenta previa," and these classifications included 82, 8, and 6 patients, respectively. There were no false-positive or false-negative localizations; placenta previa occurred only in the moderate-bleeder group; and 2 of the 6 patients with placenta previa were adolescent primigravidas. Fetal radioisotope exposure was minimal. Scintiphotography using ^99mTc-pertechnetate eliminates confusion caused by active bleeding or bladder accumulation of isotope and permits more accurate localization than do other methods now in use.