Heterophilic Antibodies Interfering With Radioimmunoassay
A False-Positive Pregnancy Test
- Adrian O. Vladutiu, MD, PhD;
- Joan M. Sulewski, MD;
- Kathleen A. Pudlak;
- Carol G. Stull, N MS
- From the Departments of Pathology (Dr Vladutiu), Medicine (Dr Vladutiu), Microbiology (Dr Vladutiu), and Obstetrics and Gynecology (Dr Sulewski), State University of New York, Buffalo; and the Laboratory of Clinical Immunopathology, Buffalo (NY) General Hospital (Dr Vladutiu and Mss Pudlak and Stull).
Abstract
A young woman with amenorrhea had a consistently positive pregnancy test result (serum radioimmunoassay measurement of β-human chorionic gonadotropin hormone). No fetal or placental tissue was found after uterine curettage and exploratory laparotomy. The false-positive pregnancy test result was due to heterophilic antibovine and antigoat antibodies in the patient's serum. These antibodies interfered with radioimmunoassays using goat antibodies. This case shows that serum heterophilic antibodies can interfere with immunoassays and result in unnecessary diagnostic procedures and/or unnecessary treatment.
(JAMA 1982;248:2489-2490)
Footnotes
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Reprint requests to Department of Pathology, State University of New York, 100 High St, Buffalo, NY 14203 (Dr Vladutiu).
