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Journal of Nuclear Medicine Technology Volume 31, Number 1, 2003 21-24
© 2003 by Society of Nuclear Medicine

IMAGING

The Day of Contamination

Darcy L. Kasner and Michael E. Spieth, MD

Marshfield Medical Research and Education Foundation and the Department of Radiology, Nuclear Medicine Section, Marshfield Clinic, Marshfield, Wisconsin

Objective:We present 3 cases of suspected radioisotope urinary contamination that occurred on a single day. Because net clearance is via the kidneys, the injected dose is excreted in patients’ urine. It is important to recognize the patterns of urinary contamination to avoid reporting false-positive abnormalities.

Materials and Methods:99mTc-Medronate was administered intravenously and whole-body bone scans and spot views were obtained 2–3 h later.

Results:Two cases of urinary contamination were confirmed, and the third case was false-positive with a urinary collection leg bag seen in an orthogonal view.

Conclusion:We believe that urinary contamination is probably the most common type of contamination. There are distinct urinary contamination patterns among male and female patients. It is unusual to find so many cases of contamination on a single day in our institution. Few statistics are widely available on the number or percentages of contamination for specific radiopharmaceuticals.

Key Words: contamination; urine; 99mTc-medronate




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