Answer to Question #8644 Submitted to "Ask the Experts"
The following question was answered by an expert in the appropriate field:
My husband had a technetium-99m heart scintiscan today. We are trying to have children, so I would like to know when it will be okay to keep on trying and whether some of the administered technetium-99m has been stored in his sperm. If so, what should we do about it?
First, see a posting on our Ask the Experts website.
Even though the question above refers to x-ray exams, it would also apply to nuclear medicine exams. The radiation doses from the exams are similar.
Technetium-99m has a half-life of six hours. That means after three days it is essentially all gone. It is not stored anywhere in the body; it just decays to a nonradioactive material and is eliminated from the body in the urine.The only time a patient is given instructions to postpone conception is after a therapy treatment. So there is no need for concern after a diagnostic study.
Marcia Hartman, MS