Dear Qamar, thank you for your question. A radioisotope is injected during a thallium scan to evaluate blood flow to the heart muscle. Thus, there is little risk to the patient who undergoes a thallium test and little risk to anyone who comes into contact with that patient. We do not recommend restricting contact with children after a thallium scan, but certainly 4 days would be long enough. I hope you find this information useful.
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