<s>[INST] I am 54 years old, 6 -1 tall and 270 lbs... I recently had a bone scan contrast and was curious about the effects on sperm. Is it safe for sperm to be ingested 5 days after the procedure and if not, how long is it necessary to wait for it to be non-toxic? [/INST] Hi, Yes, it will be completely safe. There is no effects on sperm by the contrast, you can go ahead without any fear. Thank you. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Jaideep Gaver, Orthopedic Surgeon </s>