My dad just got a health check-up, and his TMT test came out positive. The doctor suggested we go for an angiogram, and I'm curious if we're on the right path here. Is there a possibility that the angiogram might show no blockages at all? Also, are there any risks we should be aware of when getting an angiogram?

Yes, you're on the right track. A positive TMT (Treadmill Test) suggests that there may be reduced blood flow to the heart, and an angiogram is a standard follow-up to check for any blockages. It is possible that an angiogram might show no significant blockages; sometimes TMT results are positive due to other factors. Angiograms are generally safe, but they do carry minimal risks, such as bleeding, infection, or, rarely, an allergic reaction to the dye used.