Hello and thank you for using HCM.I carefully read your question and I understand your concern. I will try to explain you something and give you my opinion. In our daily practice we meet every day whith patients with history of chest pain. Typical heart chest pain have some characteristics. They are retro-sternal pains like squizzing , tightness or heaviness. They may irradiate to both arms, jaw and last from 5-20 minutes. When we deal with a patient with chest pain,according to his symtoms we have to do some examination like an electrocardiogram, cardiac enzymes to exclude a heart attack and the most imortant one ernogometry. I think that your father has done this examination. It is an examination that tries to identify problems whith coronary heart disease. It doesn t make a dignosis of how many arteries are occluded, it only rises a doubt throught electrocardiogram changes. Than the diagnosis is made through coronary angiography. So, if your father has already done an ergometry that results whith problems than the next step is angiography to make the definite diagnosis. If we already have a ergomometey whith problemsit is contraindicated to repeat it.Becouse this means to expose the patient to a potential risc during extreme exertion. So, my opinion is that the ergonometry should not be repeated if it has problems the first time.The maximum you can do is to discuss its results with another cardiologyst for a second opinion if you are not shure. Hope I was helpful.Wish your father good health. Best regards.