Does a stent with 75% stenosis generally need intervention?

Generally stenosis of a coronary artery that is over 70 % blocked is standard. As far as going in to restent a stent that is 75% blocked, I would like to know if it's a critical artery that is involved and/or if it's causing symptoms. If you're referring to yourself,your cardiologist who knows all this information is best to answer your question.