@sandyjr I had DCIS. I went for a double mastectomy because of my high risk. They found DCIS in the other breast. I had the sentinal node removed. I was told when you only have a small number of nodes removed it's fine to use that arm for bloodwork and blood pressure. My mom had a much more aggressive and advanced inflammatory breast cancer and had many nodes removed. I forget how many but double digits. She has lymphedema. When she has gone for other surgeries her arm is marked. There is no bloodwork allowed of checking blood pressure. She woke up from a surgery and the blood pressure cuff was on her lympedema arm! Needless to say it's worse now.
I have had a ton of bloodwork done ,my veins are really un co operative. I have told them to take it from where ever they need to.