Hello. At the moment my diagnosis is dopa responsive dystonia (DRD) based on symptoms and age (started in 20s) as well as reaction to sinemet but I have seen a new neuro who wants me to have a DAT scan because my condition is progressing requiring increased dose which doesnt usually happen with DRD and I am collecting more parkinsonisms such as freezing and lack of facial expression. He wants to rule out PD. If you are taking sinemet do you have to come off meds for this test? One of the other tests he wants to prove DRD requires me to come off meds for 2 weeks which sounds horrendous to me.