It's a phrase which meant, for example, follow what is on a medication label. Chatting with someone last night who is now in his early 40's (?), who expressed resistance when I said that a certain doctor in the 1990's required- ordered- every patient to use two Fleet enemas an hour before his physical exam because he used a rigid sigmoidoscope during it, if you post the time period, your age, were there doctor's orders that you resisted, questioned?
I have written about trying to do jumping jacks with briefs at my knees, age 14, 1960's. Doctors in the period having gone through WWII (the pics of naked draftees), expected compliant patients, and I hadn't been told that I could pull my briefs back up.
I was in my 30's in the 90's when I used the enemas before my physical. But I didn't take everything off, same age, period, when told 'so I can see your skin' by a different doctor. And I did do so with doctors who didn't specify exactly how much I should take off.
How old were you and/or what year did you hear a doctor's order which you obeyed at the time, questioned later, or resisted, and why?