At the first school physical at age 7 my mother followed me, so she must obviously have got a letter, but I do not see it. At that physical the doctor checked if my testicles were at right place. At all physicals I was totally nude. At the rest of the physicals we were just called down.
But we had to bring home a glass for urine specimens with a letter the day before the physical so my parents obviously new.
At 14 we had a hernia check.
But at 7 my mother folowed me downtown for a hearing test and a thorrough examination of my ears, so she obviously got a letter.
At 8 she followed me to a hearing test in a room at school apart from the school medical room.
At 12 she followed me up to a section in the school where they performed a thorough pelvic exam on me, including examination inside my urethra, bladder and rectum with instruments. I got some strong relaxing stuff so that I slept during most of the procedure that took 5 hours according to my memory. I remember that when we got out of the building, I saw that the schoolyard was totally empty, which meant that it was way past schooltime, and I got astounish about how long time this ordeal took.
At 14 my father followed me downtown to a clinic for an exam that also took a long time. But I do not explicitly remember what was done to me. I must have got some anesthesia that made me unconscious most of the time. What I remember however, is that when going home, I had feelings in my anus and urethra telling me that something had been done there.
I do not know how many of the kids had these special exams, but certain circumstantial observations told me that I was not the only one.
At 7 my parents got a big formula to fill out about my health, body functions and habits. Possibly what they filled out decided what special exams we had to go through. I had some problems with urination as a kid, and I was prone to infections, so these exams were quite logical.