In short they can go to a doctor, get an abortion, get a morning after pill, be treated for STD's and get birth control, all without the parent being alerted, asked for permission, or for that matter even allowed to access their minor kids medical records.
Unless the doctor or a nurse takes a personal legal/civil liability in telling you then you'll never know unless the kid tells you.
Please people don't flame me I'm only explaining this due to some unpleasant experiences I had with a minor who was in my custody. I don't think it is right, I certainly do not agree with it. But that is why they passed the law. The village Idiots have taken the place of parent and that is not aimed at the doctors or nurses. They can have their butts sued off and in these times face possible criminal charges as well.
I take it because the states have wrested the care of the child from the parents with respect to the child's right privately to seek and obtain reproductive medical treatment, that now has somehow morphed into a mandatory session with a child while excluding the parent.
I do not concede that the constitutional justification for the first somehow enables the second. In fact, I object to the constitutional justification for the idea that a child can be treated quite apart from the supervision of the parent.
We see this in that dreadful case arising out of Massachusetts General Hospital.