Have you asked your doctor? For whatever reasons, some doctors are remiss in volunteering information, but will explain things if asked. Those are perfectly reasonable questions, and I don't know of any reason why your doctor wouldn't give you a candid answer.

In this group, we're somewhat familiar with that test & why it's done, and it does have to do with honing in on diagnosis. Unfortunately, that doesn't always result in better/different treatment options.

Doc