Sometimes a wise physician's clinical acumen tells him to sit on an issue rather that put it through the wringer.
The testing can be expensive and time consuming for everyone involved.
Often, if a competent, experienced physician says let's sit on this thru the weekend, then it's for good reason.
On the other hand, if he said "take these for pain, but call me on Tuesday if you are still in pain." and you are still in pain on Tuesday then call him.
Look folks, there is ALWAYS a test that can be ordered.... but that doesn't mean that it needs to be ordered.
Trust your Doc, or get a new Doc.