CT Scans , Mri?

if i was to go to the hospital could i get these tests done right away ?

Most places have routine stuff scheduled 2-3 days in advance. If you are going in for something life threatening or atleast very serious then you may get head of the line privaledge. Unfortunately this is still an hour or so wait if your not on your death bed.

That depends. CT scans and MRI's are busy machines. Your hospital might have a day or two wait (or longer) on non-emergency MRI's, depending on how booked your schedule is and why you need to have it performed.

If you're in the ER and it's serious, you can probably get a rush, the same if you've got a physician (say, your GP) admitting you. They have priority over follow-up MRI's and CT's.

It would be entirely up to the doctor,and sometimes there is a long wait for using those type of things, if you had a serious injury you would be able to use them right away.

You will need a doctor to order these tests. Depending on where you live there will be a bit of a wait. A few weeks to a couple of months. Also depends on if it's considered urgent or not.
Private sector machines you can probably get same day or within a few days, but it will have a price.
Most will do one or the other but not both at the same time. MRI are more expensive than CAT

You can't just go to the hospital and say "I want an MRI" (or CT). A doctor has to order it and depending upon your health insurance plan and the reason for ordering the test, you may have to wait for authorization from your health insurance provider that they agree it's a necessary test and will cover the cost.

Obviously if it's an emergency, you'd probably get one sooner, but still - it has to be ordered by a doctor. You can't order one for yourself.

all depends on the problem. most times you need an aptment or a referal from youre Dr.