How To Prepare continued...
Many medicines can
change the results of this test. Be sure to tell your doctor about all the
nonprescription and prescription medicines you take. If you take a medicine,
such as a
corticosteroid, that could change the test results,
you will need to stop taking it for up to 48 hours before the test. Your doctor
will tell you exactly how long depending on what medicine you take.
Do not exercise for 12 hours before this test.
Try to avoid
emotional stress for 12 hours before the test.
blood sample at the right time is often important. Your blood will be drawn in
the morning if your doctor wants a peak ACTH level. Your blood will be drawn in
the evening if your doctor wants a low (trough) ACTH level.
your doctor about any concerns you have about the need for the test, its
risks, how it will be done, or what the results will mean. To help you
learn about this test and how important it is, fill out the
medical test information form(What is a PDF document?).
How It Is Done
The health professional drawing blood
- Wrap an elastic band around your upper arm to
stop the flow of blood. This makes the veins below the band larger so it is
easier to put a needle into the vein.
- Clean the needle site with
- Put the needle into the vein. More than one needle stick
may be needed.
- Attach a tube to the needle to fill it with
- Remove the band from your arm when enough blood is
- Put a gauze pad or cotton ball over the needle site as
the needle is removed.
- Put pressure on the site and then put on a
How It Feels
The blood sample is taken from a vein in
your arm. An elastic band is wrapped around your upper arm. It may feel tight.
You may feel nothing at all from the needle, or you may feel a quick sting or