How It Is Done
The health professional taking a sample of your blood will:
- 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 alcohol.
- Put the needle into the vein. More than one needle stick may be needed.
- Attach a tube to the needle to fill it with blood.
- Remove the band from your arm when enough blood is collected.
- 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 bandage.
For a secretin test, a blood sample is drawn and then the digestive hormone secretin is injected into a vein in your arm. Additional blood samples are drawn at the time of the injection, then every 5 minutes until 15 minutes have passed, and then again at 30 minutes after the secretin injection.
|By:||Reference Healthwise Staff||Last Revised: Reference March 7, 2012|
|Medical Review:||Reference Adam Husney, MD - Family Medicine
Reference Jerome B. Simon, MD, FRCPC, FACP - Gastroenterology