What you can expect

For cytochrome P450 tests, a sample of your DNA is taken, using one of these methods:

• Cheek swab. A cotton swab is rubbed inside your cheek to get a cell sample.
• Saliva collection. You spit saliva into a collection tube.
• Blood test. Blood is drawn from a vein in your arm.

After the procedure

Getting the DNA sample should take just a few minutes. Then your sample is sent to a lab where your DNA is analyzed for specific genes.