What you can expect

By Mayo Clinic Staff

For cytochrome P450 tests, a sample of your DNA is taken for lab testing. It can be retrieved in one of three ways:

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

After the procedure

Getting the DNA sample should take just a few minutes. Whichever type of test you have, your sample will be sent to a lab where your DNA is analyzed for specific genes.

Aug. 21, 2015