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 two 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 skin cell sample.

After the procedure

Getting a cheek swab or having a blood sample drawn 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.

April 16, 2015