How to order and submit your MDR1 test for dogs and cats

Ordering an MDR1 genetic test is a simple way to learn whether your dog or cat has a genetic mutation that affects how certain medications are processed. Results help you and your veterinarian choose safer treatment options and avoid drugs that could cause harmful reactions in your pet.

The steps below walk you through how to order the test, collect a sample, and submit it for analysis.

How to order an MDR1 test

1. Create or log in to your WSU testing account
   Go to the MDR1 testing webpage on the Washington Animal Disease Diagnostic Laboratory website and click on the “Order Now” button. You will be prompted to create a new account or login in to your existing account.
2. Order the MDR1 genetic test
   Click the “Order an MDR1 Test” button and complete your order online.
3. Collect your pet’s sample
   Our test can be run using either a cheek swab sample, which you can collect at home, or a blood sample, which should be collected by your veterinarian.
   • Cheek swab: DNA collection brushes will be mailed to you with instructions.
   • Blood sample: Your veterinarian can submit a blood sample directly (EDTA/purple-top tube).
4. Submit the sample
   Include the completed submission form and send the sample to WSU following the provided shipping instructions.
5. Receive results
   Test results are typically available within 2–7 business days after the sample is received.