Why Do Some Saliva Samples Fail Analysis


There are several reasons why analysis of a sample may not be successful, and it is not always known why it is more difficult to analyze some samples over others. If necessary, the lab will make multiple attempts at all stages of the process in order to provide results; however, due to biological variability some people simply don't have a high enough concentration of DNA in their saliva for our technology to process.

If your sample has to repeat one of the analysis steps, your sample status will update; both DNA isolation (Step 3) and DNA analysis (Step 4) may be repeated.

In the event of an analysis failure that requires a second sample be provided, Advanx Health team will be in contact with you for a replacement saliva sample.

Replacement Sample

You will also receive an email in the event a replacement needs to be requested. When submitting a replacement sample, we recommend reviewing the tips on providing a good sample, including:

  1. Do not eat, drink, smoke, chew gum, brush your teeth, or use mouthwash for at least 30 minutes prior to providing your sample.

  2. Collect the recommended volume of saliva. The recommended volume of saliva to provide is 2 mL. The collection tube comes with 2mL of buffer solution (to stabilise your DNA), so your saliva sample should be just above the 4mL line. Make sure that any bubbles are above the 4mL line.

  3. Cap securely before shipping. Remember to remove and discard the funnel and place the tube cap on securely before mailing your sample to our laboratory.

Receiving a Refund

In the event of a second sample failure, you will be able to request a refund for the purchase price of your kit after subtracting shipping and handling charges. Review our full refund policy.


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