Editing Lactose intolerance (section)

=== Genetic diagnostic ===
Genetic tests may be useful in assessing whether a person has primary lactose intolerance. Lactase activity persistence in adults is associated with two [[polymorphism (biology)|polymorphisms]]: C/T 13910 and G/A 22018 located in the ''MCM6'' gene.<ref name="variant"/> These polymorphisms may be detected by [[molecular biology]] techniques at the [[DNA]] extracted from blood or saliva samples; genetic kits specific for this diagnosis are available. The procedure consists of extracting and amplifying DNA from the sample, following with a hybridation protocol in a strip. Colored bands are obtained as result, and depending on the different combinations, it would be possible to determine whether the patient is lactose intolerant. This test allows a noninvasive definitive diagnostic.{{citation needed|date=May 2022}}