If someone in a family with known OPMD develops likely symptoms, then a diagnostic genetic test will often be advised.
Sometimes, people with a parent with OPMD wish to know whether they are likely to develop the condition. They may wish to consider a predictive test (i.e. prior to symptoms). After suitable discussion/counselling of the advantages and disadvantages of having this knowledge, a genetic test may be offered. In this situation, however, when a family member has inherited the mutated gene, it remains impossible to predict precisely when they will develop symptoms.