What Does NxGen MDx Screen For?

We screen for up to 120 genetic disorders that can affect your pregnancy, the health of your baby, and your family's future. You can learn more about our various screens — and which sets of screens (or "panels") align with where you are in your reproductive journey.

What Does NxGen MDx Screen For?

Dihydropyrimidine Dehydrogenase Deficiency

What Your Test Results Mean:

Test results indicate that you are a carrier of dihydropyrimidine dehydrogenase deficiency. Carriers are not expected to show symptoms of dihydropyrimidine dehydrogenase deficiency. However some carriers, such as yourself, may experience toxic reactions to fluoropyrimidine drugs, which are used to treat cancer. You and your partner or donor would both have to be carriers of dihydropyrimidine dehydrogenase deficiency for there to be an increased chance to have a child with symptoms. This is known as autosomal recessive inheritance. Carrier testing of your partner or donor is recommended in addition to consultation with a genetic counselor for a more detailed risk assessment.

We recommend that you share and discuss this information with all of your health care providers. Since this is an inherited gene change, this information may be helpful to share with family members as it may impact their family planning and their own personal clinical management.

Disease Explained:

Dihydropyrimidine dehydrogenase deficiency is an inherited condition that prevents the body from breaking down the nucleotides thymine and uracil. The presentation of this condition can vary greatly in severity. Most affected individuals have no symptoms, but some can have mild-to-severe neurological problems that may include seizures, intellectual disability, delayed motor skills, and/or autism. Affected individuals must avoid the chemotherapy drug 5-fluorouracil and other fluoropyrimidines. Because the body cannot break down these drugs, the fluoropyrimidines are toxic and life-threatening to people with dihydropyrimidine dehydrogenase deficiency.


Prognosis is not well-defined as the severity of the condition is highly variable.


There is no cure or specific treatment for dihydropyrimidine dehydrogenase deficiency, but symptoms such as seizures can be addressed if they arise.

Which Screens Are Right for You?

Determining which screens or set of screens are right for you will depend on where you are in your reproductive journey. Tell us where you are today so you can learn more about how to move forward tomorrow.

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Which Screens Are Right for You?

Talk to a Genetic Counselor

As a NxGen client, you'll have access to personal genetic counselors who can help explain the results of your screens and provide insight on how to move forward. To schedule a personal conference to discuss your screen results, call (855) 776-9436. or click the link below.

Discuss Your Screening Results