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?

Medium Chain Acyl-CoA Dehydrogenase Deficiency

What Your Test Results Mean:

Test results indicate that you are a carrier of medium chain acyl-CoA dehydrogenase deficiency (MCAD). Carriers are not expected to show symptoms. You and your partner or donor would both have to be carriers of MCAD 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.

Since this is an inherited gene change, this information may be helpful to share with family members as it may impact their family planning.

Disease Explained:

MCAD is an inherited metabolic disorder that prevents the body from converting certain types of fats (medium chain fatty acids) into energy. MCAD is usually diagnosed in infancy or early childhood, when the affected individual presents with symptoms such as vomiting, low blood sugar, lack of energy, and failure to thrive. Partially metabolized fatty acids can accumulate in body tissues and cause organ damage if the disease goes untreated. The symptoms are especially noticeable when the individual goes for a long time between meals or suffers from a viral infection. Thus, it is important to ensure that children with MCAD eat frequent meals, preferably high in carbohydrates and low in fats. When left untreated, individuals may be at risk for seizures, breathing difficulties, liver problems, brain damage, coma, and sudden death.

Fatty acid oxidation disorders, such as MCAD, have been reported to increase the risk for maternal complications in the third trimester of pregnancy when the baby is affected. Additional pregnancy monitoring may be recommended in these cases.


The prognosis of an affected individual depends on the severity of the symptoms but is usually good if the disease is diagnosed early and careful medical management is provided.


The primary focus of treatment is to avoid fasting. Infants will require frequent feedings, and toddlers will need a low-fat diet and could receive uncooked cornstarch at bedtime to sustain glucose levels overnight. Affected individuals should take simple carbohydrates by mouth (e.g., glucose tablets or sweetened, non-diet beverages) or IV if needed, to avoid fasting.

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