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?

Methylmalonic Acidemia, MMAB-Related

What Your Test Results Mean:

Test results indicate that you are a carrier of methylmalonic acidemia, MMAB-related. Carriers are not expected to show symptoms. You and your partner or donor would both have to be carriers of methylmalonic acidemia, MMAB-related 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:

Methylmalonic acidemia is an inherited disorder in which the body is unable to process certain proteins and fats properly. Symptoms typically present in infancy and vary from mild to life-threatening. Affected infants can experience vomiting, dehydration, weak muscle tone (hypotonia), developmental delay, excessive tiredness (lethargy), an enlarged liver (hepatomegaly), and failure to gain weight and grow at the expected rate. Long-term complications can include feeding problems, intellectual disability, chronic kidney disease, and inflammation of the pancreas. Without treatment, this disorder can lead to coma and death in some cases.


Prognosis varies and is often dependent on the age of onset of symptoms, the severity of symptoms, and the responsiveness to treatment. In general, early diagnosis and treatment is associated with a better outcome. Some affected individuals have lifelong learning problems, intellectual disability, seizures, or growth delay, even with treatment.


Treatment for methylmalonic acidemia involves vitamin B12 supplementation for the vitamin B12 responsive subtypes, L-carnitine supplements, a special protein managed diet, avoidance of fasting, and management of symptoms as they appear. Methylmalonic acidemia, MMAB-related is typically non-vitamin B12 responsive.

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.

Planning to Have a Baby Already Expecting
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