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Autosomal recessive inheritance
SMA develops when two altered copies inherited from the parents come together.
Omega Genetics specialist guide
Essential information about Spinal Muscular Atrophy (SMA) and the clinical meaning of testing
SMA is not only a disease topic; it is also part of genetic risk management in pregnancy planning.
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Carrier status usually causes no symptoms
A person may be healthy while carrying the genetic change. Risk becomes visible through testing.
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Couple assessment is important
When one partner is a carrier, testing the other is critical to understand pregnancy risk.
1
What exactly is SMA?
Spinal Muscular Atrophy is an inherited condition affecting motor neurons in the spinal cord and may cause muscle weakness and progressive neuromuscular symptoms. Clinical severity varies, which makes early carrier awareness valuable for planning.
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Why does carrier status matter?
SMA carriers are generally healthy. When both partners are carriers, each pregnancy carries a risk of an affected child. Preconception screening supports family planning.
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What is its role in pregnancy planning?
Knowing carrier status before conception allows assessment and counselling without the time pressure of an ongoing pregnancy.
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When is prenatal diagnosis considered?
If both partners are carriers, options such as chorionic villus sampling and amniocentesis are assessed by a physician according to gestational age and clinical circumstances.
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How should results be interpreted?
Results should be interpreted together with the method’s scope, family history and clinical circumstances. A result alone is not a diagnosis or treatment decision.