Spinal Muscular Atrophy (SMA) Carrier Test
Spinal Muscular Atrophy (SMA) Carrier Test is a laboratory test you can order directly. The SMA carrier test is a blood test that checks whether a person carries a gene change linked to spinal muscular atrophy (SMA), a rare inherited condition that affects nerve cells controlling muscle movement. It is usually ordered by people planning a pregnancy or already pregnant who want to learn their chance of having a child with SMA.
- Sample type
- blood
- Category
- General Wellness
- Turnaround
- 1-3 business days
- Price
- $1398
- Referral
- Not required
The SMA carrier test is a blood test that checks whether a person carries a gene change linked to spinal muscular atrophy (SMA), a rare inherited condition that affects nerve cells controlling muscle movement. It is usually ordered by people planning a pregnancy or already pregnant who want to learn their chance of having a child with SMA.
What it measures
- SMN1 gene copy number — Counts how many working copies of the SMN1 gene a person has; missing copies can mean a carrier.
- SMN1 sequence changes — Looks for small spelling changes in the SMN1 gene that can also cause SMA.
- SMN2 gene copies — Counts backup gene copies that can influence how severe SMA is, though this is not the main carrier result.
- Carrier status — A summary interpretation of whether the result suggests a carrier or not.
Who it is for
It is typically ordered by primary care clinicians, obstetricians, or genetic counselors for adults considering pregnancy or currently pregnant. Some people request it because of family history or ancestry-linked risk.
Preparation
No fasting or special timing is needed. A standard blood draw is all that is required, and you can eat and drink normally beforehand.
Results and what they mean
Results are usually reported as carrier, not a carrier, or a variant of uncertain significance, often within a few business days. A clinician or genetic counselor interprets the result in the context of your history and family plans. This is general information only and is not medical advice; discuss your results with a qualified professional.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the spinal muscular atrophy (sma) carrier test is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
Do I need this test if no one in my family has SMA?
Many carriers have no family history, so testing can still be useful. A clinician can help you decide based on your situation.
What does it mean if I am a carrier?
Being a carrier usually does not affect your own health. It means you could pass the gene change to a child, and your partner may also want testing.
Can the test miss some carriers?
Yes, some rare gene changes may not be detected, so a not-a-carrier result lowers but does not always eliminate the chance.
Is my result private?
Results are kept confidential as part of your medical record and shared only with those you authorize.