What is Carrier Screening?
The Carrier Screening Test, also known as Carrier Genetic Test (CGT), is a vital genetic test for family planning. This test helps determine the risk of having a child with a genetic disease, and shows whether or not future parents are carriers of one or more recessive genetic mutations.
As a rule, carriers are healthy people. Yet, if both parents have a mutation in one and the same gene, their child may prove to be affected.
Anyone can be a carrier of one or more mutations unbeknownst to them, and the Carrier Screening Test is the best way to identify mutated genomes in a given person.
Why Should You Consider Carrier Genetic Testing (CGT)?
Many individuals discover they are carriers only after the birth of an affected child. While most genetic conditions identified by carrier screening are not curable, they are preventable — if detected early enough.
Carrier screening provides valuable information to guide decisions around fertility treatment, donor selection, and genetic counseling.
Anyone can be a carrier, regardless of family history or ethnicity.
Why is Carrier Screening Important?
The Carrier Screening Test enables us to identify whether or not a person is a carrier of one or moreof a long list of known mutations. The genetic disorders identified by the test are monogenic, meaning that this type of genetic disorders is a mutation of one gene. As a rule, these mutations are unknown to intended parents, because the intended parent has only one copy of a recessive genetic disorders.
If both intended parent carry a mutation of the same gene, it is possible that their child will inherit a mutated gene from each parent. In such cases, children may be affected by certain diseases, because the parents were not aware of being carriers of the genetic disorder.
The main goal behind conducting a Carrier Screening Test is to identify recessive mutations in a couple and to define ways of medical interference to prevent the transmission of the recessive condition to the child. Monogenic diseases are quite serious, posing a significant problem, in one form or another, for millions of people throughout the world.
According to the World Health Organization, the share of monogenic diseases in the world is about 1%, a high indicator. Certain data reveal that 18% of the cases of pediatric hospitalization are due to monogenic genetic disorders. In developed countries, 20% of the deaths are ascribed to this type of disorder. This is why preventing this disorder is so important.
Although, monogenic genetic disorders are not curable, such screening tests enable us to identify which partner(s) is a carrier of a disease, thereby preventing risks of transmitting this disorder to the child.
When is Carrier Genetic Testing (CGT) Recommended?
We are all carriers of genetic changes, yet it is the Carrier Screening Test that enables us to learn whether or not these changes may affect our children. The test is recommended in the following cases:
- Before natural conception — to assess potential reproductive risks.
- Before IVF or other fertility treatment — to guide medical decisions and testing plans.
- Before using donor eggs or sperm — to ensure the donor is not a carrier of the same mutation as the recipient.
What Happens if You’re a Carrier?
If only one partner is a carrier, there’s usually no significant risk. But if both partners carry mutations in the same gene — or if a woman is a carrier of an X-linked condition — there may be a risk of having an affected child.
In such cases, you’ll receive personalized genetic counseling and be presented with reproductive options such as:
- IVF with Preimplantation Genetic Testing for Monogenic Diseases (PGT-M)
- Using donor gametes
- Prenatal diagnostic testing
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Frequently Asked Questions (FAQs)
We know that fertility care often brings up many questions — and that every journey is different. Below you’ll find answers to some of the most common questions our patients ask.
Do I need carrier screening if I have no family history of genetic disease?
Yes. Most carriers of genetic mutations have no family history or symptoms. This test helps uncover hidden risks that standard health checks can’t detect.
What happens if both partners are carriers of the same condition?
You’ll be offered genetic counseling and presented with safe options such as IVF with PGT-M, using donor gametes, or prenatal testing during pregnancy.
Is carrier screening painful or invasive?
No. The test requires only a simple blood or saliva sample.
