Carrier Screening &
Premarital Genetic Testing
Most carriers are perfectly healthy and never know it — until two carriers of the same condition start a family. Carrier screening reads the genes behind conditions like beta-thalassemia, cystic fibrosis, and sickle cell disease, so a couple can understand their reproductive risk in advance and discuss it with a physician. It is educational information, not a diagnosis.
The Basics
What Carrier Status Means for a Couple
Being a carrier means you have one copy of a gene change for a recessive condition. One copy is almost never enough to make you unwell — carriers are typically healthy and have no symptoms, which is exactly why so many people never find out without a test.
It only becomes relevant when two people who carry a change in the same gene have a child together. With each pregnancy:
inherits both copies and is affected by the condition
is a healthy carrier, just like the parents
inherits neither copy of the change
Knowing this before a pregnancy is the whole point: it gives a couple time to talk through their options with a physician or genetic counselor, rather than learning after the fact.
What’s Screened
Conditions Carrier Screening Looks For
Which conditions matter most depends on ancestry. These are among the most commonly screened — several are especially prevalent across the Mediterranean and Middle East.
Beta-thalassemia
HBBA blood disorder that reduces healthy hemoglobin. Carrier rates are among the highest in the world across the Mediterranean and Middle East.
Sickle cell disease
HBBA change in the same hemoglobin gene that alters red blood cells. Common across parts of the Middle East, Africa, and the Mediterranean.
Cystic fibrosis
CFTRAffects the lungs and digestive system. The ΔF508 change is the most common cause worldwide.
Spinal muscular atrophy
SMN1A leading genetic cause of infant mortality when untreated; one of the most widely recommended carrier screens.
G6PD deficiency
G6PDCan trigger red-blood-cell breakdown after certain foods, infections, or medications. The Mediterranean variant is common in the region.
Familial Mediterranean fever
MEFVRecurrent fever and inflammation; one of the most common inherited conditions among Middle Eastern populations.
Tay-Sachs disease
HEXAA severe neurological condition of infancy. Screened widely, with elevated carrier rates in several ancestral groups.
Premarital Screening
Why It Matters Across the Region
Carrier screening is most valuable where two people are more likely to carry the same recessive change — and that is common across the Middle East. An estimated one in three marriages in Lebanon is between relatives (about 35.5%), which raises the odds that both partners carry the same condition.
It is also part of routine practice. Lebanon’s Law 334 requires a premarital medical exam, and awareness of premarital genetic screening is high. The gap today is interpretation: samples are collected, but a clear, couple-focused genetic report often isn’t part of the result. That is the gap Atlagene closes.
Read Together
A Report Built for Two People, Not One
A single carrier result in isolation is hard to act on. Atlagene reads a couple’s results together and puts the reproductive risk in plain language.
Carrier-compatibility
Both partners’ results read side by side, flagging any condition where both are carriers — the case that actually changes a plan.
Pedigree & family matching
Parent-child genetic matching and a pedigree view that show how a variant travels through a family.
Inherited-risk callouts
Clear, plain-language notes on what a couple may want to discuss with a physician before a pregnancy.
Physician review on serious findings
Findings that warrant a clinician are routed for review — the report never asks a couple to interpret a hard result alone.
Questions
Carrier Screening FAQ
What is carrier screening?
Carrier screening is a genetic test that tells you whether you carry a gene change for a recessive condition — such as beta-thalassemia, cystic fibrosis, or sickle cell disease. Carriers are almost always healthy themselves; the result matters mainly for family planning, because a child can be affected only if both parents carry a change in the same gene.
What is premarital genetic testing?
Premarital genetic testing is carrier screening done before marriage or before a pregnancy so a couple can learn, in advance, whether they both carry a change in the same recessive gene. In much of the Middle East — including Lebanon, where a premarital medical exam is required by law — it is a routine step, and it is most valuable where marriage between relatives is common.
What does it mean if both partners are carriers?
If both partners carry a change in the same recessive gene, then with each pregnancy there is a 1-in-4 (25%) chance the child inherits both copies and is affected, a 1-in-2 (50%) chance the child is a healthy carrier like the parents, and a 1-in-4 chance the child inherits neither copy. Knowing this in advance lets a couple discuss options with a physician or genetic counselor.
Which conditions does carrier screening cover?
Commonly screened recessive conditions include beta-thalassemia, sickle cell disease, cystic fibrosis, spinal muscular atrophy (SMA), G6PD deficiency, familial Mediterranean fever (FMF), and Tay-Sachs disease. Which conditions matter most depends on ancestry — beta-thalassemia and FMF, for example, are especially common across the Mediterranean and Middle East.
Is a carrier report a diagnosis?
No. A carrier report is informational and is not a diagnosis. It describes reproductive risk, not a current illness. Results should be reviewed with a physician or genetic counselor, who can arrange confirmatory testing and discuss options.
A note on scope
Carrier and premarital screening on Atlagene is informational, not a diagnosis. Coverage depends on the file you upload — consumer DNA arrays only test a subset of the variants a dedicated, lab-grade carrier panel would. For a complete premarital or carrier screen, work with a clinic or lab; results should always be reviewed with a physician or genetic counselor, who can arrange confirmatory testing.
See What’s in Your DNA File
Already have a 23andMe, Ancestry, or VCF file? Upload it to surface carrier-relevant variants. Running a lab or clinic? We can power a full branded carrier and premarital report for your patients.