What is carrier screening?

Carrier screening is a blood or saliva test that checks whether you carry a gene change for certain inherited conditions. Being a carrier almost always means you are perfectly healthy. For recessive conditions you need two altered copies to be affected — carriers have one. The relevance is for your children: if both partners carry a change in the same gene, each pregnancy has a one in four chance of being affected. ACOG recommends that all patients considering pregnancy or already pregnant — regardless of ethnicity or which screening approach is used — should be offered: Cystic fibrosis screening Spinal muscular atrophy screening A complete blood count, and screening for thalassaemias and haemoglobinopathies That last point matters particularly in India, where thalassaemia and other haemoglobin disorders are relatively common. It is recommended for everyone, not only for those with a family history. Fragile X premutation screening is recommended more selectively — for women with a family history of fragile X-related disorders or intellectual disability suggestive of fragile X, or a personal history of ovarian insufficiency. Timing: before pregnancy is ideal, because it gives you the fullest range of options. Screening during pregnancy is still useful but narrows the choices available. One practical point ACOG makes: carrier screening for a specific condition generally needs doing only once in your lifetime. Keep your results — repeating them later is usually unnecessary cost.