Carrier and carrier couple

A carrier has one copy of a gene variant associated with a recessive genetic condition, alongside one usual copy, and is typically healthy themselves because the usual copy compensates. A carrier couple is a couple where both partners are carriers for the same recessive condition — for example both carrying a beta-thalassaemia trait — which raises the chance, though does not guarantee, that a child could inherit both altered copies and be affected by the condition. Being identified as a carrier is common and is not a reflection of anyone's health or worth; many people carry at least one recessive gene variant without knowing it, often discovered only through carrier screening or after an affected child. Carrier couples can be offered genetic counselling to discuss options, which may include prenatal testing in a pregnancy or, in some situations, PGT-M during IVF.

Also known as: genetic carrier, carrier couple, thalassaemia trait, carrier status

Last reviewed: 9 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.