Genetic risk in related couples when planning pregnancy

When partners share a biological ancestor, they may carry the same recessive gene change without knowing it. A child is affected by a recessive condition only when relevant altered copies are inherited from both parents. Relatedness does not mean a child will have a genetic condition, and family history can change the assessment.

A genetic counsellor reviews ancestry, known diagnoses, previous pregnancies and the health of relatives. The discussion is confidential and can explain what a screening result can and cannot show. It may also identify conditions that are passed through other inheritance patterns.

Arrange preconception genetic counselling early, ideally before trying to conceive. Bring medical reports and details of relatives with childhood illness, developmental differences, repeated pregnancy loss or a known inherited diagnosis. Carrier screening may be offered, with testing of one or both partners depending on the situation.

If a shared risk is identified, the counsellor can discuss options such as natural conception with prenatal testing, assisted reproductive approaches, donor conception or adoption. These are personal choices; counselling should support informed decisions without directing you toward one path.

Seek a genetics appointment before pregnancy if either partner has a known inherited condition, a concerning family history, or a previous child with an unexplained genetic diagnosis. If you are already pregnant, contact your obstetric team promptly because some testing and ultrasound decisions depend on pregnancy timing.

Ask which family details matter, whether carrier screening is appropriate, what a positive or negative result would mean, and whether relatives should be tested first. Ask about available prenatal tests, their timing and their limits before making decisions.