What to expect from pre-marital screening for thalassaemia carrier status

Thalassaemia carriers have a gene change affecting haemoglobin production. Many carriers feel well, although their red blood cells may be smaller or their haemoglobin may be mildly low. This pattern can resemble iron deficiency, so iron treatment should not be started solely from a small red-cell measurement.

The laboratory may combine a full blood count with haemoglobin analysis and, when needed, genetic testing. One partner carrying a thalassaemia-related change does not establish thalassaemia disease in a future child. If both partners carry relevant changes, a genetics professional can explain inheritance, possible testing during pregnancy, and available reproductive choices.

Bring previous blood results, details of any anaemia diagnosis, and information about relatives who have needed regular transfusions or treatment for a blood disorder. Ask whether iron studies are needed before interpreting a low haemoglobin or small red blood cells.

Both partners should provide results to the same clinician where possible. If a result is borderline, unusual, or difficult to interpret, confirmation may be offered. Do not stop prescribed treatment without advice, but tell the clinician about iron, folate, and other supplements so the result is considered in context.

Arrange genetics or haematology advice before conception if both partners are carriers, either result is uncertain, or a family member has thalassaemia disease. During pregnancy, seek urgent maternity assessment for severe breathlessness, fainting, chest pain, heavy bleeding, or severe weakness rather than waiting for screening follow-up.

Which type of thalassaemia-related change was found? Could iron deficiency be affecting the result? Should my partner have testing or confirmation? If we both carry a change, what pregnancy testing and counselling options are available?