Haematologists are specialists who detect, diagnose and treat blood-related disorders. They are concerned with the cross-matching of blood to ensure compatibility in blood transfusions, the biochemistry of blood clotting and the investigation of a variety of defects in blood metabolism.

If a patient has been to their general practitioner complaining of symptoms such as unexplained bruising, glandular fever related symptoms or unusual frequent bleeding the patient may be referred to a haematologist.