At a Glance
Why Get Tested?
If you have anaemia (too few red blood cells) or polycythaemia (too many red blood cells), to assess its severity, and to monitor response to treatment
When to Get Tested?
As part of a full blood count (FBC), which may be requested for a variety of reasons
A blood sample collected from a vein in your arm or by a finger-prick (children and adults) or heel-prick (newborns)
Test Preparation Needed?
Ideally you should be reasonably hydrated when having a haemoglobin test or the result may be inaccurately high.