What it measures
Basophils are the least common type of white blood cell. They release histamine and other chemicals during allergic reactions and inflammation. The count is part of the white cell breakdown (the differential) in a full blood count.
Why people test it
- Reported with a full blood count that includes the white cell breakdown.
- Looked at alongside the other white cells when a blood count is unusual.
- A raised count that stays raised is looked into with a blood film and repeat tests.
Typical range
Basophil counts are very small, and many reports show a count at or near zero. Ranges vary by lab, method and analyser, and your report shows the lab's own range.
Finger-prick or vein?
A vein sample is usually advised. Blood from a finger prick can clot or break up (haemolyse) in the tube, which upsets blood-count results.