What it measures
Neutrophils are the most common type of white blood cell. They are the first to reach a site of infection, where they swallow and kill bacteria. 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.
- Often raised with bacterial infections, inflammation, steroid medicines and after hard exercise.
- Monitored on some medicines that can lower the count, such as clozapine and carbimazole.
- Checked when someone has frequent or unusual infections.
Typical range
Ranges vary by lab and method. Some healthy people, often of Black African, African Caribbean or Middle Eastern family origin, have naturally lower counts. 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.