A dangerously low White Blood Cell (WBC) count, also known as leukopenia or neutropenia, is generally considered to be less than 4,000 per microliter (μL) of blood, although some labs may use a threshold of less than 4,500/μL. This low count can impair the body's ability to fight off infections effectively.
(Reference: A blood test that shows a WBC count of less than 4,000 per microliter (some labs say less than 4,500) could mean your body may not be able to fight infection the way it should. A low number is called leukopenia or neutropenia. Leukopenia can either be acute or chronic.18-Nov-2023)
Here's a breakdown:
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Normal WBC Range: While this can vary slightly between labs, generally, a normal WBC count falls between 4,500 and 11,000 WBCs per microliter of blood.
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Leukopenia/Neutropenia: This condition signifies a lower-than-normal number of WBCs. It can be either acute (short-term) or chronic (long-term).
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Why is it dangerous? WBCs are crucial for fighting infections. A low count means the body's defense system is weakened, making individuals more susceptible to illnesses.
| Term | WBC Count (per microliter) | Significance |
|---|---|---|
| Normal Range | 4,500 - 11,000 | Healthy immune function |
| Leukopenia | Less than 4,000 (or 4,500) | Increased risk of infection |
