A white blood cell (WBC) count is considered abnormal when it falls outside the normal range. Generally, the normal WBC range is between 4,500 and 11,000 cells per microliter. According to Medicinenet, a WBC count greater than 11,000 cells per microliter is considered high, indicating an abnormality.
Understanding Abnormal WBC Levels
What is a WBC Count?
A white blood cell count measures the number of white blood cells in a sample of your blood. White blood cells are part of your immune system, fighting off infections and diseases.
High WBC Count (Leukocytosis)
- A WBC count greater than 11,000 cells per microliter is considered high. This condition is called leukocytosis.
- Causes of high WBC counts can include infections, inflammation, stress, certain medications, and blood cancers.
Low WBC Count (Leukopenia)
While the provided reference focuses on high WBC counts, it's also important to know about low counts:
- A WBC count below 4,500 cells per microliter is considered low. This condition is called leukopenia.
- Causes of low WBC counts can include autoimmune disorders, bone marrow problems, severe infections, and certain medications.
Summary Table: WBC Levels
| Condition | WBC Count (cells/microliter) |
|---|---|
| Normal | 4,500 - 11,000 |
| High (Leukocytosis) | > 11,000 |
| Low (Leukopenia) | < 4,500 |
When to Seek Medical Attention
It is important to consult a doctor if you have an abnormal WBC count because it may indicate an underlying health issue.
