Home → Tests → WBC
WBC (White Blood Cell Count)
⚠️ Update approaching🔬 Evidence: LimitedInternal Medicine
Diğer adları: Leukocyte count, WBC, White blood cell count
⚠️
Discuss your test results with your doctor. This page is for informational purposes only and does not provide a diagnosis.
⚡ Key Facts
• Measures the total white blood cell count — a general indicator of the immune system
• Normal: 4,000–10,000/µL
• Elevated in infection, inflammation, and stress
• Low counts may increase infection risk
🧪 What Does This Test Measure?
The WBC (white blood cell) count measures the total number of leukocytes in the blood, providing a general overview of the immune system's activity.
📋 Why Is It Ordered?
Ordered for infection evaluation, inflammatory process monitoring, medication side effect assessment, and general health screening.
🔧 Preparation
No special preparation is generally required. Part of the CBC. Intense exercise and stress may transiently affect results.
📊 Reference Ranges
Normal: 4,000–10,000/µL (4–10 × 10⁹/L)
Low (leukopenia): <4,000/µL
High (leukocytosis): >10,000/µL
⚠️ Reference ranges vary by laboratory.
⬆️ High Values
Elevated WBC may be associated with infection, inflammation, physical or emotional stress, medications, and rarely leukemia.
⬇️ Low Values
Low WBC may be associated with bone marrow suppression, viral infections, autoimmune diseases, or certain medications.
⚙️ What Can Affect Results?
Infection, stress, medications (corticosteroids, chemotherapy), smoking, exercise, pregnancy, and daily variation may affect WBC results.
🔬 Evidence Summary
Limited evidence: 4 reviews.
📚 Most Important Studies on This Topic
1
Evaluation of Patients with Leukocytosis
Review· American Family Physician · 2015 · PMID: 26760415
2
Hematologic Conditions: Leukocytosis and Leukemia
Review· American Family Physician · 2019 · PMID: 31613564
3
Leukocytosis and Leukemia
Review· Hematology/Oncology Clinics of North America · 2016 · PMID: 27866578
✅ Key Takeaways
💡
What you learned: WBC provides a general overview of immune activity. Abnormal values require differential count and clinical correlation.
⛔
A WBC result alone cannot diagnose a specific condition. Differential count and clinical context are needed.
🔬 Sources Used on This Page
4 sources · Most recent publication: 2019📖
Review
Comprehensive topic evaluation
4
sources
Overall assessment: Evidence level for this topic is limited. This page is supported by 4 reviews.
📝 Questions to Ask Your Doctor
Be prepared for your appointment. Add questions to your list.
📋 References
[PMID: 31613564] Hematologic Conditions: Leukocytosis and Leukemia. American Family Physician, 2019.
[PMID: 27866578] Leukocytosis and Leukemia. Hematology/Oncology Clinics of North America, 2016.
[PMID: 26760415] Evaluation of Patients with Leukocytosis. American Family Physician, 2015.
[PMID: 9971870] Acute-phase proteins and other systemic responses to inflammation. New England Journal of Medicine, 1999.
Last reviewed: 4/2/2026
Next review: 4/2/2027
🔗 Related Topics
⚖️ This page does not replace medical advice. Make treatment decisions with your doctor.
Content is based on scientific studies indexed in PubMed and current clinical guidelines.
Content is based on scientific studies indexed in PubMed and current clinical guidelines.