CBC with Differential
A comprehensive blood test that evaluates red blood cells, white blood cells, and platelets to detect disorders such as anemia, infection, and leukemia.
{"Measures red blood cells, white blood cells, and platelets","Differential counts the five types of white blood cells","Used for diagnosis, monitoring, and routine health screening","No special preparation typically required","Results help identify infections, anemia, and blood cancers"}
Key facts at a glance
- Category
- hematology
- Sample
- whole-blood
- Container
- lavender-top (EDTA)
- Fasting
- false
What is a CBC with Differential?
A Complete Blood Count (CBC) with Differential is a comprehensive blood test that measures various components of your blood. The "differential" part specifically identifies and counts the five types of white blood cells: neutrophils, lymphocytes, monocytes, eosinophils, and basophils. This test provides detailed information about your blood health and helps doctors diagnose a wide range of conditions.
What Does It Measure?
The CBC with Differential measures: **Red Blood Cells (RBCs):** - RBC count - Hemoglobin (oxygen-carrying protein) - Hematocrit (percentage of blood that is RBCs) - RBC indices (MCV, MCH, MCHC, RDW) **White Blood Cells (WBCs):** - Total WBC count - Neutrophils (fight bacterial infections) - Lymphocytes (fight viral infections) - Monocytes (fight chronic infections) - Eosinophils (respond to allergies and parasites) - Basophils (involved in allergic reactions) **Platelets:** - Platelet count - Mean Platelet Volume (MPV)
Why Is This Test Performed?
Doctors order a CBC with Differential for various reasons: 1. **Routine Health Checkup:** To assess overall health and detect hidden conditions 2. **Diagnosing Conditions:** Identify anemia, infections, inflammation, leukemia, or other blood disorders 3. **Monitoring Treatment:** Track progress during treatment for blood-related conditions 4. **Pre-Surgical Evaluation:** Ensure patient is fit for surgery 5. **Symptom Investigation:** Evaluate symptoms like fatigue, weakness, fever, bruising, or bleeding
How Is the Test Performed?
A healthcare professional will draw a small blood sample from a vein in your arm. The procedure takes only a few minutes. The blood sample is then sent to a laboratory for analysis. Most patients can return to their normal activities immediately after the test.
Understanding Your Results
Results are compared to reference ranges that consider age, sex, and other factors. Abnormal results don't always indicate a problem—your doctor will interpret the findings based on your overall health and other test results. Follow-up testing may be needed to confirm a diagnosis.
Frequently asked questions
Do I need to fast before a CBC with Differential?
What do high white blood cell counts mean?
What do low red blood cell counts indicate?
How long does it take to get results?
What's the difference between CBC and CBC with Differential?
Sources
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 1, 2026. · Read our editorial policy