Lab test
Complete Blood Count Test (CBC Test) with Differential
Complete Blood Count Test (CBC Test) with Differential can be ordered without a referral, and this guide covers what to expect. A Complete Blood Count (CBC) with differential is a common blood test that provides a broad overview of your general health and can help detect a wide range of conditions.
What this test is
This test measures and evaluates key components of your blood, including red blood cells, white blood cells, and platelets. The 'differential' part of the test breaks down the different types of white blood cells present.
What it measures
- Red Blood Cells (RBC) — oxygen-carrying capacity of the blood
- White Blood Cells (WBC) — body's response to infection and inflammation
- Hemoglobin — protein in red blood cells that carries oxygen
- Hematocrit — proportion of red blood cells in the blood
- Platelets — blood clotting ability
- WBC Differential — specific types of white blood cells
What the test involves
A healthcare professional will draw a small sample of your blood, typically from a vein in your arm. The blood is then sent to a laboratory for analysis.
Why it is often ordered
Clinicians often order a CBC with differential to screen for various health issues, monitor existing conditions, and assess your overall well-being. It can help identify signs of infection, anemia, or other blood-related disorders.
Preparation
No special preparation is usually needed for this test. It is recommended to follow any specific instructions provided by the laboratory where you will be having your blood drawn.
How results are reported
Your results will be reported by the laboratory, detailing the levels of various blood components. It is important to note that reference ranges can vary between different laboratories.
Before you go
- Fasting requirements
- Specimen collection hours
- How to receive your results
FAQ
Frequently asked questions
What is a differential count?
A differential count provides a breakdown of the different types of white blood cells (like neutrophils, lymphocytes, and monocytes) in your blood. This can offer more specific clues about the cause of an infection or inflammation.
Can a CBC detect cancer?
A CBC test can sometimes show abnormal white blood cell counts that may indicate certain types of cancer, such as leukemia. However, it is not a definitive diagnostic test for cancer and further investigations are usually required.
How long does it take to get CBC results?
Turnaround times for a CBC with differential can vary, but results are often available within one to three business days. Confirm the expected timeframe with your collection site.
Is a CBC test painful?
The blood draw for a CBC test involves a needle stick, which may cause brief discomfort or a pinching sensation. Most people find it to be a minor and temporary discomfort.
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