Complete Blood Count with Differential and Platelet Count (CBC with Differential)

What Does a CBC with Differential Measure?

A CBC with differential includes several key components: - **Red Blood Cells (RBCs):** Count, size (MCV), and shape (e.g., anisocytosis). - **White Blood Cells (WBCs):** Total count and subtypes (neutrophils, lymphocytes, monocytes, eosinophils, basophils), which help identify infections or inflammatory conditions. - **Platelets:** Count and size, important for blood clotting. - **Hemoglobin and Hematocrit:** Measures oxygen-carrying capacity of blood. - **Mean Corpuscular Volume (MCV):** Average size of RBCs, which can indicate types of anemia.

Why Might You Need This Test?

This test is commonly ordered for routine health checks, diagnosing symptoms like fatigue, frequent infections, easy bruising, or unexplained bleeding. It may also be used before surgeries, during pregnancy, or if you have symptoms such as pale skin, rapid heartbeat, or unexplained weight loss.

How Is the Test Performed?

A small sample of your blood is drawn from a vein, usually in your arm. The sample is then analyzed in a lab to measure the components listed above. The results are typically available within 24 to 48 hours, depending on the lab.

What Are Common Findings and Their Implications?

Abnormal results can signal various conditions: - **Low RBC count (anemia):** May indicate iron deficiency, vitamin deficiencies, or chronic diseases. - **High or low WBC count:** Can signal infections, autoimmune disorders, or other systemic issues. - **Abnormal platelet count:** May suggest bleeding disorders or clotting problems. - **Shift in differential:** For example, an elevated neutrophil count might indicate infection, while a high lymphocyte count could suggest chronic infection or lymphoma.