Health LibraryTests & ProceduresComplete Blood Count (CBC): What It Tells You
Tests & Procedures

Complete Blood Count (CBC): What It Tells You

The most commonly ordered blood test — and what its numbers mean.

Medically reviewed
Updated 2026

What it measures

Red blood cells, white blood cells and platelets — plus subtypes and indices that hint at deficiencies, infections, or bleeding disorders.

Preparation

No fasting needed. Results usually available same-day.

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