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Complete Blood Count, CBC

Synonyms

Full Hemogram, FHG, full blood count, FBC, CBC

Purpose

The CBC test analyzes red and white blood cells and platelets to detect infections, anemia, inflammation, and blood disorders. Doctors perform the test when symptoms like fatigue, fever, weakness, or unexplained bleeding occur to identify underlying causes.

They may pair it with ESR, CRP, iron studies, vitamin B12, or folate tests for a more complete and accurate health evaluation. Doctors may also order it during routine checkups or monitor ongoing medical conditions, or assess the effectiveness of treatment.

Complete Blood Count Patient Preparation

No special preparation is required for this test.

Sample Type

Whole blood

Sample Volume

4 mL

Sample Collection Container

EDTA tube (purple top)

Sample Collection Instructions

Mix the sample gently by inverting it eight times immediately after collection to ensure proper mixing of blood with the EDTA

Sample Storage

Refrigerate the samples if sampling is not done within 24 hours.

Reference Range

Reference ranges vary for each cell.

Results Turnaround for Complete Blood Count

Within a day of sample collection.

Diseases / Diagnostic Indicators

The Complete Blood Count (CBC) provides important indicators such as low or high red blood cell count (anemia or dehydration), elevated white blood cells (infection or inflammation), abnormal platelet levels (bleeding or clotting disorders), and hematocrit levels, which can point to various blood-related conditions and health issues. For further study, visit this study.