What does a CBC measure?

It measures red blood cells (hemoglobin, hematocrit, RBC count), white blood cells (total and five subtypes), and platelets from a single blood draw.

Do I need to fast for a CBC?

No. A CBC does not require fasting.

What conditions does a CBC help diagnose?

Anemia, infections, blood cancers, immune disorders, clotting problems, and nutritional deficiencies. It's also used to monitor chemotherapy effects.

How long does it take to get results?

CBC results are typically available within 1 business day.

What Does a CBC Test Measure?

The CBC with differential is one of the most commonly ordered blood tests. It measures your red blood cells (oxygen carriers), white blood cells (immune system), and platelets (clotting). The "differential" breaks down your white blood cells into five types (neutrophils, lymphocytes, monocytes, eosinophils, basophils), helping identify infections, allergies, and blood disorders.

How the Test Works

The CBC test is performed via a standard blood draw at any Quest Diagnostics location. Your sample is sent to a CLIA-certified lab for analysis. Results are typically available within 1-2 business days in your JustLabs account.

Conditions It Helps Diagnose

Anemia Iron Deficiency

Who Should Get Tested

Everyone — the CBC is a fundamental screening test. Especially important for anyone with fatigue, frequent infections, easy bruising, or unexplained symptoms.

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Frequently Asked Questions

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