Leukocytes (white blood cells) are essential components of the immune system.

The TLC test provides the total count of all types of leukocytes (neutrophils, lymphocytes, monocytes, eosinophils, basophils).

Clinical uses include:

Detecting infections (bacterial, viral, parasitic).

Identifying inflammatory conditions.

Monitoring bone marrow function.

Supporting diagnosis of hematological disorders such as leukemia.

The test is performed using a blood sample, typically via automated hematology analyzers.

Analyte: Total number of leukocytes in blood.

Normal Range: ~4,000 – 11,000 cells/µL (varies by lab).

Abnormal Findings:

Leukocytosis (↑ TLC): Suggests infection, inflammation, stress, or leukemia.

Leukopenia (↓ TLC): Suggests bone marrow suppression, viral infections, autoimmune disease, or drug effects.

Clinical Use:

Provides a general measure of immune system activity.

Helps guide further differential leukocyte count (DLC) testing.

Monitors disease progression and treatment response.