HematologyInternal Medicine

Total Count Differential Count (Tcdc-X)

Normal Range
WBC: 4,000-11,000 cells/µL
Sample Type
Whole Blood
Fasting
No
Unit
cells/µL

Function

The TCDC (Total Count and Differential Count) is a fundamental blood test that measures the total number of white blood cells (WBCs) and the percentage of each type (Neutrophils, Lymphocytes, Monocytes, Eosinophils, and Basophils). The 'X' typically refers to an automated or specific platform-specific methodology.

Why it is Ordered

This is one of the most common lab tests, ordered to:

  • Check for infection or inflammation.
  • Monitor the body's response to various treatments (like chemotherapy).
  • Screen for blood disorders such as leukemia or anemia.
  • Evaluate immune system health.

Associated Conditions

  • Leukocytosis: Elevated WBCs, often due to infection, stress, or leukemia.
  • Leukopenia: Low WBCs, possibly due to bone marrow failure, autoimmune diseases, or medication side effects.
  • Eosinophilia: Often linked to allergies or parasitic infections.

Panel Components

This test is a profile comprising the following specific markers:

Eosinophils
%
Neutrophils
%
Monocytes
%
Basophils
%
Lymphocytes
%
Total Leukocyte Count (WBC)
cells/cumm

Why Context Matters

WBC counts are highly dynamic. Recent physical exertion, acute stress, or smoking can cause a transient 'pseudo-leukocytosis' where cells marginated along vessel walls are released into circulation. Steroid medications (like Prednisone) significantly increase neutrophils while decreasing eosinophils, potentially masking or mimicking infection.

Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.

Clinical References

Source-of-truth databases and clinical guidelines for Total Count Differential Count (Tcdc-X):

Research & Guidelines

Related Indicators

Activated Partial Thromboplastin Time (APTT)

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AML Comboquest 9

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Blood Cell Morphology

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DR

Medically Reviewed by Dr. Binoy Babu, MBBS

Board Certified Doctor • 10+ Years Clinical Experience

Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.

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