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Biochemistry · Additional topics

Leukocytes in complete blood count

*Leucocyti*, *WBC*

A complete blood count includes the evaluation of leukocyte levels and their differential count percentages. Changes in these parameters, such as a left shift or anethesinophilia/aneosinophilia, reflect the current state of the body and require a comprehensive assessment along with other general clinical tests.

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Leukocyte level6.0 × 10³/mm³ in the presented clinical example
Band neutrophils10% — indicates a left shift in the leukocyte differential count
Segmented neutrophils46% of the total cell count
Eosinophils0% — a state of anethesinophilia/aneosinophilia
2 min readFor medical studentsUpdated 10.10.2026
Material prepared by WhiteCoat Pro editorial team based on platform study guidesPending instructor review

Leukocyte differential parameters

Differentiated cell counting as part of a complete blood count allows for a detailed assessment of the cellular composition. The analyzed data show the following parameters:

  • Band neutrophils account for 10%, which indicates a left shift in the leukocyte differential count.
  • Segmented neutrophils are at 46%.
  • Lymphocytes account for 36%.
  • Monocytes are determined at 8%.
  • Eosinophils are absent (0%), which is characterized as aneosinophilia.
  • The total leukocyte count (WBC) is 6.0 × 10³/mm³, and hemoglobin (Hb) is 110 g/L.

General clinical and standard tests

For comprehensive diagnostics and as a standard preoperative minimum, patients are recommended a set of examinations:

  1. Urinalysis (UA).
  2. Complete blood count, including determination of hemoglobin, red blood cells (RBC), platelets (PLT), leukocytes with a differential count, reticulocytes, and erythrocyte sedimentation rate (ESR).
  3. General therapeutic blood chemistry panel.
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Blood biochemical profile

Blood chemistry testing includes the evaluation of multiple parameters distributed across functional groups:

  • Enzymes: lactate dehydrogenase (LDH), alanine aminotransferase (ALT), aspartate aminotransferase (AST), and alkaline phosphatase.
  • Renal and hepatic panels, protein metabolism: urea, creatinine, albumin, total protein, and total bilirubin.
  • Electrolytes: potassium (K), sodium (Na), total calcium (Ca), and chlorides (Cl).
  • Specific marker: beta-2 microglobulin.

Note: the attending physician may include additional parameters in the examination plan based on the specific clinical situation.

How to memorize

P10 — band cells "went" left (left shift at 10%), and eosinophils are at zero — aneosinophilia (0%).

Class and exam questions

What does a band neutrophil count of 10% mean?

A band neutrophil value of 10% indicates a left shift in the leukocyte differential count.

What is the term for the condition when eosinophils are completely absent in the blood?

The absence of eosinophils (0%) in the test results is termed aneosinophilia.

What main parameters are included in a standard hematology blood test?

A complete blood count includes hemoglobin, red blood cells, platelets, leukocytes with a differential count, reticulocytes, and ESR.

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What else to study on this topic

  • Evaluation of urinalysis in clinical practice
  • The role of liver enzymes and function tests in blood chemistry
  • Significance of electrolyte balance (potassium, sodium, calcium, chlorides)
  • Renal function parameters: creatinine and urea
  • Criteria and diagnostic significance of the erythrocyte sedimentation rate (ESR)

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