Overview
ANC = WBC × (neutrophil fraction). When bands are reported separately, most laboratories include bands in ANC (segs + bands).
Clinical Importance
Grade neutropenia and support infection-risk assessment
Monitor chemotherapy nadirs and recovery
Specimen Requirements
- Specimen: whole blood
- Tube: lavender-top K₂EDTA (preferred) or K₃EDTA
- Anticoagulant: EDTA
- Handling: invert gently 8–10 times immediately after draw; do not shake
- Storage: room temperature preferred for prompt analysis; follow analyzer/manufacturer limits
- Stability: analyze as soon as practical (many CBC parameters are stable for several hours at room temperature; verify local procedure). MPV increases with EDTA storage time. Do not freeze whole blood for CBC.
Analytical Method
Calculated from total WBC and the neutrophil (± band) percentage from automated or manual differential. Band inclusion must match institutional reporting policy.
Instruments Used
Automated analyzers
- Sysmex XN / XN-L series hematology analyzers
- Beckman Coulter DxH series hematology analyzers
- Abbott Alinity hq / CELL-DYN hematology analyzers
- Siemens Healthineers ADVIA hematology analyzers
- Mindray BC-series hematology analyzers
- HORIBA Yumizen / ABX hematology analyzers
Manual methods
- Derived from manual differential × WBC when automated absolute counts are unavailable
Reference Values
Typical adult SI examples below follow widely published international hematology practice (e.g., Dacie and Lewis; Henry's). Always interpret against the method- and demographics-specific interval printed on the patient report (CLSI EP28-A3c). Neonatal, pediatric, pregnancy, and altitude intervals differ.
Typical published adult ANC approximates 1.5–7.5 × 10⁹/L; exact limits and band handling are laboratory-specific.
Clinical neutropenia grades (e.g., <0.5 × 10⁹/L as severe) are grading constructs; confirm institutional critical limits separately.
Interpretation
Critical and significant-risk limits are institution-defined (CLSI GP47). Confirm the local call list. Textbook examples are not universal thresholds.
Critical values
- Severe neutropenia commonly appears on critical call lists; verify local ANC threshold (CLSI GP47)
Common Causes of Increased Results
- Neutrophilia; acute stress, infection, inflammation, marrow stimulation patterns
Common Causes of Decreased Results
- Neutropenia; evaluate severity, duration, and smear for dysplasia or left shift
Clinical Significance
- Chemotherapy safety monitoring
- Fever and neutropenia pathways
- Drug-induced neutropenia surveillance
Factors Affecting Results
Pre-analytical
- EDTA artifacts, delayed processing, and mislabeled specimens
- Steroid therapy or physiologic stress can acutely shift neutrophil counts
Analytical
- Misclassification between lymphocytes and monocytes on some automated differentials
- NRBCs inflating WBC if not corrected before absolute calculations
Post-analytical
- Interpreting percentages instead of absolute counts
- Applying adult intervals to pediatric patients
Advantages and Limitations
Advantages
- Clinically actionable absolute value
- Easily tracked serially on CBC differentials
Limitations
- Band definition variability between laboratories
- Does not distinguish marrow production failure from consumption without context
Clinical Pearls
Always compute and report ANC; a 'normal' WBC can conceal life-threatening neutropenia.
References
Authoritative textbooks, guidelines, and reviews supporting this laboratory test reference. Verify reference intervals, critical limits, and method details against institutional protocols and current guideline editions.
Textbooks
- McPherson RA, Pincus MR. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Elsevier; 2021.
- Rodak BF, Carr JH. Rodak's Hematology: Clinical Principles and Applications. 6th ed. Elsevier; 2020.
- Hoffbrand AV, Moss PAH, Pettit JE. Essential Haematology. 8th ed. Wiley-Blackwell; 2019.
- McKenzie SB, Williams JL. Clinical Laboratory Hematology. 4th ed. Pearson; 2022.
- Bain BJ, Bates I, Laffan MA. Dacie and Lewis Practical Haematology. 12th ed. Elsevier; 2017.
- Kaushansky K, et al. Williams Hematology. 10th ed. McGraw-Hill; 2021.
CLSI and Professional Guidelines
- Clinical and Laboratory Standards Institute. Validation, Verification, and Quality Assurance of Automated Hematology Analyzers; Approved Standard. CLSI document H26-A2. CLSI; 2010.
- Clinical and Laboratory Standards Institute. Reference Leukocyte (WBC) Differential Count (Proportional) and Evaluation of Instrumental Methods; Approved Standard. CLSI document H20-A2. CLSI; 2007.
- Clinical and Laboratory Standards Institute. Defining, Establishing, and Verifying Reference Intervals in the Clinical Laboratory; Approved Standard. CLSI document EP28-A3c. CLSI; 2010.
- Clinical and Laboratory Standards Institute. Management of Critical- and Significant-Risk Results. CLSI guideline GP47-Ed1. CLSI; 2015.
Frequently Asked Questions
Common questions about using this Absolute Neutrophil Count (ANC) laboratory test Medical Laboratory Library reference in Medical Laboratory Science education.
What is the Absolute Neutrophil Count (ANC) laboratory test reference used for?
This Medical Laboratory Library page summarizes the clinical importance of Absolute Neutrophil Count (ANC). Review the Clinical Importance section for why the test is ordered in laboratory medicine practice.
Where can I find Absolute Neutrophil Count (ANC) specimen requirements?
See the Specimen Requirements section on this page for specimen information related to Absolute Neutrophil Count (ANC). Confirm collection details against your laboratory protocol.
Where are Absolute Neutrophil Count (ANC) reference values listed?
See the Reference Values section on this Laboratory Library page. Reference ranges can vary by method and population, so verify intervals with your laboratory.
How do I interpret Absolute Neutrophil Count (ANC) results?
Use the Interpretation section for laboratory interpretation framing, including increased and decreased result patterns when provided. Do not treat educational text as a patient-specific diagnosis.
What analytical method is used for Absolute Neutrophil Count (ANC)?
See the Analytical Method section for principle and method notes. Method details may differ by instrument and institutional SOP.
Are related laboratory tests linked from Absolute Neutrophil Count (ANC)?
Yes. The Related Laboratory Tests section lists connected references for continued lookup in the Medical Laboratory Library.
How can I continue learning after reading Absolute Neutrophil Count (ANC)?
Use Continue learning links on this page for related Academy lessons, medical laboratory quizzes, or laboratory case studies when available for this Hematology topic.
What are the clinical pearls for Absolute Neutrophil Count (ANC)?
See the Clinical Pearls section for concise laboratory practice notes associated with Absolute Neutrophil Count (ANC). Apply pearls alongside institutional protocols.
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