Absolute Natural Killer Cells (NK Cells (CD16+ CD56+))
Large granular lymphocytes expressing CD56 and CD16 (Fc-gamma-RIII) that destroy virus-infected and malignant cells without prior sensitization.
Standard vs. Optimal Reference Rangescells/uL
Standard reference intervals represent the statistical 95% distribution of unselected commercial populations. Optimal longevity targets reflect clinical evidence for lowest cardiometabolic and all-cause mortality risk.
Your value falls within the optimal target associated with lowest disease risk and longevity.
100 - 400 cells/uL (5 - 20% of lymphocytes)
General reference distribution across unselected commercial populations.
150 - 350 cells/uL
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Regulated by a balance of killer cell immunoglobulin-like receptors (KIRs); kills target cells lacking MHC class I ('missing self' hypothesis).
Differential Diagnosis
Elevated Levels (NK Cells (CD16+ CD56+) High)
- •Robust innate immune antiviral and antitumor surveillance (>150 cells/uL)
Low Levels (NK Cells (CD16+ CD56+) Low)
- •Chronic fatigue syndrome / ME/CFS (blunted NK cytotoxicity)
- •Severe primary NK cell immunodeficiencies
- •High susceptibility to severe herpesvirus (EBV, VZV, CMV) infections
Technical Reference & Deep Dive
Biochemistry & Enzymatic Pathways
Longevity Risk Architecture & Epidemiology
Pre-Analytical Caveats & Diagnostic Workup
Pre-Analytical Considerations:
Specimen collection should follow standardized phlebotomy protocols. Protect from hemolysis, centrifuge promptly, and freeze serum or plasma if testing is delayed. Patient should be in a resting, fasting state where indicated.
Reflexive Testing Protocol:
- Confirmatory testing and secondary biomarker quantification for NK Cells (CD16+ CD56+)
- Targeted organ system imaging or functional dynamic testing related to innate antitumor & viral surveillance
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of Absolute Natural Killer Cells - The New England Journal of Medicine (2021). PMID: 34190124
- [2]NK Cells (CD16+ CD56+) Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35422901
Associated Longevity Guides & Clinical Calculators
Medicine 3.0Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Absolute Natural Killer Cells (NK Cells (CD16+ CD56+)) into overall healthspan optimization.