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Full Blood Count

White Blood Cell Count (WBC)

White blood cell count is the total number of circulating leukocytes — neutrophils, lymphocytes, monocytes, eosinophils, and basophils — measured in ×10⁹ cells per litre of blood. It is the first-line marker of acute infection, but its real value sits at the chronic end: persistent low-grade elevation is one of the most reliable predictors of cardiovascular events, cancer, and mortality. WBC is the ninth biomarker in the Levine PhenoAge composite.

Optimal Ranges

Clinical (NHS) Range

4.0-11.0 ×10⁹/L

×10⁹/L

Performance-Optimised Range

4.5-6.5 ×10⁹/L

×10⁹/L

The clinical range defines what is considered medically “normal” — broad enough to cover 95% of the population. The performance range reflects where research and clinical experience suggest most people feel and function at their best.

Why It Matters

Why WBC matters for performance

Most people focus on whether WBC is high enough to fight infection. The longevity story is the opposite: a chronically elevated WBC, even within the 'normal' 4-11 range, is a smoking gun for chronic inflammation. A baseline WBC above 7 carries roughly twice the mortality risk of a baseline below 5, independent of CRP. The performance target sits in the 4.5-6.5 range — high enough for robust immune function, low enough to reflect a quiet inflammatory environment.

Symptoms

Signs your levels may be off

Low / Deficiency

  • Mouth ulcers and oral thrush
  • Frequent or prolonged infections
  • Unexplained fevers
  • Slow wound healing

High / Excess

  • Often asymptomatic when only mildly elevated
  • Fatigue and low-grade malaise (chronic inflammation pattern)
  • Joint or muscle aches (chronic inflammation pattern)
  • Acute infection signs (fever, localised pain) if reactive

Dietary Sources

Foods that support WBC levels

WBC count is produced internally — diet controls the inflammation environmentOmega-3 fish (salmon, mackerel, sardines) for resolution of inflammationExtra virgin olive oil for oleocanthalBerries, leafy greens, brassicas for polyphenolsFermented foods (kefir, sauerkraut, kimchi) for gut-immune balance

Supplementation

Evidence-based supplementation

If WBC is chronically elevated, the protocol is anti-inflammatory: address visceral adiposity, sleep quality, periodontal health, and any low-grade gut or oral infections. Omega-3 at 2-3 g EPA+DHA daily lowers WBC and CRP in published trials. Curcumin (with piperine) and vitamin D sufficiency both contribute. Direct WBC suppression is never the goal — the goal is removing the inflammatory stimulus.

Research

Key study

An epigenetic biomarker of aging for lifespan and healthspan

Levine ME, Lu AT, Quach A, et al.

Aging (Albany NY) (2018)

DOI: 10.18632/aging.101414

Related Biomarkers

Inflammation

hs-CRP (High-Sensitivity C-Reactive Protein)

Optimal: Below 1.0 mg/L

Inflammation

Ferritin (Iron Stores)

Optimal: 80-150 ng/mL

Vitamins & Minerals

Vitamin D (25-OH)

Optimal: 100-150 nmol/L

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WBC is included in the Helvy 50+ biomarker panel. Get your results in 5 days with a personalised protocol.

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This content is for educational purposes only and does not constitute medical advice. Your data suggests areas for optimisation, but any concerns should be discussed with a qualified healthcare professional. If your results flag values outside safe ranges, we recommend consulting your GP.