Metabolic biomarkers
Foundational labs plus the early insulin-resistance signals most standard panels miss.
Key takeaways
- Fasting insulin and HOMA-IR detect metabolic drift years before glucose moves.
- Every target below is an optimal range, not a standard lab reference range.
- GGT is an early liver-stress signal and an independent cardiovascular risk marker.
- Most of these markers respond to the same interventions, which is why the protocol stays short.
Reference ranges are built from population averages, including people who are already unwell. Normal means you are not in the bottom slice of that population. Optimal means your body is actually performing well. The gap between those two standards is where most preventable health decline lives. Baseline evaluates every marker against optimal ranges and connects it to a protocol.
Every optimal range below is the target Baseline follows, not the standard reference range a typical lab report uses. Being within range on a standard panel and being optimal by these numbers are two different things, and that gap is the whole point.
CBC (Complete Blood Count). Screens for anemia, immune status, and platelet function. Foundational for anyone starting peptide or GLP-1 protocols, since anemia significantly affects energy, recovery, and exercise tolerance. Standard: normal reference ranges by component. Optimal: all components within optimal sub-ranges. Moved by: iron optimization, nutrition, evaluation of underlying causes.
NLR (Neutrophil-to-Lymphocyte Ratio). Calculated from the neutrophil and lymphocyte percentages already on a standard CBC, no extra test required. Reflects the balance between your immune system's first responders and its longer term defenses, a useful signal most standard panels never surface on their own. Standard: not reported on a standard panel. Optimal: under 1.8. Moved by: sleep quality, stress management, reducing chronic inflammation, addressing infection or illness.
CMP (Comprehensive Metabolic Panel). Includes kidney function, liver enzymes, electrolytes, and fasting glucose. Required baseline for anyone starting a protocol. Standard: standard reference ranges. Optimal: glucose 72 to 85 mg/dL, kidney and liver markers in optimal sub-ranges. Moved by: diet, hydration, alcohol reduction, medication review.
HOMA-IR. Calculated from fasting insulin and fasting glucose. A more complete picture of insulin resistance than either value alone. Most labs do not calculate or report this automatically. Standard: under 2.0. Optimal: under 1.0. Moved by: Zone 2 cardio, time restricted eating, berberine, dietary carbohydrate quality, GLP-1 therapy.
Fasting Insulin. The most sensitive early marker for insulin resistance. Detects metabolic dysfunction years before blood glucose becomes abnormal. Most standard panels omit this, and standard labs flag nothing until levels are much higher. Standard: up to 25 µIU/mL. Optimal: 2 to 5 µIU/mL. Moved by: Zone 2 cardio, time restricted eating, berberine, GLP-1 therapy.
HbA1c. Three month average blood sugar. The gap between non-diabetic normal and metabolic optimal is clinically significant. Standard: under 5.7% (non-diabetic). Optimal: 4.8 to 5.2%, acceptable to 5.3%. Moved by: dietary carbohydrate quality, exercise, GLP-1 therapy.
Fasting Glucose. Best interpreted alongside fasting insulin and HbA1c for a complete metabolic picture. Standard: under 100 mg/dL. Optimal: 72 to 85 mg/dL. Moved by: same interventions as fasting insulin.
GGT (Gamma-Glutamyl Transferase). A liver enzyme and one of the earliest indicators of liver stress from alcohol, metabolic dysfunction, or medication burden. Also an independent cardiovascular risk marker at elevated levels, often overlooked in standard panels. Standard: under 55 U/L (men), under 38 U/L (women). Optimal: under 20 U/L men (ideal under 15), under 15 U/L women (ideal under 10). Moved by: alcohol reduction, dietary fat quality, weight management, reduced medication burden where possible.
Vitamin D (25-OH). Affects immune regulation, hormonal function, mood, and cellular health. Deficiency is common, particularly in indoor populations. Standard: 30 to 100 ng/mL. Optimal: 60 to 90 ng/mL, do not exceed 99. Moved by: D3 and K2 supplementation, moderate sun exposure.
What this means for you
Ask for fasting insulin on your next draw. It is inexpensive, rarely ordered, and the single most informative addition to a standard metabolic panel.