Normal Blood Test Ranges by Age and Sex
Standard lab reference ranges tell you the minimum threshold. These tables show what is actually optimal — and where the two differ significantly.
Don't read tables manually — let Clariti score your results automatically for your age and sex.
Upload My Report →Why "normal" and "optimal" are different
Lab reference ranges are calculated statistically — they represent the middle 95% of a large population sample. Being "normal" means you're not an outlier, not that you're thriving. The tables below show both ranges side by side so you can see exactly where the gap lies.
Why Age-Adjusted Reference Ranges Matter
Standard lab reference ranges are derived from mixed adult populations. But several key markers change systematically with age: testosterone declines by 1–2% per year from age 30; eGFR naturally falls by ~1 mL/min/year from age 40; ferritin typically rises in women after menopause; and TSH upper limits are slightly more generous in older adults. Interpreting results against age-appropriate benchmarks prevents both over- and under-treatment.
Metabolic markers
| Biomarker | Lab Reference | Clariti Optimal | Unit |
|---|---|---|---|
| Fasting Glucose | 70–99 | 75–90 | mg/dL |
| HbA1c | <5.7% | <5.4% | % |
| Fasting Insulin | 2–25 | 2–8 | µIU/mL |
Cardiovascular markers
| Biomarker | Lab Reference | Clariti Optimal | Unit |
|---|---|---|---|
| LDL Cholesterol | <130 | <100 | mg/dL |
| HDL (Male) | >40 | >60 | mg/dL |
| HDL (Female) | >50 | >70 | mg/dL |
| Triglycerides | <150 | <100 | mg/dL |
| hs-CRP | <3.0 | <1.0 | mg/L |
Thyroid markers
| Biomarker | Lab Reference | Clariti Optimal | Unit |
|---|---|---|---|
| TSH | 0.4–4.5 | 1.0–2.0 | mIU/L |
| Free T4 | 0.8–1.8 | 1.0–1.5 | ng/dL |
| Free T3 | 2.3–4.2 | 3.0–4.0 | pg/mL |
Vitamins and minerals
| Biomarker | Lab Reference | Clariti Optimal | Unit |
|---|---|---|---|
| Vitamin D (25-OH) | 20–50 | 40–60 | ng/mL |
| Ferritin (Male) | 24–336 | 70–150 | ng/mL |
| Ferritin (Female) | 11–307 | 50–100 | ng/mL |
| Vitamin B12 | 200–900 | 500–900 | pg/mL |
| Magnesium | 1.7–2.2 | 2.0–2.2 | mg/dL |
The Difference Between Normal-for-Age and Optimal
Age-adjusted ranges tell you what is statistically typical for your age group — not what is ideal. A testosterone of 320 ng/dL is within range for a 65-year-old, but the man may have significant symptoms of deficiency that would respond to treatment. Optimal values represent what is associated with best health outcomes in research — not just what the average person has.
Kidney markers
| Biomarker | Lab Reference | Clariti Optimal | Unit |
|---|---|---|---|
| Creatinine (Male) | 0.74–1.35 | 0.8–1.1 | mg/dL |
| Creatinine (Female) | 0.59–1.04 | 0.6–0.9 | mg/dL |
| eGFR | >60 | >90 | mL/min/1.73m² |
| BUN | 7–25 | 10–18 | mg/dL |
| Uric Acid (Male) | 3.4–7.0 | 3.5–5.5 | mg/dL |
Optimal ranges are based on functional medicine research and may differ from your lab's reference ranges. This table is for educational purposes only. Always consult your doctor for medical advice.
See where your results actually stand
Clariti scores every biomarker automatically against optimal ranges for your age and sex.
Analyze My Blood Test →More from the blog
Medical Disclaimer
This article is for educational purposes only and does not constitute medical advice. Reference ranges, supplement dosages, and nutritional information mentioned are general educational guidance from published research—not personalised recommendations. Do not use this content to self-diagnose or self-treat any condition. Always consult a qualified healthcare provider before making any changes to your health regimen, medications, or supplements.
See exactly where your results stand
Upload your blood test PDF and get a free A–F score across all 6 health domains in seconds.
Analyze My Blood Test →