What Is a Health Score? The A–F Guide to Your Bloodwork
A health score turns complex biomarker data into a single, meaningful number. Here's what it is, how it's calculated, and why it tells you more than a standard lab report ever could.
Get your free health score — upload your PDF and see your A–F grade instantly.
Get My Score →The problem with standard lab reports
When you get a blood test, you receive a report with dozens of numbers. Each one is flagged as "normal," "high," or "low" based on a reference range. That sounds helpful — but the reference ranges are set to capture 95% of the general population, not to identify optimal health.
The result: you can have a glucose of 99, a TSH of 4.1, and a vitamin D of 22 — all technically "normal" — and still feel exhausted, foggy, and unwell. Your lab report says you're fine. But you're not optimal.
What is a health score?
A health score is a single number (0–100) that summarises how well your blood test results align with optimal values for your age and sex. Rather than a list of individual flagged values, it gives you one clear answer to: How healthy am I, right now, based on my bloodwork?
Clariti calculates an overall health score plus individual scores for six domains:
Cardiovascular — LDL, HDL, total cholesterol, triglycerides, hs-CRP
Metabolic — glucose, HbA1c, insulin resistance markers
Kidney — creatinine, BUN, eGFR, uric acid
Liver — ALT, AST, GGT, albumin, bilirubin
Blood — CBC: hemoglobin, RBC, WBC, platelets, ferritin
Inflammatory — CRP, ESR, white blood cell count
What the A–F grades mean
Clariti uses a familiar A–F grading scale so the result is immediately understandable at a glance:
Optimal · 90–100
Ideal range. Lowest disease risk. Maintain what you're doing.
Good · 75–89
Good levels with minor room for improvement. Small lifestyle tweaks move you to A.
Fair · 55–74
Suboptimal but not flagged. This is where many people sit without knowing it. Targeted intervention helps.
Below Optimal · 35–54
Worth discussing with your doctor and making targeted changes soon.
Poor · 20–34
Significantly outside optimal range. Follow up with your doctor.
Critical · 0–19
Far outside optimal or flagged abnormal by your lab. Seek medical attention.
How Clariti calculates your score
Each biomarker is scored on a 0–100 scale based on how close it falls to the peer-reviewed optimal range for your demographic. Scores are weighted by clinical significance and aggregated into domain scores. The overall score is a weighted average across all six domains.
The optimal ranges are drawn from functional medicine research — not the broad population reference ranges used by labs. For example:
| Biomarker | Lab "Normal" | Clariti Optimal |
|---|---|---|
| Fasting Glucose | 70–99 mg/dL | 75–90 mg/dL |
| TSH | 0.4–4.5 mIU/L | 1.0–2.0 mIU/L |
| Vitamin D | 20–50 ng/mL | 40–60 ng/mL |
| hs-CRP | <3.0 mg/L | <1.0 mg/L |
Why A–F Grading Is More Actionable Than Numbers
Raw blood test values are hard to act on — a ferritin of 28 ng/mL means nothing to most people. Translating that into a grade (C for borderline low) immediately tells you: this is something to address. A–F grading also makes trends visible across time: if your metabolic score moved from C to B between annual tests, something you did worked. That feedback loop is what drives lasting behaviour change.
Why this matters for you
A health score turns a confusing lab report into an actionable snapshot. Instead of parsing 30+ individual values, you see one score that tells you how healthy your bloodwork is right now — and six domain scores that show you exactly where to focus.
It also lets you track progress over time. If you make diet, lifestyle, or supplement changes, retest in 3–6 months and upload your new results to see whether your score improved.
Get your free health score
Upload your blood test PDF and get your A–F score across 6 health domains in seconds.
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 →