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Not medically reviewed. For informational purposes only, to help curious people start a conversation with a healthcare professional.
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Range Atlas is AI-collected and not medically reviewed. It is for informational purposes only, meant to help curious people start a conversation with a healthcare professional. The chart shows how sources disagree, not whether a value is good or bad for you. Color shows what each source's region means, not a recommendation.

mg/dL · 4 sources · 2 countries · spread 4.5x

HDL cholesterol reference ranges

Order test
How to readbounded rangethis level and upthis level and belowOptimal / targetToo low
Source
20 mg/dL5590 mg/dL
Value
Meaning
Labs and hospital systems
<= 40 mg/dL
Too low
<= 50 mg/dL
Too low
>= 60 mg/dL
Optimal
Countries and guidance
>= 39 mg/dL
Optimal

HDL-C normalized to mg/dL (mmol/L times 38.67). Higher is generally considered protective; thresholds differ by sex and source.

Developer QA and conversion details

Unit rule: normalize to common United States display units. Mayo is the tiebreaker, then Quest, then Labcorp. Fixture: 17 markers, 101 rows, 70 source names, 11 conversion rules.

visualShape is stored geometry (band, floor, ceiling, point). regionMeaning is stored polarity (reference, optimal, concern_low, concern_high). Neither is inferred from labels at render time.

Conversion guardrails for HDL cholesterol
mmol/L to mg/dLvalue * 38.67