ApoA1
The optimal range for ApoA1 (Apolipoprotein A1) is commonly cited as ≥140 mg/dL; ApoB:ApoA1 ratio <0.6, tighter than the standard lab reference range of 120–160 mg/dL (women slightly higher). The structural protein of HDL - a more reliable marker of protective cholesterol function than HDL-C alone.
How ApoA1 ranges relate
The standard lab range vs the optimization-focused target. Illustrative trajectory shows what a 12-week improvement pattern looks like — not real user data.
What ApoA1 Measures
ApoA1 is the main structural protein on HDL particles. Just as ApoB counts atherogenic particles, ApoA1 counts protective particles. The ApoB:ApoA1 ratio has emerged as one of the cleanest lipid-based risk predictors - INTERHEART and many subsequent studies show it outperforms LDL-C:HDL-C.
Unlike HDL-C, which can be artificially elevated by alcohol or dysfunctional HDL states, ApoA1 directly counts functional HDL particles.
What Affects This Biomarker
ApoA1 is influenced by: exercise (aerobic raises it), genetics, estrogen (higher in premenopausal women), alcohol (modest elevation), niacin (classical raiser but now rarely used), and CETP inhibitors. Insulin resistance and metabolic syndrome lower it.
In the Context of Peptide Protocols
Pair with ApoB - the ratio is the useful number. Target ApoB:ApoA1 <0.6 for primary prevention, <0.5 for established CV risk. Recheck every 6 months alongside ApoB during any cardiovascular-risk-modifying protocol.
Related Reading
Frequently Asked Questions
What does ApoA1 measure?
ApoA1 is the main structural protein on HDL particles. Just as ApoB counts atherogenic particles, ApoA1 counts protective particles. The ApoB:ApoA1 ratio has emerged as one of the cleanest lipid-based risk predictors - INTERHEART and many subsequent studies show it outperforms LDL-C:HDL-C.
What is the optimal range for ApoA1?
The optimal range for ApoA1 is commonly cited as ≥140 mg/dL; ApoB:ApoA1 ratio <0.6. The standard lab reference range is 120–160 mg/dL (women slightly higher).
What affects ApoA1 levels?
ApoA1 is influenced by: exercise (aerobic raises it), genetics, estrogen (higher in premenopausal women), alcohol (modest elevation), niacin (classical raiser but now rarely used), and CETP inhibitors. Insulin resistance and metabolic syndrome lower it.
Where This Fits in Your Panel
ApoA1 is one marker on a fuller panel. The Peptide Blood Work Checklist lays out the complete baseline panel, what to add by protocol type, and when to retest.
See the full blood work checklist →Upload any lab PDF and MyProtocolStack maps your values to ApoA1 and 40+ other biomarkers. StackAI interprets the trend in context of your protocol.
Start tracking →Last reviewed: June 2026
Informational only - not medical advice. Reference ranges vary by lab and individual context. Work with a licensed provider to interpret your specific results.