Who is this especially useful for?
- ✓Individuals with metabolic syndrome or its components
- ✓Those with elevated triglycerides (>150 mg/dL)
- ✓People with low HDL cholesterol
- ✓Patients with type 2 diabetes or prediabetes
- ✓Those with family history of early cardiovascular disease
AIP is particularly valuable when LDL-C is 'normal' but cardiovascular risk seems elevated.
What is AIP?
The Atherogenic Index of Plasma (AIP) is calculated as log₁₀(Triglycerides / HDL-C), where both values are expressed in mmol/L. Introduced by Dobiásová and Frohlich in 2001, this logarithmic transformation provides a powerful predictor of cardiovascular disease risk.
AIP reflects the balance between atherogenic (triglyceride-rich) and protective (HDL) lipoproteins. Research demonstrates it correlates strongly with small dense LDL particle size (r = 0.803), the cholesterol esterification rate, and overall plasma atherogenicity.
Example Calculation
1.2
Triglycerides (mmol/L)
1.5
HDL (mmol/L)
-0.10
log₁₀(1.2 / 1.5) = -0.10 — Negative AIP indicates excellent cardiovascular protection.
The Power of Logarithmic Transformation
Unlike simple TG/HDL ratio, the logarithmic transformation of AIP creates a more linear relationship with cardiovascular outcomes and allows for negative values when HDL exceeds triglycerides — indicating very favorable lipid profiles. This is common in athletes and low-carb dieters.
Uses triglycerides and HDL from your lipid panel.
Why AIP Matters
- LDL Particle Size Prediction: AIP correlates strongly (r = 0.803) with LDL particle size. High AIP indicates small dense LDL (Pattern B), low/negative AIP indicates large buoyant LDL (Pattern A)
- Negative Values Are Possible: When HDL exceeds triglycerides, AIP becomes negative — indicating exceptional cardiovascular protection
- Residual Risk Detection: Identifies cardiovascular risk that persists despite statin therapy
- Rapid Response to Diet: AIP responds faster to dietary changes than LDL-C — improvements visible within 2-4 weeks
Three Perspectives on AIP
Different health paradigms interpret AIP thresholds differently:
AIP Interpretation by Paradigm
Standard Medical
Research Consensus
Metabolic Optimization
Standard Medical
Dobiásová validation studies. < 0.11 low risk, > 0.21 high risk.
Identify individuals at elevated cardiovascular risk for intervention.
Research Consensus
Cardiovascular outcome studies. Negative AIP indicates excellent protection.
Target < 0.00 (negative) for optimal cardiovascular health.
Metabolic Optimization
Low-carb/ketogenic context. Excellent TG/HDL typical for adapted individuals.
AIP > 0.10 unusual on strict keto — check for secondary causes.
How to Test
💡 Pro tip: While fasting is preferred, AIP can be calculated from non-fasting samples with reasonable accuracy due to its ratio-based nature.
How to Improve Your AIP
Dietary Approaches
Reduce refined carbohydrates
Major driver of elevated triglycerides
Limit fructose
Particularly effective at raising TG
Increase omega-3 fatty acids
Fatty fish, fish oil significantly lower TG
Consider carbohydrate restriction
Particularly effective for high TG
Lifestyle Modifications
Regular aerobic exercise
Raises HDL, lowers TG
Achieve healthy body weight
Weight loss improves both TG and HDL
Limit alcohol intake
Significant impact on triglycerides
Improve sleep quality
Poor sleep worsens metabolic markers
Medical Considerations
Fibrates and omega-3 prescriptions
Highly effective for TG reduction
Niacin
Raises HDL significantly
Address underlying conditions
Hypothyroidism, diabetes affect lipids
AIP vs TG/HDL Ratio
AIP is the log₁₀ transformation of TG/HDL ratio (in mmol/L). This mathematical conversion creates a more linear relationship with cardiovascular risk and correlates more precisely with LDL particle size. Both metrics use the same blood values but AIP is preferred in research settings.
Frequently Asked Questions
Key Takeaways
- 1AIP = log₁₀(Triglycerides / HDL-C) — both in mmol/L
- 2**Negative AIP** is possible and excellent — means HDL exceeds triglycerides
- 3Correlates strongly (r = 0.803) with LDL particle size
- 4High AIP indicates small dense LDL (Pattern B), increased risk
- 5Low/negative AIP indicates large buoyant LDL (Pattern A), cardioprotective
- 6Responds faster to dietary changes than LDL-C (2-4 weeks)