Atherogenic Index of Plasma: Clinical Guide

Overview

Calculates the base-10 logarithm of the triglyceride-to-HDL cholesterol ratio using molar concentrations.

Clinical Significance

AIP is a research-derived lipid index associated with lipoprotein particle characteristics and cardiometabolic risk. It is not a replacement for guideline-based risk estimation or LDL-C treatment targets.

When to Use

• Use as an adjunctive lipid index when both triglycerides and HDL-C are available in mmol/L.
• Use primarily for risk characterisation or research rather than as a treatment target.
• Interpret within the full cardiometabolic profile.

How It Is Calculated

• AIP = log10(triglycerides ÷ HDL cholesterol), with both values in mmol/L.
• The calculator validates the required inputs before applying the equation and rounds only the displayed result.

Interpretation

• AIP is a research-derived lipid index associated with lipoprotein particle characteristics and cardiometabolic risk. It is not a replacement for guideline-based risk estimation or LDL-C treatment targets.
• Review the component values and assumptions as well as the final result.

Worked Example

Enter clinically plausible values in the stated units. MedicalC applies: AIP = log10(triglycerides ÷ HDL cholesterol), with both values in mmol/L. Review the displayed result against the source data and the relevant clinical pathway.

Patient Considerations

• Confirm that the patient and clinical setting match the population or physiologic assumptions behind the equation.
• Consider whether treatment, organ function, pregnancy, body composition, sampling conditions or acute illness materially alter interpretation.
• Use serial calculations only when methods and units remain comparable.

Limitations

• Cut-offs vary and are not universally adopted in clinical guidelines.
• The result changes with fasting status and triglyceride variability.
• It does not replace validated cardiovascular-risk calculators.

Clinical Pearls

• Both inputs must be in mmol/L because the logarithmic ratio was developed using molar values.
• AIP may change substantially when triglycerides change.
• Document fasting status when relevant.

Common Mistakes

• Entering mg/dL values.
• Using AIP as a diagnosis.
• Ignoring conventional risk factors and established lipid targets.

Evidence Base

The implementation uses the published or established relationship: AIP = log10(triglycerides ÷ HDL cholesterol), with both values in mmol/L. The cited source should be reviewed alongside current specialty guidance before clinical deployment.

References

1. Dobiášová M, Frohlich J. The plasma parameter log(TG/HDL-C) as an atherogenic index. Clin Biochem. 2001. — Primary publication, authoritative guideline or recognised clinical source supporting the calculation.