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Apolipoprotein A-1 (ApoA-I) Unit Converter
Apolipoprotein A-1 (ApoA-I) is the major protein component of High-Density Lipoprotein (HDL) particles, often referred to as “good cholesterol.” Produced in the liver and intestine, ApoA-I is the structural backbone of HDL and activates Lecithin-Cholesterol Acyltransferase (LCAT), the enzyme responsible for esterifying free cholesterol.[Image of lipoprotein structure with apolipoproteins]
ApoA-I plays a central role in Reverse Cholesterol Transport, the process of removing excess cholesterol from peripheral tissues and transporting it to the liver for excretion. Low levels of ApoA-I are a strong independent risk factor for premature Cardiovascular Disease (CVD) and are seen in genetic disorders like Tangier disease. Conversely, high levels are generally cardioprotective. This converter ensures accurate switching between the international standard (g/L) and the US clinical standard (mg/dL).
SI Units
RecommendedGrams per liter (Standard International).
Conventional Units
Clinical Context
ApoA-I vs. HDL-C: While HDL-Cholesterol measures the cholesterol payload, ApoA-I measures the actual number of anti-atherogenic particles. Reference ranges vary by sex, typically 1.2 – 1.8 g/L for men and 1.4 – 2.2 g/L for women.
The ApoB / ApoA-I Ratio is increasingly used as a superior predictor of cardiovascular risk compared to traditional lipid ratios. A lower ratio indicates lower risk. The conversion factor relies on the molecular weight (~28 kDa): 1 g/L ≈ 35.7 µmol/L.
Clinical References
How to Use This Calculator
Follow these steps to get accurate clinical conversions instantly.
Enter Values
Input your laboratory results into the corresponding unit field (e.g., mg/dL). You can use either dot or comma decimals.
Automatic Conversion
The calculator works in real-time. As you type in one field, all other units (like g/L or µmol/L) are instantly updated.
Verify Units
Check the SI Units section. g/L is the standard reporting unit in many international guidelines.
Reset
Use the Clear button to reset all fields before starting a new calculation.
Frequently Asked Questions & Tips
Yes, mg/dL and mg% are equivalent. However, g/L is the preferred SI unit.
Molar units allow direct comparison with ApoB to calculate the ApoB/ApoA-I ratio, a precise metric for heart disease risk.