Apolipoprotein A1
Apolipoprotein A1 (Apo A1) is the main protein component of HDL ('good') cholesterol. It helps activate enzymes that clear cholesterol from the blood and tissues.
Category: lipids
Also known as: apolipoprotein a1, apo a1, apoa1, apo-a1, apolipoprotein a-1
Reference range: 120–175 mg/dL (Source: ABIM)
Standard unit: mg/dL
High values may indicate
High Apo A1 levels are generally considered protective against cardiovascular disease and are associated with a favorable lipid profile.
Low values may indicate
Low Apo A1 levels may indicate increased risk of cardiovascular disease, metabolic syndrome, familial hypoalphalipoproteinemia, or poorly controlled diabetes.
Frequently asked questions
- What is a normal Apolipoprotein A1 level?
- A typical reference range for Apolipoprotein A1 is 120–175 mg/dL (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is Apolipoprotein A1 measured in?
- Apolipoprotein A1 is most commonly reported in mg/dL. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do Apolipoprotein A1 reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track Apolipoprotein A1 over time?
- Yes. Upload results from any lab and BloodId charts your Apolipoprotein A1 over time against its reference range, so you can see whether the trend is rising, falling, or stable.
Related biomarkers
Source: MedlinePlus, U.S. National Library of Medicine
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