Homocysteine
Homocysteine is an amino acid in the blood. Elevated levels are considered a risk factor for cardiovascular disease and may indicate vitamin deficiencies.
Category: Cardiac Markers
Also known as: homocysteine, hcy, total homocysteine, plasma homocysteine, Homocyst(e)ine, homocistein
Reference range: 5–15 µmol/L (Source: ABIM)
Standard unit: µmol/L
High values may indicate
High homocysteine levels may indicate increased risk of heart disease and stroke, vitamin B12 deficiency, folate deficiency, or homocystinuria.
Low values may indicate
Low homocysteine levels are generally normal and not clinically significant.
Frequently asked questions
- What is a normal Homocysteine level?
- A typical reference range for Homocysteine is 5–15 µmol/L (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is Homocysteine measured in?
- Homocysteine is most commonly reported in µmol/L. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do Homocysteine 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 Homocysteine over time?
- Yes. Upload results from any lab and BloodId charts your Homocysteine 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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