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Homocysteine (HCY) Unit Converter
Homocysteine (HCY) is a sulfur-containing amino acid intermediate that is naturally produced during the metabolism of **Methionine**. HCY is typically re-metabolized into harmless substances (Methionine or Cysteine) through pathways reliant on **Vitamin B12** and **Folate (Vitamin B9)**.
Elevated HCY levels (Hyperhomocysteinemia) are associated with a significant, independent increase in the risk of **cardiovascular disease (CVD)**, venous thromboembolism (VTE), and neural tube defects in pregnancy. HCY testing is often used to diagnose deficiencies in Vitamin B12 or Folate, or genetic defects like MTHFR polymorphism. This converter facilitates accurate switching between the SI molar unit (µmol/L) and the conventional mass unit (mg/dL).
SI Units
RecommendedMicromoles per liter (Standard International).
Conventional Units
Clinical Context
Reference Range (Fasting): Normal HCY levels are typically 5 – 15 µmol/L.
Levels > 15 µmol/L are classified as hyperhomocysteinemia and warrant investigation for Folate and Vitamin B12 deficiency. High HCY is directly toxic to the lining of the blood vessels (endothelium). The conversion factor relies on MW 135.2 g/mol: 1 mg/dL ≈ 73.96 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., µmol/L). 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 mg/dL) are instantly updated.
Verify Units
Check the SI Units section. µmol/L is the international standard for amino acid analysis.
Reset
Use the Clear button to reset all fields before starting a new calculation.
Frequently Asked Questions & Tips
1 µmol/L ≈ 0.01352 mg/dL.
Yes. Homocysteine levels increase after a protein-rich meal, so a 10–12 hour fast is required for an accurate baseline reading.