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Homocysteine (Substance Concentration) in Serum/Plasma

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of homocysteine, a type of amino acid, in your blood. It helps assess risks related to certain genetic conditions and heart health.

Quick summary

["Homocysteine levels can indicate genetic risks for heart disease or other health issues."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
30070-7
Short code
Cystathionin Amn-sCnc
Synonyms
Cystathionin Amn-sCnc
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your doctor may recommend this test if you have a family history of heart disease, stroke, or certain genetic disorders like homocystinuria. It may also be used to monitor treatment for conditions affecting homocysteine levels, such as vitamin deficiencies.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast for 8–12 hours before the test if it’s part of a broader metabolic evaluation. Bring any medications you’re taking to your appointment.

What the Test Involves

A healthcare provider will draw blood from a vein in your arm. The sample is sent to a lab for analysis using a specialized method to measure homocysteine concentration.

What the Results Mean

Results help identify elevated homocysteine levels, which may signal increased risk for vascular problems. Your doctor will interpret results in the context of your overall health and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Elevated homocysteine levels are linked to higher risks of cardiovascular disease, blood clots, and nerve damage. It may also be associated with certain genetic conditions, such as methylmalonic aciduria or homocystinuria, which require specialized management.

Short name

Homocysteine Level

Frequently asked questions

What causes elevated homocysteine levels?
Elevated homocysteine can result from genetic factors, vitamin deficiencies (like folate or B12), kidney disease, or certain medications. Lifestyle factors, such as smoking or poor diet, may also play a role.
How are homocysteine levels typically treated?
Treatment often involves dietary changes (e.g., increasing folate, vitamin B6, and B12), lifestyle modifications (e.g., quitting smoking), and sometimes supplements if deficiencies are confirmed. Your doctor will tailor recommendations to your needs.
Can homocysteine levels be lowered naturally?
Yes, improving diet (e.g., more leafy greens, nuts, and fish), staying hydrated, and managing chronic conditions (like diabetes) can help lower homocysteine levels naturally. Always discuss changes with your healthcare provider before making significant adjustments.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy