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Total Homocysteine (Serum)

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

This test measures the amount of homocysteine, an amino acid that can build up in your blood and may be linked to certain health risks.

Quick summary

["Homocysteine levels help assess your risk for heart disease and other conditions."]

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

Key facts at a glance

LOINC
61275-4
Short code
Hop IgE/IgE total %
Synonyms
Hop IgE/IgE total %
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your doctor may order this test if you have a history of heart disease, stroke, or kidney problems, or if you’re taking certain medications (like folic acid supplements) that can affect homocysteine levels. It may also be checked during routine blood work or if you have symptoms like fatigue, numbness, or memory issues.

What Does the Result Mean?

Higher-than-normal levels might suggest an increased risk of blood clots, heart disease, or nerve damage. Lower levels may indicate folate or vitamin B12 deficiency, though this is less common. Your doctor will interpret results in the context of your overall health.

Common Causes of Abnormal Results

Factors like genetics, kidney disease, certain medications (e.g., diuretics, statins), or deficiencies in vitamins (B6, B9, or B12) can influence homocysteine levels. Lifestyle choices, such as smoking or poor diet, may also play a role.

What Can You Do to Manage Levels?

If your levels are high, your doctor might recommend dietary changes (e.g., more leafy greens, nuts, or fish) or supplements (like folate or vitamin B12) to help lower them. Avoiding smoking and managing conditions like diabetes or hypertension may also help.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is primarily used to evaluate cardiovascular risk and identify potential underlying conditions like vitamin deficiencies or genetic factors that may contribute to blood clot formation or nerve damage. It’s not a standalone diagnostic tool but often used alongside other tests for a fuller picture.

Short name

Total Homocysteine

Frequently asked questions

What triggers a homocysteine test?
A homocysteine test may be ordered if you have symptoms like fatigue, numbness, or memory problems, if you have a family history of heart disease or stroke, or if you’re taking medications that affect homocysteine levels. Your doctor may also check it if you have kidney disease or during routine blood work.
How often should I get this test?
There’s no standard schedule for homocysteine testing. Your doctor will decide based on your health status, risk factors, and other test results. If you have a history of high risk, they may recommend it more frequently.
Can diet affect homocysteine levels?
Yes, diet plays a role. Foods rich in folate (leafy greens), vitamin B6 (nuts, seeds), and vitamin B12 (fish, eggs) can help lower homocysteine levels. Conversely, a diet high in processed foods or alcohol may raise them.
  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