Homocysteine
The Homocysteine test measures an amino acid linked to cardiovascular and neurological health. It helps assess vitamin B status and vascular risk.
Turnaround time
1 day
Biomarkers count
1
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Details about Homocysteine
What is the Homocysteine test?
The Homocysteine blood test measures the level of homocysteine, an amino acid produced during normal protein metabolism. Under healthy conditions, homocysteine is rapidly converted into other compounds using vitamin B12, vitamin B6 and folate.
When this process is impaired, homocysteine accumulates in the blood. Elevated levels are associated with increased cardiovascular risk, endothelial dysfunction, and potential neurological effects.
Homocysteine testing is commonly used in cardiovascular risk assessment, nutritional evaluation, and investigation of unexplained vascular or neurological symptoms.
Why do I need a Homocysteine test?
Raised homocysteine levels may indicate impaired methylation or vitamin deficiency and are linked to increased risk of cardiovascular and cerebrovascular disease.
You may need a Homocysteine test if you:
- Have a family history of heart disease or stroke
- Have unexplained cardiovascular risk
- Have vitamin B12, B6 or folate deficiency
- Experience cognitive or neurological symptoms
- Have a history of blood clots
- Have chronic fatigue
- Follow a restrictive or vegan diet
- Are being assessed for metabolic or methylation issues
Symptoms or conditions associated with high homocysteine may include:
- Cardiovascular disease
- Stroke or TIA
- Cognitive decline
- Peripheral vascular disease
- Pregnancy complications
Benefits of the Homocysteine test
- Assesses cardiovascular risk
Elevated levels are linked to vascular disease. - Identifies vitamin B deficiencies
Sensitive marker for B12, B6 and folate status. - Supports stroke risk evaluation
Useful in cerebrovascular assessment. - Relevant for neurological health
Elevated levels may affect cognition and nerves. - Guides nutritional intervention
Supports targeted supplementation. - Clinically recognised biomarker
Used in cardiovascular and metabolic medicine. - Useful in preventive health screening
Identifies modifiable risk factors. - Simple blood test
Requires only a single sample.
Step by step – how the test works
You can access Homocysteine testing UK-wide through two options:
- Clinic appointment
Choose your nearest UK clinic, where a healthcare professional will take your blood sample. - At-home or hotel visit (£60 extra)
A qualified phlebotomist comes to your home or hotel, so you don’t need to travel.
Your sample is analysed in an accredited UK laboratory, and results are delivered securely.
Your results explained
Low homocysteine levels
Generally not clinically concerning and usually reflect adequate vitamin status.
Typical UK reference range:
- < 5 µmol/L
Normal homocysteine levels
Suggest balanced methylation and adequate vitamin B status.
Typical UK reference range:
- 5–15 µmol/L
High homocysteine levels
Indicate increased cardiovascular risk or possible vitamin deficiency.
Typical UK reference range:
- > 15 µmol/L
Reference ranges may vary slightly between laboratories and clinical context.
How It Works
Simple steps to get your results
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Choose your test online and book in seconds. Select your preferred clinic location or home visit option.
Visit or Test at Home
Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
Get Your Results
Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.
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WhatsApp UsHow to Prepare for Your Test
Follow these guidelines for accurate results
Sample Timing
Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.
Fasting & Hydration
Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.
Medications & Supplements
Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.
Hormones & Menstrual Cycle
For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.
If you have any questions or special circumstances, our team is happy to advise before your appointment.