Homocysteine Blood Test: An Important Marker for Heart and Brain Health
Homocysteine is a sulphur-containing amino acid produced as a byproduct of methionine metabolism. It is an important marker in health and disease. Elevated levels are thought to result from abnormalities in the methylation pathway, which is critical for immune regulation and inflammation. High homocysteine is an independent risk factor for heart disease, stroke, dementia, Alzheimer's disease, depression, and recurrent miscarriage. Wellth offers this test through accredited Swedish laboratories, often alongside MMA testing for comprehensive B-vitamin and cardiovascular assessment.
Why Test Homocysteine?
Testing homocysteine is essential for identifying cardiovascular risk factors and nutrient deficiencies, particularly in vitamins B6, B12, and folate. It is especially important for individuals with a personal or family history of high homocysteine, heart disease, or stroke. Research shows optimal homocysteine ranges from 7 to 11 micromol/L, with stroke incidence increasing above 11 micromol/L. For those planning pregnancy, homocysteine testing is also critical, as elevated levels in the first trimester can affect pregnancy outcomes.
What Do High Homocysteine Levels Mean?
High homocysteine (hyperhomocysteinaemia) can indicate vitamin B12 or folate deficiency, kidney conditions, certain genetic polymorphisms such as MTHFR 677CT, or lifestyle factors including smoking, high coffee consumption, and chronic stress. It increases the risk of ischaemic stroke, heart disease, blood clots, and cognitive decline. Homocysteine levels tend to increase with age, and women's levels may rise after menopause due to decreased oestrogen production.
What Do Low Homocysteine Levels Mean?
Low homocysteine (hypohomocysteinaemia) can be caused by increased glutathione production, low intake of vitamins B9 and B12, low methionine and cysteine intake, or an inherently low MTHFR enzyme level. Since animal products are the main source of methionine, vegans and vegetarians may be at increased risk. Low homocysteine may also indicate oxidative stress if the body is producing more glutathione in response.
Symptoms to Watch For
- Persistent fatigue
- Memory problems and difficulty concentrating
- Mood changes including depression and anxiety
- Poor circulation
- Bone and joint pain
- Blurred vision
Who Should Get Tested?
- Anyone with a family history of heart disease or stroke
- People with suspected B12, B6, or folate deficiency
- Women planning pregnancy or experiencing recurrent miscarriage
- Vegans and vegetarians
- Individuals with MTHFR gene polymorphisms
- Older adults experiencing cognitive decline
How to Prepare for Your Test
No special preparation is needed for this test. On the day of the test, bring valid identification.
Order Your Blood Test
Test your Homocysteine levels with an accredited Swedish laboratory. Results within days, reviewed by Wellth.
Frequently Asked Questions
What is a healthy homocysteine level?
Can I lower my homocysteine with supplements?
Is homocysteine testing relevant during pregnancy?
Should I test homocysteine together with other markers?
Reviewed by
Wellth Team
Wellth
Our content is written and reviewed by Wellth, and fact-checked against peer-reviewed research and current Swedish clinical guidelines.
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The information on this page is provided for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment. Wellth provides health information and testing services but is not a substitute for clinical care. Always consult a qualified healthcare provider if you have questions about a medical condition. If you are experiencing severe or urgent symptoms, contact your doctor or call 1177 Vårdguiden. Blood test results should be interpreted by a qualified healthcare professional in the context of your complete medical history.