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Blutwerte · Marker

Homocystein

Homocysteine · Hcy · tHcy

Entzündungsmarker
Einheit:
μmol/L
Abbreviation
Hcy

Homocysteine measures the concentration of this amino acid in the blood, reflecting methionine metabolism and methylation cycle efficiency.

Reference Ranges

Reference
515μmol/L
5
10
15
LowNormalHigh
Reference
Optimal
Unit · μmol/L

Standard ranges apply to adults; slight variations may exist based on laboratory standards.

Overview

Übersicht

Homocysteine (Hcy) is a sulfur-containing amino acid derived from methionine metabolism. It is not incorporated into proteins but serves as an intermediate in the methylation cycle, where it can be remethylated to methionine or converted to cysteine. Elevated levels of homocysteine, known as hyperhomocysteinemia, are associated with a wide range of pathological conditions. Researchers have observed that high plasma homocysteine levels are linked to cardiovascular diseases, neurodegenerative disorders, and other age-related conditions. Clinically, elevated homocysteine is a risk marker for atherosclerosis, stroke, and cognitive impairments, including Alzheimer's disease. It is also implicated in developmental issues such as neural tube defects. For athletes and biohackers, maintaining optimal homocysteine levels is crucial as it may influence cardiovascular health and cognitive function, potentially impacting performance and longevity. Researchers found that interventions such as B vitamin supplementation can reduce homocysteine levels, potentially mitigating associated risks. However, factors such as genetic predispositions, dietary habits, and lifestyle choices can affect homocysteine levels. Time-of-day and fasting status may not significantly influence homocysteine measurements, but certain medications and health conditions can interfere with results. Therefore, understanding and managing these factors is essential for accurate assessment and intervention.

Klinische Bedeutung

Elevated homocysteine levels indicate increased risk for cardiovascular diseases, cognitive impairments, and neurodegenerative disorders. Low levels are less commonly discussed but may reflect nutritional deficiencies.

Dynamics

Trend Interpretation

Rising Values

Progressively rising homocysteine levels suggest increasing risk for cardiovascular and neurodegenerative diseases. Retest in 4 weeks if levels exceed 15 μmol/L.

Falling Values

Falling levels indicate effective intervention or improved nutritional status.

Re-test Interval

4 weeks if outside optimal range

Etiology

Causes — High & Low

Cause

Elevated Levels

  • Vitamin B6, B9, B12 deficiency
  • Genetic defects
  • Smoking and alcohol consumption
  • Diabetes
  • Hypothyroidism
Cause

Low Levels

  • High intake of B vitamins
  • Genetic factors
  • Certain medications
  • Malabsorption syndromes
Protocol

How to Optimize

Lever

Lifestyle

  • Quit smoking
  • Reduce alcohol consumption
  • Manage diabetes
  • Exercise regularly
Lever

Nutrition

  • Increase intake of leafy greens
  • Consume fortified cereals
  • Include fish in diet
  • Eat legumes
Lever

Supplementation

  • Folic acid
  • Vitamin B6
  • Vitamin B12

Note:

Consult a healthcare provider before starting any supplementation, especially if you have underlying health conditions.

Testing Guidelines

Fasting Not Required
Not Time-Sensitive

Draw blood at the same time of day for consistency, as levels may fluctuate.

Testing Frequency

Annually for adults at risk of cardiovascular or cognitive diseases.

Interfering Factors

  • Certain medications
  • Renal impairment
  • Recent dietary changes

Related Peptides & Hormones

Methylmalonic Acid

Correlated with

hormone or peptide

Open Research Questions

Current research suggests that the optimal target levels for homocysteine remain debated, particularly regarding the threshold for intervention and the influence of confounders such as vitamin B12 status and genetic factors. Researchers have not yet established definitive reference ranges for homocysteine in various populations, including those with comorbidities. Additionally, clinical questions remain unanswered regarding the long-term effects of lowering homocysteine on cognitive decline and cardiovascular outcomes in diverse patient groups.

28 Research Publications

1,053

Total Citations

5

Human/RCT

4.6

Avg. Influence

2025

Latest

Sort
Filter
#01

Cysteine and homocysteine as biomarker of various diseases.

ReviewInfluence5.0
258
This review highlighted the link between homocysteine and various diseases, emphasizing that elevated levels of homocysteine are toxic and associated with health issues like cardiovascular diseases and neurological disorders. Researchers concluded that monitoring homocysteine levels could aid in disease prevention and diagnosis.
View on PubMed
#02

Homocysteine - from disease biomarker to disease prevention.

ReviewInfluence14.0
214
Researchers reviewed over 100 diseases associated with high levels of homocysteine, particularly cardiovascular and central nervous system diseases. They found that lowering homocysteine levels through B vitamin treatment could potentially prevent conditions like neural tube defects and cognitive impairment. Values of 10 μmol/L or below are likely safe, while levels above 11 μmol/L may require intervention.
View on PubMed
#03

Potential Biomarkers for Post-Stroke Cognitive Impairment: A Systematic Review and Meta-Analysis.

Meta-AnalysisInfluence6.0
111
This study evaluated various blood biomarkers for post-stroke cognitive impairment, including homocysteine. Researchers found that homocysteine levels were significantly higher in patients with cognitive impairment after stroke compared to those without. The study suggests homocysteine as a potential biomarker for assessing cognitive outcomes in stroke patients.
View on PubMed
#04

Homocysteine metabolism in diabetes.

HumanInfluence5.0
105
Researchers studied homocysteine metabolism in diabetes and found that plasma homocysteine levels were lower in both Type 1 and Type 2 diabetes patients compared to controls. They attributed this reduction to increased activity of specific enzymes involved in homocysteine catabolism.
View on PubMed
#05

Homocysteine as a Pathological Biomarker for Bone Disease.

Review
80
This study reviewed the role of homocysteine (Hcy) as a pathological biomarker for bone disease. Researchers found that elevated Hcy levels could contribute to osteoporosis and bone loss through oxidative stress, highlighting the need for further investigation into its effects on bone health.
View on PubMed
#06

Pseudoexfoliation Syndrome.

ReviewInfluence4.0
56
Researchers found that pseudoexfoliation syndrome is associated with elevated homocysteine levels and various systemic diseases, particularly affecting the cardiovascular and central nervous systems. The study underscores the clinical significance of monitoring homocysteine in patients with this syndrome. Elevated homocysteine may indicate underlying health issues.
View on PubMed
#07

Caspase-3-Responsive Fluorescent/Photoacoustic Imaging of Tumor Apoptosis.

Human
50
This study focused on developing a tumor-targeted probe for imaging apoptosis, specifically targeting caspase-3 activity. While not directly related to homocysteine, it highlights advancements in biomarker research for cancer diagnostics. The probe demonstrated enhanced imaging capabilities in tumor cells.
View on PubMed
#08

Clinical significance of homocysteine (hcy) on dementia in Parkinson's disease (PD).

UnknownInfluence2.0
36
Researchers assessed the significance of elevated homocysteine (Hcy) levels in Parkinson's disease (PD) patients with dementia. The study found that Hcy levels were higher in PD patients with dementia compared to those without, indicating a potential link to cognitive decline.
View on PubMed
#09

Elevated Serum Homocysteine (Hcy) Levels May Contribute to the Pathogenesis of Cerebral Infarction.

Meta-Analysis
27
Researchers performed a meta-analysis to investigate the correlation between serum homocysteine levels and cerebral infarction (CI). They found that CI patients had significantly higher serum homocysteine levels compared to healthy controls, indicating a strong association. The study suggests that monitoring homocysteine levels could be important for early diagnosis and treatment assessment of CI.
View on PubMed
#10

Biomarker characterization of clinical subtypes of Parkinson Disease.

UnknownInfluence2.0
24
Researchers characterized clinical subtypes of Parkinson's disease (PD) and found significant differences in serum homocysteine (Hcy) levels among the identified subtypes. The study suggests that Hcy could be a useful biomarker for stratifying PD severity.
View on PubMed

Publication Trend

Research publications about Homocystein over time

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