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homocysteine
Pathway / Endothelial activation & erosion

homocysteine

metabolite

Elevated homocysteine impairs endothelial function and promotes oxidative modification of LDL, accelerating atherosclerotic lipid retention and plaque vulnerability.

Pathway placement
Cascade stepEndothelial activation & erosion
Confidencemedium
RationaleEndothelial dysfunction marker; homocysteinylated LDL enhances atherogenic lipid accumulation.
Also acts inLipid entry/oxidation, Platelet activation, Systemic / off-pathway, Vascular inflammation
Druggability
Not assessed (no mapped human gene target).

Type I vs Type II discrimination

ScoresType-II-associated
R — rupture / Type-I
—
C — confounder / Type-II
61
A — assay feasibility
84
E — evidence strength
61
T1DI (composite)
14
Specificity differential (R−C)-46
Confounder panel (Type-II drivers)
1sepsis / systemic inflammationmag 2
2anemia / acute blood lossmag 2
3hypovolemia / dehydrationmag 1
4tachyarrhythmiamag 2
5hypoxemia / respiratory failuren/a
6hypertensive emergencymag 2
7high-demand / peri-operative stressmag 2
Coverage: 6/7 confounders with evidence
Tier: deep-scored (abstract-extracted) · 15 supporting references. See the discrimination table for all markers.

Assay & specimen

Validated clinical assay
Specimen
Plasma (EDTA, chilled, separate promptly) or serum
Collection tube
K2-EDTA, chilled plastic (lavender-top) · Serum separator (gold/red-top, SST)
Method / principle
Immunoassay (enzymatic conversion) or LC-MS/MS
Reagent / substrate
SAH hydrolase-coupled enzymatic cycling; or isotope-labeled IS for MS
Platform
Automated analyzer / LC-MS/MS
Turnaround · availability
Routine–send-out · Widely available

Literature evidence(17)