{
  "slug": "gulf-war-illness",
  "id": "gulf-war-illness-biomarkers",
  "condition": {
    "name": "Gulf War Illness",
    "shortName": "Gulf War Illness",
    "alternateNames": [
      "GWI",
      "Gulf War Syndrome",
      "Chronic Multisymptom Illness"
    ]
  },
  "page": {
    "title": "Gulf War Illness Biomarker Atlas | GWI / Gulf War Syndrome Markers",
    "breadcrumbName": "Gulf War Illness Biomarkers",
    "description": "Searchable atlas of Gulf War Illness (GWI) biomarkers — chronic inflammation, homocysteine, IFN-γ, autoantibodies, cholinergic dysfunction, and exposure-related markers vs healthy veterans, from peer-reviewed literature.",
    "keywords": [
      "Gulf War Illness biomarkers",
      "Gulf War Syndrome blood tests",
      "GWI inflammation",
      "homocysteine Gulf War",
      "chronic multisymptom illness veterans",
      "GWI inflammation markers",
      "Gulf War veterans health biomarkers",
      "pesticide exposure biomarkers GWI",
      "cholinergic autoantibodies GWI",
      "PON1 Gulf War Illness",
      "CRP Gulf War Syndrome",
      "biomarker atlas",
      "biomarker database",
      "peer-reviewed biomarkers",
      "chronic illness biomarkers"
    ],
    "canonical": "https://research.opensourcemed.info/gulf-war-illness-biomarkers.html",
    "hero": "Inflammatory, autoimmune, metabolic, cholinergic, and exposure-related biomarker alterations in Gulf War Illness (GWI / chronic multisymptom illness) compared to healthy deployed and non-deployed Gulf War veterans.",
    "dateModified": "2026-06-29"
  },
  "categories": {
    "inflammatory": "Inflammatory",
    "autoimmune": "Autoimmune",
    "exposure": "Exposure",
    "metabolic": "Metabolic",
    "neurological": "Neurological",
    "autonomic": "Autonomic",
    "ocular": "Ocular",
    "functional": "Functional"
  },
  "filters": [
    "inflammatory",
    "autoimmune",
    "exposure",
    "metabolic",
    "neurological",
    "autonomic",
    "ocular",
    "functional"
  ],
  "faq": [
    {
      "question": "Is there a validated diagnostic biomarker for Gulf War Illness?",
      "answer": "No. A 2021 systematic review found no single validated diagnostic biomarker for GWI. Chronic inflammation, homocysteine, IFN-γ, and cholinergic autoantibodies are recurring research findings."
    },
    {
      "question": "What exposures are linked to Gulf War Illness biomarker research?",
      "answer": "GWI research examines pesticide exposures, pyridostigmine bromide, oil well fire smoke, depleted uranium, and multiple vaccinations."
    }
  ],
  "markers": [
    {
      "name": "C-Reactive Protein (CRP)",
      "alternateName": "Acute phase protein",
      "direction": "up",
      "category": "inflammatory",
      "comparison": "HGV",
      "symptoms": "Chronic low-grade inflammation",
      "reference": {
        "citation": "Johnson et al. 2016",
        "doi": "10.1371/journal.pone.0157855"
      },
      "testType": "BloodTest",
      "loinc": "1988-5"
    },
    {
      "name": "Tumor Necrosis Factor-α (TNF-α)",
      "alternateName": "Pro-inflammatory cytokine",
      "direction": "up",
      "category": "inflammatory",
      "comparison": "HGV",
      "symptoms": "Fatigue, pain, inflammation",
      "reference": {
        "citation": "Johnson et al. 2016",
        "doi": "10.1371/journal.pone.0157855"
      },
      "testType": "BloodTest",
      "loinc": "3074-8"
    },
    {
      "name": "Interleukin-6 (IL-6)",
      "alternateName": "Pro-inflammatory cytokine",
      "direction": "up",
      "category": "inflammatory",
      "comparison": "HGV",
      "symptoms": "Systemic inflammation",
      "reference": {
        "citation": "Johnson et al. 2016",
        "doi": "10.1371/journal.pone.0157855"
      },
      "testType": "BloodTest",
      "loinc": "26881-5"
    },
    {
      "name": "Interleukin-1β (IL-1β)",
      "alternateName": "Pro-inflammatory cytokine",
      "direction": "up",
      "category": "inflammatory",
      "comparison": "HGV",
      "symptoms": "Pain, neuroinflammation",
      "reference": {
        "citation": "Johnson et al. 2016",
        "doi": "10.1371/journal.pone.0157855"
      },
      "testType": "BloodTest",
      "loinc": "26864-3"
    },
    {
      "name": "Interleukin-8 (IL-8 / CXCL8)",
      "alternateName": "Chemokine",
      "direction": "up",
      "category": "inflammatory",
      "comparison": "HGV",
      "symptoms": "Neutrophil activation",
      "reference": {
        "citation": "Johnson et al. 2016",
        "doi": "10.1371/journal.pone.0157855"
      },
      "testType": "BloodTest",
      "loinc": "26998-9"
    },
    {
      "name": "Neopterin",
      "alternateName": "Immune activation marker",
      "direction": "up",
      "category": "inflammatory",
      "comparison": "HGV",
      "symptoms": "Cell-mediated immune activation",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest",
      "loinc": "3254-0"
    },
    {
      "name": "sCD26 (soluble DPPIV)",
      "alternateName": "T cell activation marker",
      "direction": "mixed",
      "category": "inflammatory",
      "comparison": "HGV",
      "symptoms": "Immune dysregulation",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "sCD14",
      "alternateName": "Monocyte activation",
      "direction": "up",
      "category": "inflammatory",
      "comparison": "HGV",
      "symptoms": "Innate immune activation",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest",
      "loinc": "30180-5"
    },
    {
      "name": "Homocysteine",
      "alternateName": "Sulfur amino acid metabolite",
      "direction": "up",
      "category": "metabolic",
      "comparison": "HGV",
      "symptoms": "Vascular, cognitive dysfunction",
      "reference": {
        "citation": "Maury & Holton 2024",
        "doi": "10.1016/j.lfs.2024.122876"
      },
      "testType": "BloodTest",
      "loinc": "13965-9"
    },
    {
      "name": "Interferon-γ (IFN-γ)",
      "alternateName": "Th1 cytokine",
      "direction": "up",
      "category": "inflammatory",
      "comparison": "HGV",
      "symptoms": "Immune activation",
      "reference": {
        "citation": "Maury & Holton 2024",
        "doi": "10.1016/j.lfs.2024.122876"
      },
      "testType": "BloodTest",
      "loinc": "14477-8"
    },
    {
      "name": "Glutathione (GSH)",
      "alternateName": "Antioxidant tripeptide",
      "direction": "down",
      "category": "metabolic",
      "comparison": "HGV",
      "symptoms": "Oxidative stress",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "GSH:GSSG ratio",
      "alternateName": "Redox balance",
      "direction": "down",
      "category": "metabolic",
      "comparison": "HGV",
      "symptoms": "Oxidative damage",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "8-isoprostane",
      "alternateName": "Lipid peroxidation marker",
      "direction": "up",
      "category": "metabolic",
      "comparison": "HGV",
      "symptoms": "Oxidative stress",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "Coenzyme Q10",
      "alternateName": "Mitochondrial cofactor",
      "direction": "down",
      "category": "metabolic",
      "comparison": "HGV",
      "symptoms": "Fatigue, mitochondrial dysfunction",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "PON1 (paraoxonase 1) activity",
      "alternateName": "OP pesticide detoxification",
      "direction": "down",
      "category": "exposure",
      "comparison": "HGV",
      "symptoms": "Organophosphate sensitivity",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "PON1 Q192R polymorphism",
      "alternateName": "Genetic exposure susceptibility",
      "direction": "mixed",
      "category": "exposure",
      "comparison": "Genotype-stratified",
      "symptoms": "Pesticide exposure response",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "Butyrylcholinesterase (BChE)",
      "alternateName": "Cholinesterase",
      "direction": "mixed",
      "category": "exposure",
      "comparison": "HGV",
      "symptoms": "Cholinergic dysfunction",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "Acetylcholinesterase (AChE)",
      "alternateName": "Cholinesterase",
      "direction": "mixed",
      "category": "exposure",
      "comparison": "HGV",
      "symptoms": "PB/pesticide exposure sequelae",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "Anti-acetylcholine receptor antibodies",
      "alternateName": "Cholinergic autoantibodies",
      "direction": "up",
      "category": "autoimmune",
      "comparison": "HGV",
      "symptoms": "Muscle weakness, autonomic symptoms",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "Anti-nuclear antibodies (ANA)",
      "alternateName": "Autoimmune screen",
      "direction": "mixed",
      "category": "autoimmune",
      "comparison": "HGV",
      "symptoms": "Autoimmune overlap subset",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "Rheumatoid factor (RF)",
      "alternateName": "Autoimmune marker",
      "direction": "mixed",
      "category": "autoimmune",
      "comparison": "HGV",
      "symptoms": "Joint pain subset",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "DNA adducts (pesticide-related)",
      "alternateName": "Genotoxic exposure marker",
      "direction": "up",
      "category": "exposure",
      "comparison": "HGV",
      "symptoms": "Chemical exposure sequelae",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "Depleted uranium (urinary)",
      "alternateName": "Toxic exposure biomarker",
      "direction": "mixed",
      "category": "exposure",
      "comparison": "HGV",
      "symptoms": "Exposure subset — research",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "PathologyTest"
    },
    {
      "name": "Sarin/cyclosarin exposure markers",
      "alternateName": "Nerve agent metabolites",
      "direction": "mixed",
      "category": "exposure",
      "comparison": "HGV",
      "symptoms": "Khamisiyah exposure cohort",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "Heart rate variability (HRV)",
      "alternateName": "Autonomic function",
      "direction": "down",
      "category": "autonomic",
      "comparison": "HGV",
      "symptoms": "Dysautonomia, orthostatic intolerance",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "MedicalTest"
    },
    {
      "name": "Orthostatic heart rate increment",
      "alternateName": "Tilt table / stand test",
      "direction": "up",
      "category": "autonomic",
      "comparison": "HGV",
      "symptoms": "POTS-like phenotype",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "MedicalTest"
    },
    {
      "name": "Contrast sensitivity",
      "alternateName": "Ocular function test",
      "direction": "down",
      "category": "ocular",
      "comparison": "HGV",
      "symptoms": "Visual disturbance",
      "reference": {
        "citation": "Baksh et al. 2021",
        "doi": "10.1093/milmed/usab024"
      },
      "testType": "MedicalTest"
    },
    {
      "name": "Macular pigment optical density",
      "alternateName": "Retinal carotenoid measure",
      "direction": "down",
      "category": "ocular",
      "comparison": "HGV",
      "symptoms": "Ocular GWI phenotype",
      "reference": {
        "citation": "Baksh et al. 2021",
        "doi": "10.1093/milmed/usab024"
      },
      "testType": "MedicalTest"
    },
    {
      "name": "Laser-induced blood spectra (LIBS)",
      "alternateName": "Elemental fingerprint",
      "direction": "mixed",
      "category": "functional",
      "comparison": "HGV",
      "symptoms": "Discriminant GWI signature",
      "reference": {
        "citation": "Gaudiuso et al. 2022",
        "doi": "10.1038/s41598-022-18807-5"
      },
      "testType": "MedicalTest"
    },
    {
      "name": "Cortisol (diurnal)",
      "alternateName": "HPA axis hormone",
      "direction": "mixed",
      "category": "neurological",
      "comparison": "HGV",
      "symptoms": "Fatigue, stress response",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest",
      "loinc": "2143-6"
    },
    {
      "name": "DHEA / DHEA-S",
      "alternateName": "Adrenal androgen",
      "direction": "mixed",
      "category": "neurological",
      "comparison": "HGV",
      "symptoms": "HPA axis dysregulation",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "Brain-derived neurotrophic factor (BDNF)",
      "alternateName": "Neurotrophin",
      "direction": "mixed",
      "category": "neurological",
      "comparison": "HGV",
      "symptoms": "Cognitive dysfunction",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "S100B",
      "alternateName": "Astrocyte protein",
      "direction": "mixed",
      "category": "neurological",
      "comparison": "HGV",
      "symptoms": "Neurological symptoms subset",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "β2-adrenergic receptor autoantibodies",
      "alternateName": "GPCR autoAbs — ME/CFS overlap",
      "direction": "up",
      "category": "autoimmune",
      "comparison": "HGV",
      "symptoms": "Dysautonomia",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "Muscarinic receptor autoantibodies",
      "alternateName": "Cholinergic autoAbs",
      "direction": "up",
      "category": "autoimmune",
      "comparison": "HGV",
      "symptoms": "Autonomic, GI symptoms",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "Acylcarnitines",
      "alternateName": "Fatty acid oxidation — ME/CFS overlap",
      "direction": "up",
      "category": "metabolic",
      "comparison": "HGV",
      "symptoms": "Fatigue, mitochondrial dysfunction",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest"
    },
    {
      "name": "Lactate",
      "alternateName": "Anaerobic metabolite",
      "direction": "up",
      "category": "metabolic",
      "comparison": "HGV",
      "symptoms": "Exercise intolerance",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest",
      "loinc": "2524-7"
    },
    {
      "name": "Vitamin D (25-OH)",
      "alternateName": "Calcidiol",
      "direction": "mixed",
      "category": "metabolic",
      "comparison": "HGV",
      "symptoms": "Immune modulation",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "BloodTest",
      "loinc": "1989-3"
    },
    {
      "name": "6-minute walk distance",
      "alternateName": "Functional capacity",
      "direction": "down",
      "category": "functional",
      "comparison": "HGV",
      "symptoms": "Physical limitation",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "MedicalTest"
    },
    {
      "name": "SF-36 physical component score",
      "alternateName": "Quality of life",
      "direction": "down",
      "category": "functional",
      "comparison": "HGV",
      "symptoms": "Disability, activity limitation",
      "reference": {
        "citation": "Gean et al. 2021",
        "doi": "10.1016/j.lfs.2021.119456"
      },
      "testType": "MedicalTest"
    },
    {
      "name": "H3K9Ac (chromatin marker)",
      "alternateName": "Epigenetic inflammation control",
      "direction": "mixed",
      "category": "inflammatory",
      "comparison": "HGV",
      "symptoms": "Inflammatory gene regulation",
      "reference": {
        "citation": "Johnson et al. 2016",
        "doi": "10.1371/journal.pone.0157855"
      },
      "testType": "BloodTest"
    }
  ]
}