{
  "name": "Dietary biomarker classes used to evaluate self-reported intake",
  "description": "Compares recovery and concentration biomarkers named in the NCI Dietary Assessment Primer by dietary component and whether each can be used to measure absolute intake or assess error in self-report. Compiled from the primer's biomarker page.",
  "page": "https://casrai.org/guides/nutritional-epidemiology",
  "publisher": "CASRAI",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "dateModified": "2026-11-12T13:58:41Z",
  "temporalCoverage": null,
  "spatialCoverage": null,
  "columns": [
    {
      "name": "Biomarker",
      "unit": "",
      "description": ""
    },
    {
      "name": "Class",
      "unit": "",
      "description": ""
    },
    {
      "name": "Dietary component",
      "unit": "",
      "description": ""
    },
    {
      "name": "Measures absolute intake",
      "unit": "",
      "description": ""
    },
    {
      "name": "Usable to assess self-report error",
      "unit": "",
      "description": ""
    }
  ],
  "rows": [
    {
      "Biomarker": "Doubly labeled water",
      "Class": "Recovery",
      "Dietary component": "Energy (in weight-stable people)",
      "Measures absolute intake": "Yes",
      "Usable to assess self-report error": "Yes"
    },
    {
      "Biomarker": "24-hour urinary nitrogen",
      "Class": "Recovery",
      "Dietary component": "Nitrogen",
      "Measures absolute intake": "Yes",
      "Usable to assess self-report error": "Yes"
    },
    {
      "Biomarker": "24-hour urinary sodium",
      "Class": "Recovery",
      "Dietary component": "Sodium",
      "Measures absolute intake": "Yes",
      "Usable to assess self-report error": "Yes"
    },
    {
      "Biomarker": "24-hour urinary potassium",
      "Class": "Recovery",
      "Dietary component": "Potassium",
      "Measures absolute intake": "Yes",
      "Usable to assess self-report error": "Yes"
    },
    {
      "Biomarker": "Concentration biomarkers (general)",
      "Class": "Concentration",
      "Dietary component": "Varies by biomarker",
      "Measures absolute intake": "No",
      "Usable to assess self-report error": "No"
    }
  ],
  "sources": [
    {
      "title": "NCI Dietary Assessment Primer: Biomarkers",
      "url": "https://epi.grants.cancer.gov/dietary-assessment-primer/learn/biomarkers.html",
      "accessed": "2026-11-12"
    }
  ]
}