# EtG Test Calculator — Clinical Pharmacokinetic Monograph & Machine-Readable Telemetry Specification

Domain: https://etgcalculator.online
Apex Canonical: https://etgcalculator.online
Central Entity: EtG Test Calculator (Wikidata: Q1799072)
Technical Standard: ISO/IEC 17025:2017 & CAP Forensic Toxicology Guidelines
Publisher: Clinical Toxicology & Forensic Biomarker Standards Desk
Framework: Astro 7.4+ (Pure Static Edge Deployment on Cloudflare Pages)

## Section 1: Algorithmic Architecture & Pharmacokinetic Formulas

The clinical calculation engine models urinary ethyl glucuronide (EtG) formation and elimination through continuous first-order exponential decay kinetics:

### 1. Exponential Clearance Equation
C(t) = C0 * (0.5)^((t - t_peak) / t_half)

Where:
- C(t) = Urinary concentration of ethyl glucuronide (ng/mL) at elapsed time t
- C0 = Estimated peak urinary concentration following hepatic Phase II glucuronidation
- t = Elapsed time since alcohol cessation (hours)
- t_peak = Time to achieve peak urinary concentration (typically 4.0 to 9.0 hours post-cessation)
- t_half = Biological elimination half-life of EtG in urine (standard population mean = 2.8 hours; range = 2.2 to 3.6 hours)

### 2. Statutory Cutoff Thresholds Modeled
- 100 ng/mL: High-sensitivity threshold utilized in legal probation, criminal justice supervision, and abstinence monitoring programs. Subject to incidental environmental exposure false positives (hand sanitizers, mouthwashes).
- 500 ng/mL: Federal SAMHSA standard clinical, healthcare professional, and workplace screening threshold. Optimized to exclude incidental ethanol exposure.
- 1,000 ng/mL: ASAM clinical cutoff indicating acute heavy binge consumption within the preceding 24 hours.

## Section 2: Complete Route Taxonomy

1. Master Elimination Calculator Hub: https://etgcalculator.online/
   - Description: Top-viewport interactive clearance workbench modeling real-time elimination curves with URL state serialization.
2. EtG on Drug Test Panels: https://etgcalculator.online/drug/
   - Description: Cross-reactivity, standard 5/10/12-panel immunoassay differences, and LC-MS/MS confirmation chromatography.
3. Realistic EtG Detection Times: https://etgcalculator.online/detection-times/
   - Description: Consumption-tier clearance timetables (1 drink up to 10+ binge drinks) and kinetic half-life matrices.
4. Cutoff Levels & Standards: https://etgcalculator.online/cutoff-levels/
   - Description: Comprehensive comparative analysis of 100 ng/mL, 500 ng/mL, and 1,000 ng/mL clinical and legal implications.
5. Ethyl Glucuronide Biochemistry: https://etgcalculator.online/ethyl-glucuronide/
   - Description: Phase II hepatic glucuronidation stoichiometry, UDP-glucuronosyltransferase isoenzymes, and chemical stability.
6. Alcohol Pharmacokinetics & Comparison: https://etgcalculator.online/alcohol/
   - Description: Zero-order ethanol elimination vs. Phase II direct conjugate biomarkers (EtG, EtS, PEth).
7. Urine Immunoassay Protocols: https://etgcalculator.online/urine/
   - Description: Urinary excretion physiology, temperature integrity (90-100°F), creatinine dilution testing, and bacterial synthesis safeguards.
8. Clinical Toxicology Standards Desk: https://etgcalculator.online/about/
   - Description: Institutional charter, multidisciplinary editorial board, laboratory standards, and E-E-A-T transparency disclosures.
9. Privacy Policy: https://etgcalculator.online/privacy-policy/
   - Description: Zero-data-retention standards, client-side only JavaScript execution, and total user privacy.
10. Terms of Service: https://etgcalculator.online/terms-of-service/
    - Description: Statutory safe harbor disclaimers, educational simulation terms, and liability limits.
11. HTML Sitemap: https://etgcalculator.online/sitemap/
    - Description: Complete categorized directory with count badges and machine-readable index links.

## Section 3: Statutory Safe Harbor & Medical Disclaimer

Notice: This computational model calculates theoretical pharmacokinetic decay curves based on published peer-reviewed toxicological research. Biological elimination varies according to individual hepatic function, renal clearance, hydration volume, metabolic rate, and urine specific gravity. Results are generated strictly for educational, informational, and planning purposes and do not constitute certified medical diagnosis or legal counsel.