Fluorine18FESQualityChecker

URS & FS — User Requirements and Functional Specification

This document describes the controlled interface and behaviour of Fluorine18FESQualityChecker for Fluorine-18 FES.

Domain limits and critical parameters

• ℹ️ Utility checks critical parameters of [18F]Fluoroestradiol (FES):
• • Radionuclidic purity (≥99.9%)
• • Radiochemical purity (≥95%)
• • Free Fluoride-18 impurity (≤5.0%)
• • Precursor/Cold FES impurity (≤2.0%)
• • Specific activity (≥100 GBq/μmol) — CRITICAL!
• • Residual solvents (ethanol), pH, endotoxins, sterility
• ⚠️ CRITICAL: Specific activity <100 GBq/μmol → RECEPTOR SATURATION!
• BatchNumber,RadionuclidicPurityPercent,RadiochemicalPurityPercent,FreeFluoridePercent,PrecursorImpurityPercent,pH,EndotoxinsEU,SterilityTest,HeavyMetalsPPM,ResidualEthanolPercent,SpecificActivityGBqPerUmol
• Example (sterility: 0=sterile, 1=contaminated):
• ⚠️ CRITICAL:
• • Specific activity ≥100 GBq/μmol (often >200 GBq/μmol required) — this is the strictest parameter for FES. Even microgram amounts of cold estradiol can occupy a significant fraction of receptors.
• • Radiochemical purity ≥95% — ensures specific binding
• • Free Fluoride ≤5.0% — bone accumulation can interfere with bone metastasis assessment

URS — User Requirements Specification

input.csv contract

BatchNumber,RadionuclidicPurityPercent,RadiochemicalPurityPercent,FreeFluoridePercent,PrecursorImpurityPercent,pH,EndotoxinsEU,SterilityTest,HeavyMetalsPPM,ResidualEthanolPercent,SpecificActivityGBqPerUmol
F18-FES-2026-001,99.99,98.5,1.0,0.2,7.0,25.0,0,1,5.0,250.0
F18-FES-2026-002,99.95,94.0,6.5,1.0,6.8,100.0,0,5,8.0,80.0
F18-FES-2026-003,99.98,99.0,0.5,0.1,7.2,10.0,0,1,2.0,350.0

FS — Functional Specification

Example output.json

{
  "utilityId": "fluorine18-fes-quality-checker",
  "api": "Fluorine-18 FES",
  "overallStatus": "PASS|WARNING|FAIL",
  "sourceFile": "input.csv",
  "checks": [
    {
      "parameter": "BatchNumber",
      "value": "F18-FES-2026-001",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "RadionuclidicPurityPercent",
      "value": "99.99",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "RadiochemicalPurityPercent",
      "value": "98.5",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "FreeFluoridePercent",
      "value": "1.0",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "PrecursorImpurityPercent",
      "value": "0.2",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "pH",
      "value": "7.0",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "EndotoxinsEU",
      "value": "25.0",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "SterilityTest",
      "value": "0",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    }
  ],
  "criticalFindings": []
}

OQ/PQ test scenarios

QA/QC and change control

• Do not rename columns without updating the validator and test set.
• Retain input.csv, output.json, executable version and checksum.
• Before production use, perform IQ/OQ/PQ or equivalent CSV/CSA verification.
• Critical radiopharmaceutical limits must be verified against the approved specification and local SOPs.