Purpose

Define user requirements for a standalone FUZKK utility that accepts laboratory CSV data, evaluates the records using limits embedded in code, and produces LabWare-compatible JSON.

Scope

The utility is intended for preliminary QC/QA review, integration testing, LIMS/LabWare flow and evidence-trail preparation. Final release decisions remain under the laboratory's validated procedure and responsible personnel.

Users

QC analyst, QA reviewer, CSV/validation engineer, LIMS/LabWare integration engineer, responsible laboratory specialist.

User requirements

1. The utility shall run without arguments and print its self-description, a built-in input.csv example from GetDemoData(), and demo evaluation for the embedded records.
2. The utility shall run with two arguments: input.csv output.json.
3. The utility shall not read input.csv and shall not write output.json when started without arguments.
4. CSV numeric values shall be parsed using CultureInfo.InvariantCulture.
5. Output shall be generated as LabWare-compatible JSON with Header, Samples, Results, Status, StatusCode, ErrorMessage, Description and DescriptionEN.
6. For PASS records, ErrorMessage shall be an empty string.
7. Embedded limits shall follow this priority: Ph. Eur. → British Pharmacopoeia / UK implementation → EAEU / regional requirements → EMA/ICH/EU guidance → USP fallback.
8. If an exact monograph is not known, strict standard API limits are used where applicable: assay 98–102%, total impurities ≤1.0%, individual impurity ≤0.5%.
9. For biologics and mAb-like products, aggregation, sterility and endotoxin checks shall be included where relevant to the utility purpose.
10. If a parameter may arrive in different units, the unit shall be represented as a separate input field or explicitly reflected in the input.csv field name.

Input CSV

BatchNumber,ProductName,Endotoxin_EU_ml,MaxDose_ml,K_Value,PatientWeight_kg,SterilityTest_Method,Growth_FTM,Growth_TSB,Incubation_Days,Bioburden_CFU_unit
EYE-SE-2026-001,Aflibercept Intravitreal,0.8,0.05,5.0,70.0,MembraneFiltration,NoGrowth,NoGrowth,14,2.0
EYE-SE-2026-002,Ranibizumab Solution,0.2,0.05,5.0,70.0,DirectInoculation,NoGrowth,NoGrowth,14,1.0
EYE-SE-2026-003,Faricimab IVT,15.0,0.05,5.0,70.0,MembraneFiltration,NoGrowth,NoGrowth,14,5.0

input.csv fields

Utility description

Ophthalmic Sterility & Endotoxin UltraChecker — Ultra-control of sterility and endotoxins for ophthalmology

Ophthalmic Sterility & Endotoxin UltraChecker — Ultra-control of sterility and endotoxins for ophthalmology

ℹ️ Utility checks microbiological safety of ophthalmic products:
• Endotoxins (strictly <0.5 EU/dose)
• Sterility (FTM/TSB, 14 days)
• Bioburden (pre-sterilization)

⚠️ CRITICAL: Intravitreal injection carries risk of blindness if contaminated!
Endotoxins cause severe intraocular inflammation.

Usage:
OphthalmicSterilityEndotoxinUltraChecker.exe → demo mode (console output)
OphthalmicSterilityEndotoxinUltraChecker.exe input.csv output.json → evaluate your data

Input format:
BatchNumber,ProductName,Endotoxin_EU_ml,MaxDose_ml,K_Value,PatientWeight_kg,SterilityTest_Method,Growth_FTM,Growth_TSB,Incubation_Days,Bioburden_CFU_unit

Example:
EYE-SE-2026-001,Aflibercept Intravitreal,0.8,0.05,5.0,70.0,MembraneFiltration,NoGrowth,NoGrowth,14,2.0

— WHY IS THIS NEEDED?
Microbiological control is critical for intravitreal drugs (Roche, Novartis, Kanghong):
• Eye lacks effective immune protection against bacteria compared to other organs
• Infection (endophthalmitis) can lead to irreversible vision loss within 24-48 hours
• Endotoxins (Gram-negative bacterial lipopolysaccharides) cause sterile inflammation, edema, and pain
• Small dose volume (0.05 mL) means even low endotoxin concentration gives significant load to eye

⚠️ CRITICAL:
• Endotoxins <0.5 EU per dose (internal strict standard, though USP allows more)
• Sterility: Absolute no growth in FTM and TSB media
• Incubation: Minimum 14 days for slow-growing organisms
• Bioburden: Must be minimal (<10 CFU) before final filtration
• LAL Method: Must be validated for absence of interference with product

Key features:
• Endotoxin limit calculation considering small dose
• Dual sterility control (FTM + TSB)
• Bioburden monitoring as sterilization quality predictor
• Strict internal limits for ophthalmology

Critical parameters:
• Endotoxins: <0.5 EU/dose
• Sterility: Negative (No Growth)
• Bioburden: ≤10 CFU/unit

💡 Usage tips:
1. Use membrane filtration method for large volumes if possible
2. Perform interference test (Negative Product Control) for each new product
3. Control Water for Injection (WFI) quality as main endotoxin source
4. If sterility positive, immediately start investigation (OOS)
5. For biopharmaceuticals, account for potential LAL reaction inhibition by protein itself

⚠️ Note: In ophthalmology, concept of "pyrogenicity" is replaced by "inflammatory potential". Even dead bacterial remnants (endotoxins) can cause destructive reaction in vitreous humor. The utility applies ultra-strict limits exceeding general pharmacopoeial requirements for parenterals.

Traceability and limitations

• The URS is used as the source document for functional specification, CSV review and later validation work.
• This document does not replace an approved pharmacopoeial monograph, validated analytical method or internal product specification.
• For product-specific limits, the approved customer specification takes priority.

The functional specification describes the behaviour of the standalone FUZKK console utility, input-data format, evaluation algorithm and output JSON structure.

Functional flow

1. Main() checks the number of arguments.
2. If no arguments are provided: PrintHello() prints the description and built-in input.csv example, then RunDemoEvaluation() executes Evaluate() over GetDemoData() and prints demo JSON.
3. If two arguments are provided: RunWithFiles(input.csv, output.json) reads CSV, evaluates each record and writes LabWare-compatible JSON.
4. LoadData() uses CultureInfo.InvariantCulture and shall not be called in no-arguments mode.
5. Evaluate() returns a named tuple with BatchNumber, ProductName, Parameters, CriticalFailCount, WarningCount, Recommendation and RecommendationEN.
6. GetIssues() builds messages for ErrorMessage in WARNING/FAIL cases.

Evaluation rules

• PASS: CriticalFailCount = 0 and WarningCount = 0.
• WARNING: CriticalFailCount = 0 and WarningCount > 0.
• FAIL: CriticalFailCount > 0.
• ERROR: exception during reading or processing.
• ErrorMessage remains empty for PASS.
• Limits are embedded in Program.cs; no external limit configuration is required.

Input and fields

BatchNumber,ProductName,Endotoxin_EU_ml,MaxDose_ml,K_Value,PatientWeight_kg,SterilityTest_Method,Growth_FTM,Growth_TSB,Incubation_Days,Bioburden_CFU_unit
EYE-SE-2026-001,Aflibercept Intravitreal,0.8,0.05,5.0,70.0,MembraneFiltration,NoGrowth,NoGrowth,14,2.0
EYE-SE-2026-002,Ranibizumab Solution,0.2,0.05,5.0,70.0,DirectInoculation,NoGrowth,NoGrowth,14,1.0
EYE-SE-2026-003,Faricimab IVT,15.0,0.05,5.0,70.0,MembraneFiltration,NoGrowth,NoGrowth,14,5.0

Output JSON

{
  "Header": {
    "UtilityName": "Ophthalmic_Sterility_Endotoxin_UltraChecker",
    "Version": "1.0.0",
    "Timestamp": "UTC",
    "InstrumentID": "FUZKK-QC-WORKSTATION",
    "OperatorID": "Admin"
  },
  "Samples": [
    {
      "SampleID": "from BatchNumber",
      "BatchNumber": "from CSV",
      "ProductName": "from CSV",
      "TestName": "utility-specific test",
      "AnalysisCode": "utility-specific code",
      "Status": "PASS | WARNING | FAIL | ERROR",
      "StatusCode": "1 | 2 | 0 | -1",
      "ErrorMessage": "",
      "Description": "Russian recommendation",
      "DescriptionEN": "English recommendation",
      "Results": [
        {
          "ParameterName": "parameter",
          "ResultValue": 0.0,
          "UnitOfMeasure": "unit",
          "SpecificationLimit": "limit",
          "IsWithinSpec": true
        }
      ]
    }
  ]
}