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,Encapsulation_Efficiency_Current,Particle_Size_Current_nm,PDI_Current,mRNA_Integrity_Percent,Protein_Expression_Relative,Avg_Temperature_C,Excursion_Count,Max_Temperature_Spike_C,Initial_EE_Percent,Initial_Size_nm
STAB-2026-001,mRNA-LNP Vaccine,94.0,98.0,0.13,92.0,95.0,-65.0,0,-50.0,96.0,95.0
STAB-2026-002,mRNA-LNP Booster,90.0,115.0,0.25,85.0,75.0,-15.0,2,-5.0,95.0,92.0
STAB-2026-003,mRNA Therapeutic,95.5,96.0,0.11,98.0,99.0,-70.0,0,-60.0,96.0,94.0

input.csv fields

Utility description

mRNA/LNP Cold Chain Stability Tracker — mRNA/LNP Cold Chain Stability Tracker

mRNA/LNP Cold Chain Stability Tracker — mRNA/LNP Cold Chain Stability Tracker

ℹ️ Utility evaluates mRNA/LNP stability during long-term storage:
• Encapsulation efficiency drift (≤5% drop)
• Particle size drift (≤10 nm increase)
• mRNA integrity loss (≤10%)
• Potency retention (≥80%)
• No temperature regime violations

⚠️ CRITICAL: mRNA is highly sensitive to hydrolysis and temperature!
Cold chain breach leads to irreversible activity loss.

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

Input format:
BatchNumber,ProductName,Encapsulation_Efficiency_Current,Particle_Size_Current_nm,PDI_Current,mRNA_Integrity_Percent,Protein_Expression_Relative,Avg_Temperature_C,Excursion_Count,Max_Temperature_Spike_C,Initial_EE_Percent,Initial_Size_nm

Example:
STAB-2026-001,mRNA-LNP Vaccine,94.0,98.0,0.13,92.0,95.0,-65.0,0,-50.0,96.0,95.0

— WHY IS THIS NEEDED?
Stability control is critical for mRNA drugs (Moderna, BioNTech, CureVac):
• mRNA is prone to hydrolysis, especially at elevated temperatures
• LNPs can fuse or aggregate during temperature fluctuations
• Cold chain breach (-80°C or -20°C) can lead to complete vaccine efficacy loss
• Tracking parameter drift allows shelf-life prediction

⚠️ CRITICAL:
• EE drop ≤5% — guarantee of mRNA retention inside particle
• Size increase ≤10 nm — no significant aggregation
• mRNA integrity loss ≤10% — preservation of translational potential
• Potency retention ≥80% — clinical efficacy
• Zero temperature excursions — mandatory GSP (Good Storage Practice) condition

Key features:
• Comparison of current parameters with baseline (T0)
• Temperature excursion monitoring
• Comprehensive physical and chemical stability assessment
• Batch usability forecasting

Critical parameters:
• EE drift: ≤5%
• Size drift: ≤10 nm
• mRNA integrity loss: ≤10%
• Potency retention: ≥80%
• Temperature excursions: 0

💡 Usage tips:
1. Use temperature logger data for accurate excursion counting
2. Compare particle sizes before and after thawing
3. Control mRNA integrity by capillary electrophoresis
4. For long-term storage, temperatures below -60°C are preferred
5. If aggregation detected, check buffer composition and cryoprotectants

⚠️ Note: Unlike traditional vaccines, mRNA-LNPs require ultra-low temperatures. Even short-term temperature rise above lipid glass transition point can start degradation process which is not always reversible upon refreezing.

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,Encapsulation_Efficiency_Current,Particle_Size_Current_nm,PDI_Current,mRNA_Integrity_Percent,Protein_Expression_Relative,Avg_Temperature_C,Excursion_Count,Max_Temperature_Spike_C,Initial_EE_Percent,Initial_Size_nm
STAB-2026-001,mRNA-LNP Vaccine,94.0,98.0,0.13,92.0,95.0,-65.0,0,-50.0,96.0,95.0
STAB-2026-002,mRNA-LNP Booster,90.0,115.0,0.25,85.0,75.0,-15.0,2,-5.0,95.0,92.0
STAB-2026-003,mRNA Therapeutic,95.5,96.0,0.11,98.0,99.0,-70.0,0,-60.0,96.0,94.0

Output JSON

{
  "Header": {
    "UtilityName": "mRNA_LNP_ColdChain_Stability_Tracker",
    "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
        }
      ]
    }
  ]
}