NorelgestrominEthinylestradiolPatchQualityChecker

Norelgestromin Ethinylestradiol Patch

assay biologics contraceptives fixed-dose combinations heavy metals hormones impurities microbiology

Norelgestromin + Ethinylestradiol Patch Quality Checker — Transdermal Patch (Evra) (Ph. Eur., USP <17>)

ℹ️  The utility checks active substance content (per patch), transdermal release rate (mcg/24h), physical properties (area, thickness, adhesion), impurities, microbiology, packaging integrity.
ℹ️  Does not use machine learning — rule-based logic only.
⚠️  CRITICAL for transdermal systems! Release rate is key efficacy parameter. Adhesion ≥1.0 N — prevents patch detachment! Microbiology important for skin contact.

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

Input format:
BatchNumber,NorelgestrominContent,EthinylestradiolContent,NorelgestrominReleaseRate,EthinylestradiolReleaseRate,PatchArea,PatchThickness,AdhesionForce,ImpurityNorel3Keto,ImpurityNorelEpimer,ImpurityEE17Epi,TotalImpurities,HeavyMetals,TAMC,TYMC,EColiDetected,SalmonellaDetected,PackagingIntegrityTest,EthanolPPM,AcetonePPM

Example (pathogens and packaging integrity: 0=pass, 1=fail):
PATCH-2026-001,6.3,0.60,175.0,25.0,20.0,0.75,1.5,0.2,0.1,0.15,0.45,10,500,50,0,0,0,800,500

— WHY IS THIS NEEDED?
Transdermal patch (norelgestromin + ethinylestradiol) — modern contraceptive form:
• Evra — applied to skin once weekly, 3 weeks use + 1 week break
• Provides constant hormone delivery through skin, avoiding first-pass liver metabolism
• User convenience (no daily pill intake required)
⚠️ CRITICAL:
• Norelgestromin release rate 150–200 mcg/24h — ensures contraceptive efficacy
• EE release rate 20–30 mcg/24h — minimizes systemic estrogenic effects
• Adhesion ≥1.0 N — critical! Patch must stay securely on skin during movement, bathing, sweating
• Patch area 20 cm² (±10%) — affects release rate
• Absence of pathogens (E. coli, Salmonella) — important for skin contact, especially with possible microtraumas
⚠️ Special attention: Transdermal systems have UNIQUE requirements! Release rate tested by Franz cell method (through artificial membrane simulating skin). Adhesion tested on standard surface (glass, skin) with peel force measurement. Patch must maintain adhesion for 7 days under normal use conditions.
Critical parameters:
• Norelgestromin content: 6.0–6.6 mg/patch (6.3 ± 5%)
• Ethinylestradiol content: 0.55–0.65 mg/patch (0.6 ± 8.3%)
• Norelgestromin release rate: 150–200 mcg/24h
• EE release rate: 20–30 mcg/24h
• Patch area: 18–22 cm²
• Patch thickness: 0.5–1.0 mm
• Adhesion: ≥1.0 N (peel force)
• Norelgestromin 3-keto: ≤0.5%
• Norelgestromin epimer: ≤0.5%
• Ethinylestradiol 17-epimer: ≤0.5%
• Total impurities: ≤1.0%
• Heavy metals: ≤20 ppm
• TAMC: ≤1000 CFU/g
• TYMC: ≤100 CFU/g
• Absence of E. coli and Salmonella
• Packaging integrity: no compromise
• Residual solvents: ethanol ≤5000 ppm, acetone ≤5000 ppm
⚠️ Note: Patch consists of multiple layers (drug reservoir, adhesive layer, release liner). Release rate control is critical — determines dose delivered to body! Adhesion tested for compliance with extended wear requirements (7 days). Microbiological control important to prevent skin irritation.

input.csv

BatchNumber,NorelgestrominContent,EthinylestradiolContent,NorelgestrominReleaseRate,EthinylestradiolReleaseRate,PatchArea,PatchThickness,AdhesionForce,ImpurityNorel3Keto,ImpurityNorelEpimer,ImpurityEE17Epi,TotalImpurities,HeavyMetals,TAMC,TYMC,EColiDetected,SalmonellaDetected,PackagingIntegrityTest,EthanolPPM,AcetonePPM
PATCH-2026-001,6.3,0.60,175.0,25.0,20.0,0.75,1.5,0.2,0.1,0.15,0.45,10,500,50,0,0,0,800,500

URS & FS — user requirements and functional specification

This document defines user requirements and functional specification for the quality-control utility. It supports deployment discussion, IQ/OQ preparation and QC workflow integration.

Utility: NorelgestrominEthinylestradiolPatchQualityCheckerAPI / object: Norelgestromin Ethinylestradiol PatchCategory: Contraceptives

1. Scope

The Norelgestromin Ethinylestradiol Patch Quality Checker utility is used for Norelgestromin Ethinylestradiol Patch. The actual input.csv is the source of truth for the input structure; control criteria are defined by the executable and the domain description.

The utility does not use machine learning; decisions are produced by deterministic rules.

Categories: Contraceptives

Tags: assay, biologics, contraceptives, fixed-dose combinations, heavy metals, hormones, impurities, microbiology, radiopharma, residual solvents

2. Execution modes

NorelgestrominEthinylestradiolPatchQualityChecker.exe                            → demo mode (console output)
NorelgestrominEthinylestradiolPatchQualityChecker.exe input.csv output.json      → evaluate your data

3. Key controlled areas

assay / content
purity and impurities
residual solvents
microbiology and pathogens
heavy metals / elemental impurities
pH and physicochemical parameters

4. Domain limits and critical parameters

⚠️ CRITICAL for transdermal systems! Release rate is key efficacy parameter. Adhesion ≥1.0 N — prevents patch detachment! Microbiology important for skin contact.
⚠️ CRITICAL:
Norelgestromin release rate 150–200 mcg/24h — ensures contraceptive efficacy
EE release rate 20–30 mcg/24h — minimizes systemic estrogenic effects
Adhesion ≥1.0 N — critical! Patch must stay securely on skin during movement, bathing, sweating
Patch area 20 cm² (±10%) — affects release rate
Absence of pathogens (E. coli, Salmonella) — important for skin contact, especially with possible microtraumas
⚠️ Special attention: Transdermal systems have UNIQUE requirements! Release rate tested by Franz cell method (through artificial membrane simulating skin). Adhesion tested on standard surface (glass, skin) with peel force measurement. Patch must maintain adhesion for 7 days under normal use conditions.
Critical parameters:
Norelgestromin content: 6.0–6.6 mg/patch (6.3 ± 5%)
Ethinylestradiol content: 0.55–0.65 mg/patch (0.6 ± 8.3%)
Norelgestromin release rate: 150–200 mcg/24h
EE release rate: 20–30 mcg/24h
Patch area: 18–22 cm²
Patch thickness: 0.5–1.0 mm
Adhesion: ≥1.0 N (peel force)
Norelgestromin 3-keto: ≤0.5%
Norelgestromin epimer: ≤0.5%
Ethinylestradiol 17-epimer: ≤0.5%
Total impurities: ≤1.0%
Heavy metals: ≤20 ppm
TAMC: ≤1000 CFU/g
TYMC: ≤100 CFU/g
Absence of E. coli and Salmonella

Limits stated in the description must be verified against the current approved specification, pharmacopoeial monograph and registration dossier before production use.

5. URS — user requirements

ID	Requirement	Criticality	Acceptance criterion
URS-001	The system shall accept an `input.csv` file for Norelgestromin Ethinylestradiol Patch with the exact columns listed in the “Input data contract” section.	High	A file with the correct header is processed without manual editing; missing mandatory columns produce FAIL/import error.
URS-002	The system shall support execution without arguments in demo mode and execution with `input.csv output.json` for user data.	Medium	Both execution scenarios produce a predictable result or clear diagnostic error.
URS-003	The system shall perform rule-based controls for: assay / content, purity and impurities, residual solvents, microbiology and pathogens, heavy metals / elemental impurities, pH and physicochemical parameters.	High	Each controlled parameter receives a status and message; the result does not depend on hidden Excel formulas or ML.
URS-004	The system shall preserve traceability between batch/lot, source values, applied rules and final verdict.	High	Output includes batch identifier, source values, parameter statuses and critical findings.
URS-005	The system shall generate machine-readable `output.json` for LIMS/ELN/MES, batch record and QA/QC review.	High	JSON contains overall status, check array, warnings, failures and source-file reference.
URS-006	The system shall support use in the client validation package: URS/FS, IQ/OQ preparation, installation and operational scenario checks.	High	The document, test scenarios and reproducible CSV/JSON flow are suitable for audit and internal approval.
URS-007	The system shall clearly separate technical data errors from specification nonconformities.	Medium	Schema/type errors are not mixed with pharmacopoeial deviations and are reported separately.

6. input.csv data contract

The source of truth for the input schema is the actual input.csv header. Column names are technical identifiers and are not translated.

#	Column	Type	Unit	Description	Sample	Control rule
1	`BatchNumber`	identifier	as specified	Batch Number	`PATCH-2026-001`	mandatory field; used for batch/lot traceability
2	`NorelgestrominContent`	decimal	as specified	Norelgestromin Content	`6.3`	numeric value; compared with assay/purity limit from specification or method
3	`EthinylestradiolContent`	decimal	as specified	Ethinylestradiol Content	`0.60`	numeric value; compared with assay/purity limit from specification or method
4	`NorelgestrominReleaseRate`	decimal	as specified	Norelgestromin Release Rate	`175.0`	mandatory numeric value; rule comparison is performed by the utility
5	`EthinylestradiolReleaseRate`	decimal	as specified	Ethinylestradiol Release Rate	`25.0`	mandatory numeric value; rule comparison is performed by the utility
6	`PatchArea`	decimal	as specified	Patch Area	`20.0`	mandatory numeric value; rule comparison is performed by the utility
7	`PatchThickness`	decimal	as specified	Patch Thickness	`0.75`	mandatory numeric value; rule comparison is performed by the utility
8	`AdhesionForce`	decimal	as specified	Adhesion Force	`1.5`	mandatory numeric value; rule comparison is performed by the utility
9	`ImpurityNorel3Keto`	decimal	as specified	Impurity Norel3 Keto	`0.2`	numeric value; compared with individual or total impurity limit
10	`ImpurityNorelEpimer`	decimal	as specified	Impurity Norel Epimer	`0.1`	numeric value; compared with individual or total impurity limit
11	`ImpurityEE17Epi`	decimal	as specified	Impurity EE17 Epi	`0.15`	numeric value; compared with individual or total impurity limit
12	`TotalImpurities`	decimal	as specified	Total Impurities	`0.45`	mandatory numeric value; rule comparison is performed by the utility
13	`HeavyMetals`	decimal	as specified	Heavy Metals	`10`	numeric value; checked as elemental/metal impurity
14	`TAMC`	decimal	as specified	TAMC	`500`	numeric value; compared with microbiological limits
15	`TYMC`	decimal	as specified	TYMC	`50`	numeric value; compared with microbiological limits
16	`EColiDetected`	boolean / flag	0/1	EColi Detected	`0`	valid flag required; prohibited organisms and growth are normally expected as 0 / absent
17	`SalmonellaDetected`	boolean / flag	0/1	Salmonella Detected	`0`	valid flag required; prohibited organisms and growth are normally expected as 0 / absent
18	`PackagingIntegrityTest`	decimal	as specified	Packaging Integrity Test	`0`	mandatory numeric value; rule comparison is performed by the utility
19	`EthanolPPM`	decimal	ppm	Ethanol PPM	`800`	numeric value; checked as residual solvent against the applicable limit
20	`AcetonePPM`	decimal	ppm	Acetone PPM	`500`	numeric value; checked as residual solvent against the applicable limit

CSV example

BatchNumber,NorelgestrominContent,EthinylestradiolContent,NorelgestrominReleaseRate,EthinylestradiolReleaseRate,PatchArea,PatchThickness,AdhesionForce,ImpurityNorel3Keto,ImpurityNorelEpimer,ImpurityEE17Epi,TotalImpurities,HeavyMetals,TAMC,TYMC,EColiDetected,SalmonellaDetected,PackagingIntegrityTest,EthanolPPM,AcetonePPM
PATCH-2026-001,6.3,0.60,175.0,25.0,20.0,0.75,1.5,0.2,0.1,0.15,0.45,10,500,50,0,0,0,800,500

7. FS — functional specification

ID	Function	Implementation description
FS-001	CLI entry point	The executable `NorelgestrominEthinylestradiolPatchQualityChecker.exe` supports demo mode and `input.csv output.json` processing mode.
FS-002	CSV parser	The import module reads CSV, validates header, column presence/order, value count and encoding. Decimal values are expected with a dot separator.
FS-003	Field conversion	Each column is converted to the expected type: identifier, text, decimal number, date/time or boolean flag.
FS-004	Domain rule engine	For Norelgestromin Ethinylestradiol Patch, explicit rules are applied: range, minimum, maximum, absence of prohibited flag, data completeness or calculation-based check.
FS-005	Criticality handling	Critical violations produce FAIL; non-critical deviations and incomplete data produce WARNING; full conformance produces PASS.
FS-006	JSON writer	`output.json` stores overall status, per-parameter results, source values, warnings, failures and diagnostic messages.
FS-007	Integration contract	The CSV → JSON format is stable for invocation from LIMS/ELN/MES, scheduled task or wrapper service.
FS-008	Error handling	Schema error, missing file, non-numeric value or JSON write failure returns diagnosable error without silent PASS.

8. output.json contract

The output file must be suitable for automated processing, audit review and correlation with the source input.csv row.

{
  "utility": "NorelgestrominEthinylestradiolPatchQualityChecker",
  "api": "Norelgestromin Ethinylestradiol Patch",
  "batchNumber": "PATCH-2026-001",
  "overallStatus": "PASS|WARNING|FAIL",
  "checkedAtUtc": "2026-05-18T00:00:00Z",
  "checks": [
    {
      "parameter": "BatchNumber",
      "value": "PATCH-2026-001",
      "unit": "as specified",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "NorelgestrominContent",
      "value": "6.3",
      "unit": "as specified",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "EthinylestradiolContent",
      "value": "0.60",
      "unit": "as specified",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "NorelgestrominReleaseRate",
      "value": "175.0",
      "unit": "as specified",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "EthinylestradiolReleaseRate",
      "value": "25.0",
      "unit": "as specified",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "PatchArea",
      "value": "20.0",
      "unit": "as specified",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "PatchThickness",
      "value": "0.75",
      "unit": "as specified",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "AdhesionForce",
      "value": "1.5",
      "unit": "as specified",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    }
  ],
  "criticalFindings": [],
  "sourceFile": "input.csv"
}

9. OQ/PQ test scenarios

ID	Scenario	Expected result
TC-001	Valid CSV with expected header and sample row	All rows are processed; output contains PASS/WARNING/FAIL and parameter-level detail.
TC-002	A mandatory input.csv column is missing	Import is rejected or the row receives FAIL with schema reference.
TC-003	A numeric field contains text or a blank value	Type conversion error is recorded; the result is not hidden as PASS.
TC-004	A parameter is outside specification or critical limit	Critical parameters produce FAIL; non-critical deviations produce WARNING according to the rule.
TC-005	Positive pathogen/microbiological flag or microbiological limit excursion	Critical FAIL is produced with the offending parameter.
TC-007	Residual solvent above applicable limit	FAIL is produced with solvent name and measured value.

10. QA/QC, CSV and change control

Before production use, the client records executable version, checksum, specification/monograph version, test CSV, expected JSON and IQ/OQ results.
Column names must not be changed without updating the validator and test scenarios.
The source CSV, output.json and utility version should be stored together as an evidence package.
Any change in control rules must go through change control and repeated OQ scenario verification.

Included in packages

Contraceptives QC Suite

Quality-control package for contraceptives: hormonal APIs, fixed combinations, implants, rings and intrauterine systems.

Open

Endocrinology QC Suite

QC package for endocrinology: thyroid, pituitary/peptide hormones, corticosteroids, sex hormones and selected metabolic medicines.

Open

Gynecology QC Suite

QC package for gynecology: hormones, contraceptives, uterotonics, anti-infectives and women’s-health medicines.

Open

Radiology QC Suite

QC package for radiology and diagnostic imaging: radiopharmaceuticals, PET/SPECT, contrast media, iodinated and gadolinium products, plus particle, sterility and endotoxin checks.

Open