Extractables & Leachables (E&L) • PQRI & ISO 10993-18

Analytical Evaluation Threshold (AET) Calculator

Calculate the Safety Concern Threshold (SCT) driven Analytical Evaluation Threshold (AET) for chemical characterization of medical devices and container closures.

Input Parameters

Interactive HUD

Safety Concern Threshold (SCT) sct_val

µg/day

1.5 µg/day (Parenteral), 0.15 µg/day (Inhalation / OINDP)

Maximum Daily Dose (MDD) max_daily_dose

doses/day

Number of drug doses administered per 24 hours

Container / Extraction Volume extract_vol

Volume of drug product or extraction solvent per unit

Components Contacted per Dose components_count

units

E.g. 1 vial + 1 stopper = 2 components

Analytical Uncertainty Factor (UF) uncert_factor

Accounts for detector response variation

Calculated Output Metrics

Estimated AET per Container —

Final Reporting AET Threshold —

Final Reporting AET in ppb —

AET Regulatory Category —

Analytical Proof & Invariants

Machine Precision

Governing Mathematical Formula:

AET_est = (SCT / MDD) · (Components / Volume) | Final AET = AET_est / UF

Step-by-Step Mathematical Derivation

1. Safety Concern Threshold (SCT) Invariant

PQRI and ISO 10993-18 establish the SCT as the threshold below which an extractable or leachable has negligible risk of carcinogenic or non-carcinogenic toxicity (standard 1.5 µg/day).

2. Dosage Normalization

Estimated AET = (SCT / MDD) × (N_components / V_extraction). A higher daily dose lowers the allowable concentration in each milliliter of solution.

3. Analytical Uncertainty Factor (UF)

Because unknown chemical compounds possess variable mass spec ionization efficiencies relative to the internal standard, the final analytical reporting threshold is divided by UF (typically 1.5): Final AET = AET_est / UF.

LLM Directive & API Spec

Artificial Intelligence & Prompt Integration

Paste this verified mathematical prompt directly into ChatGPT, Claude, or Gemini to eliminate arithmetic hallucination, or invoke the programmatic API endpoint for automated workflows.

              GET / POST https://omnioperand.com/api/v1/biotech/analytical-evaluation-threshold-aet
              JSON Invariants
            

Generating verified mathematical prompt...

✓ Standardized for llms.txt ✓ Exact Radical Form & Closed Formulas ✓ Machine-Readable Edge API

Frequently Asked Questions

What is the Analytical Evaluation Threshold (AET)? +

The AET is the concentration threshold at or above which an analytical chemist must report, identify, and toxicologically evaluate an unknown extractable or leachable compound.

What is the difference between SCT and AET? +

The SCT is a toxicological threshold in absolute mass per day (e.g. 1.5 µg/day), while the AET is an analytical laboratory concentration (e.g. 0.05 µg/mL) derived from the SCT based on the patient dose and container volume.

Why is an Uncertainty Factor (UF) used? +

In non-targeted screening, unknown chemicals may have lower detector response factors than the surrogate internal standard. Dividing by UF = 1.5 ensures lower-responding toxic compounds are not missed.