Compliance Resource · Endoscope Reprocessing
AAMI ST91 Flexible & Semi-Rigid Endoscope Reprocessing.
The 2024 compliance guide for flexible endoscope reprocessing — cleaning, high-level disinfection, terminal rinse (with ST108 Category 2 water), drying, storage, staff competency, and quality monitoring. Serving endoscopy suites across Texas, Louisiana, Alabama, and Mississippi.
Six Areas Every Endoscopy Suite Must Document
ST91 organizes endoscope reprocessing into these six control areas. Joint Commission, DNV, and CMS surveyors will ask for documentation in each.
Water quality
Critical water (per ST108 Category 2) for terminal rinse; verified TOC, conductivity, and endotoxin limits.
Manual cleaning
Bedside pre-treatment within manufacturer-defined window (typically < 1 hr); documented brush sizes and channel-flush volumes per scope model.
Storage & drying
Vertical hang or HEPA-filtered drying cabinets; documented drying-cycle validation; storage duration limits based on facility risk assessment.
Staff competency
Initial + annual competency validation for every scope model reprocessed. Records must be produceable within 24 hours of survey request.
Quality monitoring
Documented daily leak tests, weekly ATP/protein or borescope inspections, and quarterly microbial cultures per scope family.
Traceability
Scope-to-patient linkage: which endoscope was used on which patient, with reprocessing operator and cycle data captured electronically.
Reference: ANSI/AAMI ST91:2021. Consult the full standard for complete requirements.
How Sterile Mate Supports ST91 Compliance
One dispatch center in Houston serving endoscopy suites across the Gulf region — from major academic centers to critical-access hospitals.
Terminal-Rinse Water
ST108 Category 2–compliant central RO + polishing loops sized for endoscopy suite peak demand. Includes ongoing endotoxin/TOC/conductivity testing.
Borescope + ATP Kits
Weekly quality-monitoring supplies for every scope family: borescope inspection heads, ATP swabs, protein-detection swabs — all documented and audit-ready.
Drying & Storage
HEPA-filter replacements for drying cabinets, storage-duration risk-assessment templates, and PM plans that match manufacturer IFUs.
Frequently Asked Questions
What is AAMI ST91?
ANSI/AAMI ST91:2021 — 'Flexible and semi-rigid endoscope processing in health care facilities' — is the U.S. consensus standard for reprocessing flexible endoscopes (GI, bronchoscopes, cystoscopes, ENT scopes, etc.). It defines cleaning, high-level disinfection or sterilization, drying, storage, staff competency, and quality-monitoring requirements. It replaced ST58's endoscope content and consolidates prior TIR reports.
How does ST91 relate to ST108?
ST91 defines endoscope reprocessing workflow; ST108 defines the water used at every stage of that workflow. Terminal-rinse water for flexible endoscopes must meet ST108 Category 2 (Critical Water) limits. A facility cannot be ST91-compliant without ST108-compliant water.
How is ST91 different from ST79?
ST79 covers steam sterilization of reusable medical devices (surgical instruments, rigid endoscopes, etc.). ST91 covers flexible + semi-rigid endoscopes, which are typically high-level disinfected (not steam-sterilized). Many hospitals need both standards for a complete SPD compliance program.
What are the most common ST91 survey findings?
Top survey findings include: (1) missing terminal-rinse water quality documentation (ST108 Cat 2 gap), (2) inadequate drying-cycle validation, (3) incomplete staff competency records per scope model, (4) missing borescope or ATP monitoring, and (5) storage-duration policies not backed by facility risk assessment.
How does Sterile Mate help facilities meet ST91?
Sterile Mate provides ST108-compliant terminal-rinse water systems, borescope + ATP inspection kits, drying-cabinet HEPA replacements, and documented preventative-maintenance/compliance-audit binders. We serve endoscopy suites across Texas, Louisiana, Alabama, and Mississippi with same-day dispatch from Houston.
Endoscope-borne infection outbreaks are climbing — surveyors are following.
CDC and FDA have both issued advisories on duodenoscope- and bronchoscope-associated infections. Joint Commission is now regularly citing ST91 non-conformance under IC.02.02.01 (medical equipment reprocessing). Request an endoscopy audit — one-business-day turnaround.