ETO Residual Testing (Medical Devices)

ETO Residual Testing (Medical Devices)

Ethylene oxide (ETO) is widely used to sterilize medical devices and equipment that cannot withstand the high temperatures of steam sterilization. However, ETO is known to exhibit a number of biological effects which include irritation to mucous membranes and skin, organ damage, and potential carcinogenicity.

Post-sterilization ETO residual testing is mandatory to ensure devices are safe for patient use. We test ETO and its key byproducts — ethylene chlorohydrin (ECH) and ethylene glycol (EG) — per ISO 10993-7 standards, the internationally recognized guideline for EO residuals in medical devices.

Analytes Tested

• Ethylene Oxide (EO) — the primary sterilant
• Ethylene Chlorohydrin (ECH) — toxic reaction byproduct
• Ethylene Glycol (EG) — hydrolysis product

Device Types Tested

• Single-use surgical instruments
• Catheters and cannulas
• IV sets and blood tubing
• Dialysis equipment
• Wound care products
• Implantable devices
• Diagnostic kits and devices

Testing Methodology

ETO residual analysis is performed using GC-headspace analysis with validated methods. Devices are extracted per ISO 10993-12 sample preparation protocols and analyzed against the maximum allowable limits defined in ISO 10993-7 based on device contact type and duration.

Regulatory Limits & Standards

ISO 10993-7:2008 establishes allowable EO and ECH limits based on device category (limited, prolonged, or permanent contact). We provide test reports suitable for regulatory submissions to CDSCO, FDA, CE, and other global health authorities.