High molecular weight polar compounds remain invisible to volatile analysis yet represent serious toxicity risks - water-soluble additives, hydrophilic degradation products, and polar processing residues require specialized detection methods beyond standard GC approaches. Polar semi-volatile compound screening through water extraction at elevated temperature followed by GC-MS analysis provides comprehensive characterization of water-soluble organic substances with lower volatility that headspace methods cannot detect. This ISO 10993-12 and 10993-18 compliant approach captures polar additives including hydrophilic plasticizers and processing aids, hydrophilic degradation products from material breakdown or sterilization reactions, and water-soluble processing residues that pose systemic toxicity risks through direct tissue contact or bloodstream exposure. The extended analysis timeline accommodates thorough characterization of complex samples, including structural elucidation of unknown compounds through fragmentation pattern analysis and toxicological database searching identifying compounds with known safety concerns. Essential for hydrogel devices where water-soluble components directly contact tissue for extended periods, drug-device combinations where polar extractables affect drug stability through pH changes or chemical reactions, and biodegradable implants where degradation products require characterization demonstrating metabolites don't cause toxicity. The elevated extraction temperature accelerates leaching representing extended clinical exposure or worst-case conditions, ensuring detection of slowly migrating compounds that ambient temperature extraction misses. For wound care products, polar extractables directly contact compromised tissue where absorption proves rapid, requiring comprehensive characterization. Cardiovascular implants demand polar screening because blood contact provides direct systemic exposure pathway, while tissue-contacting devices need assessment ensuring chronic exposure doesn't cause local inflammation or sensitization through polar compound accumulation.Article Number