OECD Respiratory Sensitisation Review Maps Path To Non-Animal Testing

The OECD respiratory sensitisation review, published on 10 August 2026, sets out the scientific and regulatory work needed to develop non-animal methods for identifying respiratory sensitisers. The 122-page final report is relevant to chemical manufacturers, formulators, registrants, testing laboratories, product stewardship teams and occupational health professionals, but it does not create an immediate testing or compliance duty.

Why Respiratory Sensitisation Testing Remains Difficult

Respiratory sensitisation is an immune-mediated allergic reaction affecting the respiratory tract and commonly associated with asthma. Low molecular weight chemicals can be relevant across coatings, adhesives, polymers, cleaning products and speciality chemicals, particularly where workers may encounter vapours, aerosols or dusts.

The OECD states that there are currently no standardised methods for testing this effect. This gap makes hazard identification and regulatory assessment difficult, especially when evidence must distinguish respiratory sensitisation from irritation or other causes of asthma-like symptoms.

The review examines the current regulatory context, biological mechanisms and adverse outcome pathways. It also considers how exposure route, chemical reactivity and immune responses may influence the evidence needed for reliable conclusions.

Candidate Methods Need Validation And Integration

The report surveys in silico, in vitro, ex vivo and in vivo models and allows their readiness to be compared. It provides reference chemicals that can serve as benchmarks when candidate methods are validated and their performance evaluated.

Two supporting spreadsheets provide detailed method evaluations and information on chemicals tested in available approaches. These materials can help researchers and laboratories identify coverage, evidence gaps and areas that require further standardisation.

The OECD respiratory sensitisation review is therefore a scientific foundation rather than a Test Guideline. Its recommendations are intended to support future method development and possible New Approach Methodologies or integrated approaches to testing and assessment.

What Chemical Businesses Should Do Now

Product stewardship and toxicology teams should review how respiratory sensitisation is addressed in hazard assessments, read-across strategies and testing plans. They should document uncertainty, check whether occupational evidence or skin-exposure information is relevant, and avoid treating unvalidated methods as regulatory replacements.

Laboratories and method developers can compare their approaches with the OECD readiness criteria and reference chemicals. Businesses should monitor future OECD validation work and national or regional adoption before changing formal compliance programmes.