Visit our COVID-19 information page (Opens in new window) for the latest information regarding health and safety practices and any location-specific impacts.
To schedule, reschedule or cancel an exam:
We encourage you to schedule/purchase your exam online. Get started by logging in to your web account on the ICC - National Certification and UST/AST website. If you have any trouble, contact us or see our frequently asked questions.
Get help fast! Just click to quickly reach customer service.
If the chat team is temporarily offline, please click on your region below to see alternate contact methods and hours of operation.
Monday–Friday, 7:00 a.m.–10:00 p.m. CT, Saturday, 7:00 a.m.–4:00 p.m. CT, and Sunday, 9:00 a.m.–3:00 p.m. CT; closed on local holidays.
Ask a question
Office Hours: 9:00–18:00 CET (8:00–17:00 GMT) Monday–Friday; closed on local holidays.