Copyright

Ownership

© Apex Ascend Group, LLC (operating as Apex Respiratory). All original content on this site — text, calculators, charts, practice questions, and design — is protected by copyright. Trademarks referenced on the site (including NBRC credential names) belong to their respective owners.

Classroom and personal use

Students and educators may link to any page freely and may use screenshots or printed excerpts for non-commercial classroom instruction with attribution to Apex Respiratory. Wholesale reproduction, redistribution, or commercial use requires written permission via the contact page.

Sources

Clinical pages cite their sources. Formulas, normal values, and clinical thresholds are facts drawn from the cited literature; their expression, explanation, and presentation on this site are original work.

Takedown

If you believe content on this site infringes your copyright, contact us with the page URL and the basis of your claim; legitimate claims are resolved promptly.