Hearing Specialists Act Article 22

Hearing clinics shall keep their business records and consultation or order sheets issued by the doctors for at least seven (7) years. Where the patient is a minor, related records shall be kept for at least seven (7) years after the patient has reached adulthood.
中文原文 聽力師法第22條
聽力所執行業務之紀錄及醫師開具之照會單或醫囑單,應妥為保管,並至少保存七年。
但個案當事人為未成年人,應保存至其成年後至少七年。

English translation for reference only; the Chinese text prevails. Not legal advice.