Regulations Governing Laboratory Testing for Communicable Diseases and Management of Laboratory Testing Institutions Article 11

With the exception of specimens of Category I and Category V Communicable Diseases of the Act, laboratory testing institutions, upon completion of the laboratory testing reports, shall safekeep the specimens for at least three days before they can be destroyed. However, for pathogen isolates, if their biopsy, blood slide, serum, or plasma specimens are confirmed to contain pathogens or their antibodies, they shall be kept for at least thirty days before they can be destructed.
中文原文 傳染病檢驗及檢驗機構管理辦法第11條
除本法第一類及第五類法定傳染病檢體外,檢驗機構於完成檢驗報告後,檢體應保存至少三日,始得銷毀。
但分離之病原體、經確認內含病原體或其抗體之切片、血片、血清或血漿檢體,應保存至少三十日始得銷毀。

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