Laboratory Sciences Day, marking the birth of Seyyed Esmaeil Jorjani (physician), is observed annually on Farvardin 30. This observance was officially added to the Jalali calendar in 1382 to honor the vital role of laboratory sciences in the healthcare system and to coincide with the birth anniversary of Seyyed Esmaeil Jorjani, a prominent Iranian physician and scholar, thereby highlighting both the field and Jorjani's scientific legacy. Jorjani was a significant figure in medieval Iranian medicine, and his works, especially the book Zakhireye Khwarazmshahi, had a notable impact on the advancement of medical knowledge in Iran and the broader Islamic world. On this day, medical centers and universities organize events to emphasize the importance of laboratory sciences, the role of laboratory professionals in disease diagnosis and treatment, and to showcase scientific achievements in the field. Jorjani's research in various branches of medicine, including pathology and pharmacology, greatly contributed to the progress of medical science, and his works were taught in academic centers for many years. The designation of this day aimed to honor the efforts of laboratory science professionals and to commemorate Jorjani's scientific legacy. In subsequent years, this day has served as an opportunity to appreciate laboratory workers and to raise public awareness about the crucial role of laboratory diagnostics in community health.