There are multiple definitions:

1. adverse drug reaction(English)

   • Adverse effect, Pharmacology / pharmaceutics

2. antegrade dissection and re-entry(English)

   • CTO, PCI
   • Cardiology, Therapeutic approaches
   • https://doi.org…cin.2023.09.021

3. actief donorregistratiesysteem(Dutch)

   • Transplantation
   • https://www.rij…onorregistratie

4. adenoma detection rate(English)

   • an important quality indicator originally developed for screening colonoscopies
   • SDR
   • Oncology, Screening, Gastroenterology
   • https://doi.org…cgh.2013.04.042