RT Book, Section A1 Pfennig, Camiron L. A1 Brown, B. Ethan A2 Knoop, Kevin J. A2 Stack, Lawrence B. A2 Storrow, Alan B. A2 Thurman, R. Jason SR Print(0) ID 1181052961 T1 Ferning Pattern for Amniotic Fluid T2 The Atlas of Emergency Medicine, 5e YR 2021 FD 2021 PB McGraw-Hill PP New York, NY SN 9781260134940 LK accessmedicine.mhmedical.com/content.aspx?aid=1181052961 RD 2024/04/24 AB To distinguish between amniotic fluid due to membrane rupture and normal vaginal secretions in patients beyond the 20th week of pregnancy who present with spontaneous vaginal fluid passage. Characteristic arborization, or typical ferning pattern, confirms amniotic fluid and spontaneous membrane rupture.