TY  - CHAP
M1  - Book, Section
TI  - Transvaginal Sonography of Ectopic Pregnancy
A1  - Fleischer, Arthur C.
A1  - Desai, Aditi A.
A1  - New, Melinda
A1  - Kanter, Jessica
A1  - Diamond, Michael P.
A2  - Fleischer, Arthur C.
A2  - Abramowicz, Jacques S.
A2  - Gonçalves, Luis F.
A2  - Manning, Frank A.
A2  - Monteagudo, Ana
A2  - Timor, Ilan E.
A2  - Toy, Eugene C.
Y1  - 2017
N1  - 
T2  - Fleischer's Sonography in Obstetrics and Gynecology: Textbook and Teaching Cases, 8e
AB  - Key  TermsEctopic  pregnancy:  a  gestational  sac  located  outside  of  the  uterine  lumen.  The  most  common  location  is  within  the  ampullary  segment  of  the  fallopian  tube  (tubal);  other  locations  include:  interstitial,  cornual,  cervical,  within  a  C-section  scar  (“scar  ectopic”),  intra-abdominal,  or  intraovarian.Pregnancy  of  “unknown  location”:  pregnancy  whose  location  (intra-  or  extrauterine)  cannot  be  determined  sonographically.  Short  interval  (3-5  day)  follow-up  sonography  is  highly  recommended.Concept  of  “discriminatory  zone”:  β-hCG  value  above  which  evidence  of  an  early  intrauterine  pregnancy  should  always  or  reliably  be  seen  on  transvaginal  sonography.  This  concept,  previously  thought  to  be  of  major  diagnostic  value,  has  now  been  shown  to  be  of  limited  value.Doubling  time:  expected  time  interval  when  the  β-hCG  level  doubles  in  a  normal  early  intrauterine  pregnancy.  Typically,  the  expected  normal  increase  of  hCG  is  greater  than  or  equal  to  50%  in  48  hours.  It  should  be  noted,  however,  that  there  is  a  fairly  large  range  of  normal,  physiologic  values.  
SN  - 
PB  - McGraw-Hill Education
CY  - New York, NY
Y2  - 2024/04/19
UR  - obgyn.mhmedical.com/content.aspx?aid=1151031096
ER  -