RT Book, Section
A1 Usatine, Richard P.
A1 Smith, Mindy A.
A1 Chumley, Heidi S.
A1 Mayeaux, E.J.
SR Print(0)
ID 57675098
T1 Chapter 78. Second Trimester Obstetrical Ultrasound
T2 The Color Atlas of Family Medicine, 2e
YR 2013
FD 2013
PB The McGraw-Hill Companies
PP New York, NY
SN 978-0-07-176964-8
LK accessmedicine.mhmedical.com/content.aspx?aid=57675098
RD 2024/04/19
AB A  23-year-old  pregnant  gravida  2,  para  1  woman  is  being  seen  for  ultrasound  because  of  her  uncertain  dates.  Her  best  recollection  of  her  last  period  gave  her  an  estimated  gestational  age  (EGA)  of  19  weeks.  Her  vital  signs  are  normal  and  her  fundal  height  is  20  cm.  Figures  78-1,  78-2,  and  78-3  are  still  images  taken  from  her  ultrasound  examination  demonstrating  an  EGA  of  21  weeks  and  6  days  by  measurement  of  the  baby's  biparietal  diameter  (BPD),  head  circumference  (HC),  abdominal  circumference  (AC),  and  femur  length  (FL).  All  four  measurements  allow  the  computer  to  calculate  an  estimated  fetal  weight  of  431  g.  The  pregnancy  proceeded  without  complications  and  the  patient  delivered  a  healthy  boy  at  403/7  weeks  based  on  the  ultrasound  calculated  estimated  date  of  delivery.  No  interventions  were  needed  for  postdates  because  of  the  ultrasound  calculations  earlier  in  the  pregnancy.