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Measurement of placental volume with real‐time ultrasound in mid‐pregnancy
Author(s) -
Howe David,
Wheeler Timothy,
Perring Stephen
Publication year - 1994
Publication title -
journal of clinical ultrasound
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.272
H-Index - 61
eISSN - 1097-0096
pISSN - 0091-2751
DOI - 10.1002/jcu.1870220203
Subject(s) - medicine , ultrasound , standard deviation , volume (thermodynamics) , pregnancy , nuclear medicine , mathematics , radiology , statistics , biology , physics , genetics , quantum mechanics
A new method to measure placental volume in mid‐pregnancy using realtime ultrasound is described. The method is an adaptation of the B‐mode parallel planimetric technique. The mean error of in vitro measurements on 45 balloons (mean volume 186 mL range: 88–485 mL) was −2.24 mL, standard deviation 6.76 mL. The error standard deviation of in vivo placental volume measurements was 16.4 mL (volume range: 173–396.5 mL). Placental measurements were made on 175 women between 14.3 weeks and 21.4 weeks, menstrual age (MA) and a smooth centile curve derived. Median volume increased linearly from 144 to 329 mL. The size of the ultrasound probe limits the technique to use before 20 weeks, MA. © 1994 John Wiley & Sons, Inc.