Premium
Transvaginal ultrasound scanning in early pregnancy and correlation with human chorionic gonadotropin levels
Author(s) -
Daya Salim,
Woods Sheila,
Ward Susan,
Lappalainen Ray,
Caco Chris
Publication year - 1991
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.1870190303
Subject(s) - gestational sac , medicine , human chorionic gonadotropin , transvaginal ultrasound , gynecology , gonadotropin , pregnancy , gestational age , transvaginal ultrasonography , ultrasonography , obstetrics , ultrasound , gestation , andrology , endocrinology , biology , hormone , surgery , radiology , genetics
Pregnancy can be detected early using transvaginal ultrasonography and human chorionic gonadotropin (hCG) measurements. The purpose of this study was to correlate serum hCG levels with transvaginal gestational sac measurements. The mean sac diameter (MSD) and gestational sac diameter (GSD) were calculated as the mean and cube root of the product, repsectively, of three sac dimensions taken at right angles. A nonlinear relationship between hCG (natural logarithm) and MSD and GSD was observed. The data were best fitted by a second order polynomial regression model (r 2 = 0.98), thereby establishing normal hCG levels for various gestational sac dimensions in early pregnancy.