Journal of Ultrasound in Medicine, Vol 17, Issue 8 481-484, Copyright © 1998 by American Institute of Ultrasound in Medicine
Measurement of endometrial thickness with transvaginal ultrasonography: is it reproducible?
M. F. Delisle, M. Villeneuve and M. Boulvain
BC Women's Hospital, Vancouver, Canada.
To assess the intraobserver and interobserver variability of transvaginal
ultrasonographic measurement of endometrial thickness, two investigators
(M.V., M.-F. D.) independently evaluated two successive measurements in 55
patients with a 5.0 MHz transvaginal transducer. Each observer was blinded
to his or her own and to the other's results. Measurements were taken at
the maximal thickness in the longitudinal uterine axis. The intraclass
coefficients evaluating the agreement between two measures of a same
observer were 94% and 97%; the coefficient was 94% between the two
investigators. Intraobserver kappa values (agreement on endometrium < or
= 5 mm and > 5 mm) were 0.70 and 0.81, respectively; the interobserver
kappa value was 0.74. Transvaginal sonographic measurement of endometrial
thickness has excellent intraobserver and good interobserver agreement.
However, in clinical practice, an endometrial thickness measuring +/- 1 mm
of a cut-off value should be interpreted with caution, especially when this
may modify the clinical management.