Emerson et al listed criteria for various types of early gestation as seen on endovaginal sonography (EVS). The authors are from the University of Tennessee.
Categories of early gestation:
(1) viable and intrauterine
(2) failed and intrauterine
(3) ectopic
(4) indeterminate
|
Structure |
Size |
Features |
Diagnosis |
|
intrauterine gestational sac |
NA |
double sac sign or embryonic structure |
viable |
|
intrauterine gestational sac |
>= 1 cm |
no yolk sac |
failed |
|
intrauterine gestational sac |
> 1.5 cm |
no fetal pole |
failed |
|
intrauterine gestational sac |
> 1.5 cm |
no cardiac activity |
failed |
|
intrauterine gestational sac |
< 1 cm |
neither double sac sign nor embryonic structures |
indeterminate |
|
intrauterine sac abnormally low in the uterus |
NA |
NA |
failed |
|
extrauterine gestational sac |
NA |
with or without embryonic structures |
ectopic |
|
NA |
NA |
large amount of pelvic fluid |
ectopic |
|
adnexal mass |
NA |
separate from uterus and ovary |
ectopic |
|
adnexal mass |
NA |
originating from ovary |
indeterminate |
|
nothing |
NA |
NA |
indeterminate |
where:
• An ectopic gestation should have either an empty uterus or abnormal endometrial fluid.
• Nothing = empty uterus AND no adnexal gestational sac AND no adnexal mass.
• In the implementation the combination of intrauterine gestational sac, diameter > 1.5 cm, and cardiac activity was added as evidence of a viable pregnancy. This was to balance criteria for a failed gestation.
Specialty: Obstetrics & Gynecology, Pedatrics
ICD-10: ,
