Question | Answer |
A morula has how many cells? | 16 cells |
What is the membrane formed around a fertilized ovum to make it impermeable for other sperm? | zona pellucida |
Approximately how many days after conception does fertilization occur? | 7-8 days |
What is the first sonographic sign of pregnancy? | Gestational sac |
What are the 3 primary germ layers of the embryo? | Mesoderm, ectoderm, endoderm |
What is the absence of embyo/yolk sac in a gestational sac measuring 20-25 mm or greater? | Blighted ovum / anembryonic gestation |
Failure to identify a yolk sac when gestational sac has reached ___ mm is indicative of an abnormal gestation | 12 mm |
95% of ectopic pregnancies implant where? | Fallopian tubes |
What is the term for a twin pregnancy in which one gestational sac is in the uterine body (normal) and one is elsewhere (ectopic)? | Heterotopic |
Is beta hCG quantitative or qualitative? | Quantitative |
The primitive neural tube closes around which week? | Week 6 |
The corpus luteum secretes which hormone to support pregnancy? | Progesterone |
The most accurate measurement of gestational age and pregnancy dationg from 6-12 weeks is | CRL (crown rump length) |
Upper limits of normal nuchal translucency is ___ mm | 3 mm |
Which lab value is a result of trophoblastic activity? | hCG |
The heart begins to beat around ____ weeks | 5-6 weeks |
A gestational sac should be seen transvaginally when beta hCG levels have reached ______ and transabdonimally when hCG levels have reached ______ | 1000 (TV), 1800-2000 (TA) |
Limb buds can be visualized sonographically around weeks ______ | weeks 6-7 |
The musculoskeletal system is formed by which primary germ layer? | Mesoderm |
The midgut herniation should regress by week ___ | 11 |