1st Trimester Flashcards
(50 cards)
After ovulation, conception usually occurs within ____
24 hours
Sperm + ovum =
Zygote
Zygote forms into the ___
Morula
Morula becomes the ___
Blastocyst
Outer layer of blastocyst is made up of _____ cells
Trophoblastic cells
The cells that produce hCG
Trophoblastic cells
Inner part of blastocyst develops into
Embryo, amnion, umbilical cord, yolk sacs
Trophoblastic tissue develops into
Placenta and chorion
Blastocyst begins to implant into the decidualized endometrium by day ___ of menstrual cycle
Day 20-21 of menstrual cycle
Implantation is complete by day
Day 28
Blastocyst connects to endometrium via small projections called:
Chorionic villi
Chorion
Gestational sac
HCG is detected in the maternal blood as early as
23 days menstrual age
Gestational sac should be visualized transvaginally when hCG levels are
Between 1000 and 2000 mlU
Normal hCG levels double every ____ hours in the 1st trimester
48 hours
In first trimester, thermal index should be kept below ____
1
Decidual reaction
Endometrium becomes thick and echogenic in preparation for implantation
First definitive sonographic sign of an IUP
Gestational sac
To distinguish gestational sac vs pseudogestational sac, look for
Double sac sign or double decidual sign
Double sac/ double decidual sign
Two rings surrounding a true gestational sac. Inner(capsularis) outer(parietalis)
What sign is this
Double sac sign or double decidual sign
The short arrows are pointing to
Decidua capsularis
The long arrows are pointing to
Decidua parietalis
Earliest measurement to date pregnancy
Mean Sac Diameter(MSD)
