OBGYN Mock Registry Exam questions and answers graded A+

OBGYN Mock Registry Exam questions and answers graded A+ the gestational sac grows appoximately: a. 8 mm per day b. 1 cm per day c. 8 cm per day d. 1 mm per day d. 1 mm per day What structures are formed within the embryo by the end of the 10th week? a. Rudimentary forms of the heart and brain b. Heart and brain are completely formed c. All rudimentary forms of all organs and structures d. All organs and structures are completely formed c. All rudimentary forms of all organs and structures What is the first sonographically identifiable sign of a Possible pregnancy? a. Double bleb sign b. Gestational sac c. Yolk sac d. Decidual reaction of the endometrium d. Decidual reaction of the endometrium What is a normal heart rate for a fetus at 9 weeks gestational age? a. 90 -115 bpm b. 160 -180 bpm c. ~140 bpm d. 140 -160 bpm d. 140 -160 bpm The structure created by the union of the sperm and the egg is the? a. Morula b. Zygote c. Blastocyst d. Ampulla b. Zygote According to the ALARA principle which thermal index setting should be used prior to 10 weeks gestation? a. MI b. TIB c. TIS d. TIC c. TIS GA (gestational age) of 12 weeks 4 days would be considered which trimester? a. First trimester b. Third trimester c. Between the 1st and 2nd trimesters d. Second trimester a. First trimester The maternal portion of the placenta is? a. Decidua Vera b. Decidua basalis c. Decidua parietalis d. Decidua capsularis b. Decidua basalis What is the term for the structure that forms the brain and spinal cord? a. Primitive streak b. Amniotic sac c. Neural tube d. Rhombencephalon c. Neural tube What is the extension of the posterior wall of the yolk sac that becomes the umbilical blood vessels is called? a. Urachus b. Allantois c. Exocelomic d. Germ Cells b. Allantois How many hours after ovulation does fertilization take place? a. Within 24 hours b. 72 hours c. 4 days d. 24 to 36 hours d. 24 to 36 hours What is the most accurate measurement used for dating a pregnancy in the first trimester? a. None of the above b. Nuchal Translucency (NT) c. Mean Sac Diameter (MSD) d. Crown Rump Length (CRL) d. Crown Rump Length (CRL) According to the ALARA principle which thermal index setting should be used after 10 weeks gestation? a. TIB b. TIS c. TIC d. MI a. TIB What is the process that establishes all 3 germ layers in the embryo? a. Neuralization b. Implantation c. Gastrulation d. Gestation c. Gastrulation The fetal portion of the placenta is? a. Chorion frondosum b. Decidua basalis c. Decidua Vera d. Decidua capsularis a. Chorion frondosum When does the yolk sac typically detach from the yolk stalk? a. Around 10 weeks gestation b. Around 8 weeks gestation c. Around 6 weeks gestation d. Around 12 weeks gestation b. Around 8 weeks gestation What is the solid echogenic structure seen in the lateral ventricles during the 9th - 10th week of fetal development? a. The cerebellum b. Cortex of the brain c. Rhombencephalon d. Choroid plexus d. Choroid plexus The midbrain is called. a. Mesencephalon b. Prosencephalon c. Encephalon d. Rhombencephalon a. Mesencephalon The hindbrain is called. a. Mesencephalon b. Encephalon c. Prosencephalon d. Rhombencephalon d. Rhombencephalon What portion of the endometrium closes over and covers the burrowing blastocyst? a. Decidua capsularis b. Decidua basalis c. Chorion frondosum d. Decidua Vera a. Decidua capsularis How long does a normal pregnancy lasts? a. 280 days b. All choices are correct c. 40 weeks d. 9 months b. All choices are correct Fertilization usually occurs in which part of the fallopian tube? a. Isthmus b. Ampulla c. Fimbria d. Interstitial b. Ampulla When will the spine be detectable in most fetuses? a. 12 weeks b. 10 weeks c. 8 weeks d. 6 weeks a. 12 weeks The innermost germ layer in the embryo is called. a. Mesoderm b. Blastoderm c. Ectoderm d. Endoderm d. Endoderm Why does the outer shell of the zygote harden? a. In preparation for Implantation b. To prevent additional sperm from entering the ovum and to prevent implantation in the fallopian tube c. To prevent ova from splitting too early and implanting in the fallopian tube b. To prevent additional sperm from entering the ovum and to prevent implantation in the fallopian tube What is the first structure seen inside a gestational sac sonographically? a. Amnion b. Fetal pole c. Secondary yolk sac d. Primary yolk sac c. Secondary yolk sac When is the CRL measurement no longer accurate? a. Before 12 weeks b. After 12-13 weeks c. CRL can be used throughout pregnancy d. 12-13 weeks b. After 12-13 weeks A morula is a zygote that contains? a. Only 16 cells b. More than 16 cells c. At least 16 cells c. At least 16 cells What is the term for the structure formed by the thickening of the 3 germ layers? a. Amniotic sac b. Neural tube c. Primitive streak d. Rhombencephalon c. Primitive streak A rapid division of cells that begins 24 to 30 hours after fertilization is called? a. Cleavage b. Implantation c. Blastocyst d. Gastrulation a. Cleavage What can cross the zona pellucida of a fertilized ovum? a. The inner cell mass b. Trophoblastic cells c. Endometrial secretions d. Additional sperm c. Endometrial secretions When should the amnion and chorion fuse by? a. No later than 10 weeks gestation b. No later than 8 weeks gestation c. No later than 16 weeks gestation d. No later than 12 weeks gestation c. No later than 16 weeks gestation Trophoblastic cells produce? a. hCG which extends the life of the corpus luteum and enzymes that erode the endometrial surface to allow implantation b. Progesterone which prevents shedding of the uterine lining and estrogen that erodes the endometrial surface to allow implantation a. hCG which extends the life of the corpus luteum and enzymes that erode the endometrial surface to allow implantation How many hours after ovulation does fertilization take place? a. 24 to 36 hours b. Within 24 hours c. 72 hours d. 4 days a. 24 to 36 hours The implantation window refers to the time frame? a. 4 days before ovulation and lasts 4 days b. 6 to 8 days after ovulation and lasts 4 days c. 6 -8 days before ovulation and lasts 3 days d. 4 days after ovulation and lasts 6 -8 days b. 6 to 8 days after ovulation and lasts 4 days Visibility of this structure predicts a viable pregnancy in over 90% of cases. a. Gestational sac b. Vitelline duct c. Fetal Pole d. Yolk Sac d. Yolk Sac When does the blastocyst mass usually attaches to the endometrium? a. 4 days after fertilization b. 6 days after fertilization c. 8 days after fertilization d. 10 days after fertilization b. 6 days after fertilization GA (gestation age) of 12 weeks 4 days would be considered which trimester? a. First trimester b. Third trimester c. Between the 1st and 2nd trimester d. Second trimester a. First trimester What is the solid echogenic structure seen in the lateral ventricles during the 9th-10th week of fetal development? a. the cerebellum b. cortex of the brain c. rhombencephalon d. choroid plexus d. choroid plexus Why does the outer shell of the zygote harden? a. In preparation for implantation b. To prevent additional sperm from entering the ovum and to prevent implantation in the fallopian tube c. To prevent ova from splitting too early and implanting in the fallopian tube b. To prevent additional sperm from entering the ovum and to prevent implantation in the fallopian tube Which of the following describes an abnormal umbilical artery Doppler waveform finding associated with fetal hypoxia? a. low resistance waveform b. absent or reversed diastolic flow c. continuous flow during diastole d. high systolic and diastolic flow b. absent or reversed diastolic flow In the late second trimester, anterior - posterior diameter of the normal renal pelvis should not exceed: a. 4 mm b. 7 mm c. 1 mm d. 10 mm a. 4 mm The arrow identifies which of the following fetal structure? a. gallbladder b. renal cyst c. stomach d. renal pelvis c. stomach Which of the following patient positions is preferred for translabial imaging? a. supine b. decubitus c. Trendelenburg d. lithotomy d. lithotomy Which of the following is the non-sonographic component of a biophysical profile assessment? a. assessment of gross fetal body movement b. non-stress test c. assessment of fetal tone d. fetal breathing movements b. non-stress test Which of the following is not a fetal anatomical landmark for obtaining an abdominal circumference? a. stomach b. kidneys c. umbilical portion of the left portal vein d. spine b. kidneys Cavum septum pellucidi is located in the: a. anterior portion of the fetal chest b. posterior portion of the fetal chest c. posterior portion of the fetal brain d. anterior portion of the fetal brain d. anterior portion of the fetal brain Arrow B identifies the: a. cisterna magna b. cerebellum c. nuchal fold d. fourth ventricle a. cisterna magna Choroid plexus cysts should normally regress by: a. 16 weeks b. 12 weeks c. 28 weeks d. 26 weeks d. 26 weeks