OB TIMELINE (WEEKS & NUMBERS)
QUESTIONS AND ANSWERS 100%
CORRECT!!!
Which one of the following statements about the gestational sac is FALSE?
a. Blood tests should be positive 7 - 10 hours after conception
b. The earliest structure observed within the gestational sac is the yolk sac
c. The embryo may be seen at 4 weeks with transvaginal ultrasound
d. The placenta is seen as a thickened density along part of the margin of the
gestational sac - ANSWERS✔✔a. Blood tests should be positive 7 - 10 hours
after conception
Which one of the following statements about the embryo heart rate is FALSE?
a. Early in the developmental phase, the heart rate is greater than 190 bpm
b. Early in the developmental phase, the heart rate is 90 bpm
c. The rate may increase to 170 bpm in the middle of the first trimester
d. The rate is 120 - 140 bpm in the second & third trimester -
ANSWERS✔✔a. Early in the developmental phase, the heart rate is greater
than 190 bpm
Which of the following statements about the amniotic fluid development is
true?
a. The fetal kidneys begin to produce urine in the first trimester
b. In the first trimester, fluid is produced by the placenta
c. The fluid decreases in volume until the 34th week
d. The fetus gains two thirds of its weight during the first two trimesters -
ANSWERS✔✔b. In the first trimester, fluid is produced by the placenta
The dates established by sonography examinations performed in the second
trimester typically take precedence over the menstrual age when the
discrepancy is greater than _____ days.
a. 5
b. 7
,c. 10
d. 15 - ANSWERS✔✔c. 10
Fetal anatomy may be assessed accurately after _____ weeks gestation.
a. 14
b. 16
c. 18
d. 21 - ANSWERS✔✔c. 18
Interval fetal growth may be determined by sonographic measurements ____
weeks apart.
a. 1 to 2
b. 2 to 3
c. 2 to 4
d. 4 to 6 - ANSWERS✔✔c. 2 to 4
Even with a known menstrual date, conception may occur from day ______ to
day ______.
A) 1; 15
B) 6; 27
C) 10; 18
D) 15; 27 - ANSWERS✔✔B) 6; 27
The 2nd trimester is between _____ gestational weeks.
a. 12 - 21
b. 12 -28
c. 13 - 26
d. 15 - 30 - ANSWERS✔✔c. 13 - 26
Approximately _____% of all pregnant women in the USA are examined with
sonography.
a. 50
b. 65
c. 75
, d. 100 - ANSWERS✔✔b. 65
Diagnostic ultrasound has been in use since late in which one of the following
decades?
a. 1940s
b. 1950s
c. 1960s
d. 1970s - ANSWERS✔✔b. 1950s
Where is the rhombencephalon located on a 10 wk obstetric scan?
a. Frontal and cephalic
b. Posterolateral
c. Rostral to the xygomatic bone
d. Posterior midline
e. Ventral midline - ANSWERS✔✔d. Posterior midline
You are scanning a 10 week pregnancy with the dates verified by ultrasound.
You spot a bright echo within the gestational sac. What would this echo be?
a. corpus albicans
b. normal amnion
c. trophoblast
d. dedidua basalis - ANSWERS✔✔b. normal amnion
What is the equation for mean sac diameter?
a. MSD = L x W x AP / 3
b. MSD = L + W + AP / 3
c. length x width x height
d. length + width + height - ANSWERS✔✔b. MSD = L + W + AP / 3
TRUE OR FALSE: CRL is measured between 12 - 16 weeks. -
ANSWERS✔✔FALSE
Use the earliest ultrasound with a CRL of at least 10mm (around 7 weeks)
QUESTIONS AND ANSWERS 100%
CORRECT!!!
Which one of the following statements about the gestational sac is FALSE?
a. Blood tests should be positive 7 - 10 hours after conception
b. The earliest structure observed within the gestational sac is the yolk sac
c. The embryo may be seen at 4 weeks with transvaginal ultrasound
d. The placenta is seen as a thickened density along part of the margin of the
gestational sac - ANSWERS✔✔a. Blood tests should be positive 7 - 10 hours
after conception
Which one of the following statements about the embryo heart rate is FALSE?
a. Early in the developmental phase, the heart rate is greater than 190 bpm
b. Early in the developmental phase, the heart rate is 90 bpm
c. The rate may increase to 170 bpm in the middle of the first trimester
d. The rate is 120 - 140 bpm in the second & third trimester -
ANSWERS✔✔a. Early in the developmental phase, the heart rate is greater
than 190 bpm
Which of the following statements about the amniotic fluid development is
true?
a. The fetal kidneys begin to produce urine in the first trimester
b. In the first trimester, fluid is produced by the placenta
c. The fluid decreases in volume until the 34th week
d. The fetus gains two thirds of its weight during the first two trimesters -
ANSWERS✔✔b. In the first trimester, fluid is produced by the placenta
The dates established by sonography examinations performed in the second
trimester typically take precedence over the menstrual age when the
discrepancy is greater than _____ days.
a. 5
b. 7
,c. 10
d. 15 - ANSWERS✔✔c. 10
Fetal anatomy may be assessed accurately after _____ weeks gestation.
a. 14
b. 16
c. 18
d. 21 - ANSWERS✔✔c. 18
Interval fetal growth may be determined by sonographic measurements ____
weeks apart.
a. 1 to 2
b. 2 to 3
c. 2 to 4
d. 4 to 6 - ANSWERS✔✔c. 2 to 4
Even with a known menstrual date, conception may occur from day ______ to
day ______.
A) 1; 15
B) 6; 27
C) 10; 18
D) 15; 27 - ANSWERS✔✔B) 6; 27
The 2nd trimester is between _____ gestational weeks.
a. 12 - 21
b. 12 -28
c. 13 - 26
d. 15 - 30 - ANSWERS✔✔c. 13 - 26
Approximately _____% of all pregnant women in the USA are examined with
sonography.
a. 50
b. 65
c. 75
, d. 100 - ANSWERS✔✔b. 65
Diagnostic ultrasound has been in use since late in which one of the following
decades?
a. 1940s
b. 1950s
c. 1960s
d. 1970s - ANSWERS✔✔b. 1950s
Where is the rhombencephalon located on a 10 wk obstetric scan?
a. Frontal and cephalic
b. Posterolateral
c. Rostral to the xygomatic bone
d. Posterior midline
e. Ventral midline - ANSWERS✔✔d. Posterior midline
You are scanning a 10 week pregnancy with the dates verified by ultrasound.
You spot a bright echo within the gestational sac. What would this echo be?
a. corpus albicans
b. normal amnion
c. trophoblast
d. dedidua basalis - ANSWERS✔✔b. normal amnion
What is the equation for mean sac diameter?
a. MSD = L x W x AP / 3
b. MSD = L + W + AP / 3
c. length x width x height
d. length + width + height - ANSWERS✔✔b. MSD = L + W + AP / 3
TRUE OR FALSE: CRL is measured between 12 - 16 weeks. -
ANSWERS✔✔FALSE
Use the earliest ultrasound with a CRL of at least 10mm (around 7 weeks)
