Medical; obstetrics and gynecology Study Guide
Questions with Correct Answers / Rated A+ Updated
2026.
1. The normal duration of a human pregnancy (gestation) is
calculated from the first day of the last menstrual period (LMP)
and is approximately:
• A. 260 days (37 weeks)
• B. 280 days (40 weeks)
• C. 300 days (43 weeks)
• D. 320 days (46 weeks)
Correct Answer: B
Rationale: The normal duration of pregnancy is approximately 280
days (40 weeks) from the first day of the last menstrual period
(LMP). This corresponds to about 266 days from conception. Term
pregnancy is defined as 37 0/7 weeks to 42 0/7 weeks of
gestation .
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,2. Naegele's Rule is used to estimate the expected date of
delivery (EDD). The formula is:
• A. LMP + 7 days - 3 months + 1 year
• B. LMP - 7 days + 3 months
• C. LMP + 9 months + 7 days
• D. LMP + 7 days + 3 months
Correct Answer: A
Rationale: Naegele's Rule: EDD = LMP + 7 days - 3 months + 1
year. For example, if LMP is January 1, EDD is October 8. This
assumes a regular 28-day menstrual cycle .
3. A patient is 16 weeks pregnant with an estimated date of
delivery (EDD) of August 15. The provider should perform which
of the following at this visit?
• A. Offer aneuploidy screening
2
, • B. Offer maternal serum alpha-fetoprotein (MSAFP)
screening
• C. Obtain fetal ultrasound for dating
• D. Perform a glucose tolerance test
Correct Answer: B
Rationale: At 16 weeks, the APN should offer maternal serum
alpha-fetoprotein (MSAFP) screening for neural tube defects
(NTDs) between 15-20 weeks. An ultrasound is usually performed
at 18-20 weeks for anatomy. Glucose tolerance testing is done at
24-28 weeks .
4. Human chorionic gonadotropin (hCG) is produced by the:
• A. Corpus luteum
• B. Placental syncytiotrophoblasts
• C. Maternal pituitary gland
• D. Fetal adrenal glands
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, Correct Answer: B
Rationale: Human chorionic gonadotropin (hCG) is produced by the
placental syncytiotrophoblasts. It maintains the corpus luteum and
its production of progesterone and estrogen in early pregnancy.
hCG is the hormone detected by pregnancy tests .
5. The hormone primarily responsible for maintaining early
pregnancy until the placenta takes over is:
• A. Estrogen
• B. Progesterone
• C. hCG
• D. FSH
Correct Answer: C
Rationale: hCG is produced by the syncytiotrophoblasts and
maintains the corpus luteum, which produces progesterone and
estrogen, until the placenta can take over this function.
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Questions with Correct Answers / Rated A+ Updated
2026.
1. The normal duration of a human pregnancy (gestation) is
calculated from the first day of the last menstrual period (LMP)
and is approximately:
• A. 260 days (37 weeks)
• B. 280 days (40 weeks)
• C. 300 days (43 weeks)
• D. 320 days (46 weeks)
Correct Answer: B
Rationale: The normal duration of pregnancy is approximately 280
days (40 weeks) from the first day of the last menstrual period
(LMP). This corresponds to about 266 days from conception. Term
pregnancy is defined as 37 0/7 weeks to 42 0/7 weeks of
gestation .
1
,2. Naegele's Rule is used to estimate the expected date of
delivery (EDD). The formula is:
• A. LMP + 7 days - 3 months + 1 year
• B. LMP - 7 days + 3 months
• C. LMP + 9 months + 7 days
• D. LMP + 7 days + 3 months
Correct Answer: A
Rationale: Naegele's Rule: EDD = LMP + 7 days - 3 months + 1
year. For example, if LMP is January 1, EDD is October 8. This
assumes a regular 28-day menstrual cycle .
3. A patient is 16 weeks pregnant with an estimated date of
delivery (EDD) of August 15. The provider should perform which
of the following at this visit?
• A. Offer aneuploidy screening
2
, • B. Offer maternal serum alpha-fetoprotein (MSAFP)
screening
• C. Obtain fetal ultrasound for dating
• D. Perform a glucose tolerance test
Correct Answer: B
Rationale: At 16 weeks, the APN should offer maternal serum
alpha-fetoprotein (MSAFP) screening for neural tube defects
(NTDs) between 15-20 weeks. An ultrasound is usually performed
at 18-20 weeks for anatomy. Glucose tolerance testing is done at
24-28 weeks .
4. Human chorionic gonadotropin (hCG) is produced by the:
• A. Corpus luteum
• B. Placental syncytiotrophoblasts
• C. Maternal pituitary gland
• D. Fetal adrenal glands
3
, Correct Answer: B
Rationale: Human chorionic gonadotropin (hCG) is produced by the
placental syncytiotrophoblasts. It maintains the corpus luteum and
its production of progesterone and estrogen in early pregnancy.
hCG is the hormone detected by pregnancy tests .
5. The hormone primarily responsible for maintaining early
pregnancy until the placenta takes over is:
• A. Estrogen
• B. Progesterone
• C. hCG
• D. FSH
Correct Answer: C
Rationale: hCG is produced by the syncytiotrophoblasts and
maintains the corpus luteum, which produces progesterone and
estrogen, until the placenta can take over this function.
4
