CLC EXAM TEST BANK 2025 - CERTIFIED
LACTATION CONSULTANT PRACTICE
QUESTIONS WITH VERIFIED ANSWERS
AND RATIONALES
SECTION 1: PHYSIOLOGY OF LACTATION (Questions 1-
20)
1. What hormone is primarily responsible for milk
production (lactogenesis)?
A) Oxytocin
B) Prolactin
C) Estrogen
D) Progesterone
Answer: B) Prolactin
Rationale: Prolactin is the primary hormone responsible for
stimulating milk synthesis in the mammary gland alveoli. It is
released from the anterior pituitary gland in response to
nipple stimulation and suckling. Prolactin levels peak during
,sleep and at night, which is why nighttime feeding is important
for establishing milk supply.
2. Which hormone is responsible for the milk ejection
reflex (let-down)?
A) Prolactin
B) Oxytocin
C) Progesterone
D) Cortisol
Answer: B) Oxytocin
Rationale: Oxytocin causes the contraction of myoepithelial
cells surrounding the alveoli, forcing milk into the ducts. This
reflex is triggered by nipple stretching with appropriate
latch-on. Oxytocin release can be inhibited by stress, pain, or
anxiety, which is why relaxation is important for effective
feeding.
3. What is the primary function of colostrum?
A) Increase maternal milk supply
B) Provide early immune protection for the newborn
, C) Replace formula completely long-term
D) Prevent maternal dehydration
Answer: B) Provide early immune protection for the
newborn
Rationale: Colostrum is rich in immunoglobulins, especially
secretory IgA, which provides passive immunity to the
newborn by coating the gastrointestinal tract and protecting
against pathogens. It also contains high concentrations of
leukocytes, lactoferrin, and other immune factors.
4. Which of the following mechanisms causes oxytocin to
be released?
A) Complete delivery of the placenta
B) Elevated levels of gastrointestinal hormones
C) Frequent feeding and milk removal
D) Nipple stretching with appropriate latch-on
Answer: D) Nipple stretching with appropriate latch-on
Rationale: Oxytocin is released through neuroendocrine
reflex when the nipple is stretched and stimulated by the
infant's suckling. This triggers the posterior pituitary to
release oxytocin, resulting in the milk ejection reflex.
, 5. Lactogenesis III (maintenance of milk production)
requires which of the following to succeed?
A) Adequate rest and alternating starting breast at each
feed
B) Adequate protein and carbohydrates for the mother
C) Frequent milk removal and nipple stimulation
D) Adequate maternal hydration and lack of maternal
stress
Answer: C) Frequent milk removal and nipple stimulation
Rationale: Lactogenesis III is the maintenance phase of milk
production, which operates on a supply-demand basis.
Frequent and effective milk removal signals the breast to
continue producing milk. Without regular removal, the
Feedback Inhibitor of Lactation (FIL) accumulates and
decreases milk production.
6. What increases gastrin and decreases somatostatin in
babies?
A) Increased stress and anxiety
B) Crying before sleep
LACTATION CONSULTANT PRACTICE
QUESTIONS WITH VERIFIED ANSWERS
AND RATIONALES
SECTION 1: PHYSIOLOGY OF LACTATION (Questions 1-
20)
1. What hormone is primarily responsible for milk
production (lactogenesis)?
A) Oxytocin
B) Prolactin
C) Estrogen
D) Progesterone
Answer: B) Prolactin
Rationale: Prolactin is the primary hormone responsible for
stimulating milk synthesis in the mammary gland alveoli. It is
released from the anterior pituitary gland in response to
nipple stimulation and suckling. Prolactin levels peak during
,sleep and at night, which is why nighttime feeding is important
for establishing milk supply.
2. Which hormone is responsible for the milk ejection
reflex (let-down)?
A) Prolactin
B) Oxytocin
C) Progesterone
D) Cortisol
Answer: B) Oxytocin
Rationale: Oxytocin causes the contraction of myoepithelial
cells surrounding the alveoli, forcing milk into the ducts. This
reflex is triggered by nipple stretching with appropriate
latch-on. Oxytocin release can be inhibited by stress, pain, or
anxiety, which is why relaxation is important for effective
feeding.
3. What is the primary function of colostrum?
A) Increase maternal milk supply
B) Provide early immune protection for the newborn
, C) Replace formula completely long-term
D) Prevent maternal dehydration
Answer: B) Provide early immune protection for the
newborn
Rationale: Colostrum is rich in immunoglobulins, especially
secretory IgA, which provides passive immunity to the
newborn by coating the gastrointestinal tract and protecting
against pathogens. It also contains high concentrations of
leukocytes, lactoferrin, and other immune factors.
4. Which of the following mechanisms causes oxytocin to
be released?
A) Complete delivery of the placenta
B) Elevated levels of gastrointestinal hormones
C) Frequent feeding and milk removal
D) Nipple stretching with appropriate latch-on
Answer: D) Nipple stretching with appropriate latch-on
Rationale: Oxytocin is released through neuroendocrine
reflex when the nipple is stretched and stimulated by the
infant's suckling. This triggers the posterior pituitary to
release oxytocin, resulting in the milk ejection reflex.
, 5. Lactogenesis III (maintenance of milk production)
requires which of the following to succeed?
A) Adequate rest and alternating starting breast at each
feed
B) Adequate protein and carbohydrates for the mother
C) Frequent milk removal and nipple stimulation
D) Adequate maternal hydration and lack of maternal
stress
Answer: C) Frequent milk removal and nipple stimulation
Rationale: Lactogenesis III is the maintenance phase of milk
production, which operates on a supply-demand basis.
Frequent and effective milk removal signals the breast to
continue producing milk. Without regular removal, the
Feedback Inhibitor of Lactation (FIL) accumulates and
decreases milk production.
6. What increases gastrin and decreases somatostatin in
babies?
A) Increased stress and anxiety
B) Crying before sleep
