In infants, the plantar grasp reflex should disappear by age:
3 months.
4 months.
8 months.
12 months.
The Correct Answer is C
Rationale:
A. By 3 months, the plantar grasp reflex may still be present; disappearance occurs later.
B. At 4 months, the reflex is gradually fading but not fully absent in all infants.
C. The plantar grasp reflex, in which the infant curls the toes when the sole of the foot is stroked, typically disappears by around 8 months of age as voluntary control over the toes develops.
D. By 12 months, the reflex is expected to be fully absent, and persistence beyond this age may indicate neurologic abnormalities.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Rationale:
A. The appearance of downy pubic hair occurs after the initial signs of puberty and typically represents Tanner stage 2–3 development.
B. Enlargement and lengthening of the penis usually occur after testicular enlargement, often a few months later, as puberty progresses.
C. Axillary and facial hair develop in later stages of puberty and are not initial indicators of sexual maturation in males.
D. Enlargement of the testicles and scrotum is the first and most reliable sign of puberty in males, generally occurring between ages 9 and 14. Testicular growth reflects activation of the hypothalamic-pituitary-gonadal axis, leading to increased testosterone production and the subsequent development of secondary sexual characteristics. Monitoring testicular size is therefore a key component in assessing the onset and progression of male puberty.
Correct Answer is B
Explanation
Rationale:
A. A capillary lead level of 15 μg/dL is above the reference level of concern; it is not considered normal, so rescreening in a year is inappropriate.
B. Capillary (fingerstick) lead measurements can be affected by contamination and are used for initial screening. Elevated results should always be confirmed with a venous blood sample before taking further action.
C. Chelation therapy is reserved for significantly elevated venous lead levels (typically ≥45 μg/dL in children); it is not indicated at this stage without confirmation.
D. Home inspection for lead contamination is important if elevated lead levels are confirmed, but the first step after an abnormal capillary reading is to confirm with a venous sample.
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