A nurse is preparing to administer the measles, mumps, and rubella (MMR) vaccine to an adolescent. Which of the following should the nurse identify as a contraindication to administering this vaccine?

Choice A rationale:
This medication can cause ringing in the ears (Choice A) is not a common side effect of amoxicillin. Ringing in the ears (tinnitus) is not typically associated with the use of this antibiotic.
Choice B rationale:
This medication can cause muscle pain (Choice B) is not a common side effect of amoxicillin. Muscle pain is not among the usual adverse reactions associated with its use.
Choice C rationale:
This medication can cause loose stools (Choice C) is a relevant side effect of amoxicillin. Antibiotics, including amoxicillin, can disrupt the normal balance of gut bacteria, potentially leading to gastrointestinal disturbances such as diarrhea or loose stools.
Choice D rationale:
This medication can cause blurred vision (Choice D) is not a common side effect of amoxicillin. Blurred vision is not a typical adverse effect associated with the use of this antibiotic.

Choice A rationale:
Hct 45% (Choice A) refers to the hematocrit level, which measures the proportion of blood volume occupied by red blood cells. While dehydration can lead to elevated hematocrit due to hemoconcentration, a hematocrit value of 45% is within the normal range for both males and females. Dehydration might cause a mild increase, but more significant elevations would be expected in cases of severe dehydration.
Choice B rationale:
Urine specific gravity 1.035 (Choice B) is an indicator of concentrated urine, which is a characteristic finding in dehydration. Dehydration reduces the body's water content, leading to more concentrated urine with higher specific gravity values. A normal range for urine-specific gravity is typically between 1.005 and 1.030.
Choice C rationale:
Capillary refill of less than 2 seconds (Choice C) is not a finding consistent with dehydration. Capillary refill time measures the time it takes for color to return to the nailbed after pressure is applied. Prolonged capillary refill time might indicate poor peripheral perfusion, which can be a sign of dehydration, but a refill time of less than 2 seconds is considered within the normal range.
Choice D rationale:
A urine output of 35 ml/hr (Choice D) is not indicative of dehydration. In fact, a urine output of 35 ml/hr is relatively normal and suggests adequate fluid intake and hydration. Dehydration would typically result in reduced urine output as the body conserves water.