Correct Answer: A

Rationale: A hepatitis B screen is performed to identify antigens in maternal blood. If antigens are present, it indicates that the mother is a carrier, and the newborn will need to receive hepatitis immune globulin and vaccine soon after birth to prevent transmission. Therefore, choice A is correct. Choices B and C are incorrect because the presence of antigens indicates a positive result, not a negative one or the absence of hepatitis B in the mother. Choice D is incorrect as it suggests the client needs to receive the hepatitis B series of vaccines, which is not the immediate action required when antigens are found in the maternal blood.

Correct Answer: D

Rationale: Before administering the hepatitis B vaccine to a newborn infant, the nurse must obtain parental consent. Hepatitis B vaccine is typically given at birth, 1 month, and 6 months of age. Checking the infant for jaundice, checking the temperature, and requesting a hepatitis blood screen are unnecessary in this context. Parental consent is crucial for any medical intervention involving minors.

Correct Answer: C

Rationale: Breastfed infants pass very soft, seedy, mustard-yellow stools, which is considered normal. Formula-fed infants excrete stools that are more solid and pale yellow to light brown. It is essential for the mother to understand that seedy, mustard-yellow stools are expected in breastfed infants, indicating that there is no need for concern. Monitoring for infection as the first response without other symptoms can cause unnecessary anxiety. Decreasing the number of feedings without valid reasons can lead to inadequate nutrition for the newborn. Therefore, the correct advice for the nurse to provide in this scenario is that seedy, mustard-yellow stools are normal for breastfed infants, reassuring the mother and promoting proper understanding of newborn stool characteristics.

Correct Answer: A

Rationale: When percussing a full bladder, the nurse expects to note dull sounds over the symphysis pubis. This is because a full bladder produces a flat or dull sound. Hyperresonance sounds are present with gaseous distention of the abdomen, not a full bladder. Bowel sounds are auscultated, not percussed, so hypoactive bowel sounds or an absence of bowel sounds are unrelated findings when assessing bladder distention.

Correct Answer: A

Rationale: A chemical reaction between drugs before their administration or absorption is termed a drug incompatibility. This phenomenon commonly occurs when drug solutions are mixed before intravenous administration but can also happen with orally administered drugs. Choices B, C, and D are incorrect because side effects, adverse events, and allergic responses typically occur after the drugs have been administered and absorbed, not before.