A nurse is reviewing the BUN result of a client who is taking cyclosporine following a kidney transplant. Which of the following laboratory studies should the nurse recognize as another renal function study that should be monitored?

Choice A reason: Decreasing fluid intake to firm stools is incorrect, as adequate hydration (2-3 L/day) is essential to prevent constipation, especially with opioids like oxycodone, which slow intestinal motility. Low fluid intake hardens stools, exacerbating constipation risk by reducing water content in the colon, indicating a misunderstanding of prevention strategies.
Choice B reason: Increasing dietary fiber intake (25-35 g/day) adds bulk to stools, stimulating peristalsis and counteracting opioid-induced slowed motility. Soluble and insoluble fiber, found in fruits, vegetables, and whole grains, promotes regular bowel movements. This statement reflects correct understanding of dietary measures to prevent constipation during opioid therapy.
Choice C reason: Taking a laxative only when constipated is reactive, not preventive. Opioids like oxycodone commonly cause constipation by reducing peristalsis via mu-opioid receptors in the gut. Prophylactic use of stool softeners or laxatives is recommended to maintain regular bowel movements, making this statement incorrect as it lacks a preventive approach.
Choice D reason: Exercising less to conserve energy worsens constipation, as physical activity stimulates intestinal motility, countering opioid-induced slowing. Regular movement, like walking, promotes bowel function by enhancing peristalsis and blood flow to the gut. This statement indicates a misunderstanding, as reduced activity increases constipation risk.

Choice A reason: Percussion precedes palpation to assess abdominal resonance and organ size without altering bowel motility. Performing it last risks inaccurate findings, as palpation may stimulate peristalsis, changing resonance patterns. This sequence ensures reliable detection of abnormalities like organomegaly or fluid accumulation in the abdomen.
Choice B reason: Auscultation is done before palpation to capture natural bowel sounds. Manipulation during palpation can alter peristalsis, affecting auscultatory findings. Early auscultation ensures accurate detection of hypoactive or hyperactive bowel sounds, critical for diagnosing conditions like ileus or obstruction in abdominal assessments.
Choice C reason: Palpation is the final step, following inspection, auscultation, and percussion, to assess for tenderness or masses. This sequence prevents manipulation from altering earlier findings, ensuring accurate identification of abdominal abnormalities like peritonitis or organ enlargement, critical for a comprehensive physical examination.
Choice D reason: Inspection is the first step, providing a visual baseline of abdominal appearance, such as distension or scars. Performing it last misses initial cues guiding subsequent steps. Early inspection ensures no manipulation affects visual assessment, vital for identifying external signs of underlying abdominal pathology.