A client with a history of atrial fibrillation is prescribed warfarin. Which laboratory value should the nurse monitor to assess the medication’s effectiveness?

Choice A reason: Anorexia is common in hepatitis due to systemic inflammation but is nonspecific, occurring in many conditions. Clay-colored stools directly indicate impaired bile excretion from liver dysfunction, a hallmark of hepatitis, making it a more diagnostic finding.

Choice B reason: Clay-colored stools are highly indicative of hepatitis, as liver inflammation impairs bile production or excretion, reducing bilirubin in feces. This causes pale stools, reflecting hepatic dysfunction, making it a key finding to confirm hepatitis over nonspecific symptoms like anorexia.

Choice C reason: Brown, foamy urine is not typical of hepatitis. Dark urine from bilirubinuria may occur, but foamy urine suggests proteinuria, unrelated to liver dysfunction. Clay-colored stools are more specific, indicating bile flow obstruction, a direct sign of hepatitis pathology.

Choice D reason: Hematemesis indicates gastrointestinal bleeding, not a primary hepatitis feature. While advanced liver disease may cause variceal bleeding, clay-colored stools are an earlier, more specific sign of hepatitis-related bile impairment, making them the priority finding in acute cases.

Choice A reason: A foreign body in the eye may cause irritation or damage but is not a contraindication for ketorolac, a nonsteroidal anti-inflammatory drug (NSAID) used for pain and inflammation. The nurse would ensure removal of the foreign body first, but ketorolac can be used post-removal if indicated.

Choice B reason: Radiation exposure, such as from UV light, may cause photokeratitis but is not a specific contraindication for ophthalmic ketorolac. The medication reduces inflammation and pain, which may be beneficial in such cases. The nurse should assess for other ocular conditions, but radiation exposure alone does not preclude its use.

Choice C reason: Chemical burns require immediate irrigation and specific treatments based on the chemical involved. Ketorolac may reduce pain and inflammation post-irrigation, but it is not contraindicated. The nurse should prioritize burn management, but chemical burns do not inherently prohibit ketorolac use compared to corneal abrasions.

Choice D reason: Corneal abrasions are a contraindication for ophthalmic ketorolac, as NSAIDs can delay corneal healing and increase the risk of complications like corneal ulceration. The nurse must review the medical record to confirm the absence of abrasions, as ketorolac is typically used for postoperative pain, not traumatic corneal injuries.