The nurse examines a client's right great toe. The joint is red, edematous, and very painful with limited range of motion. The client's serum uric acid levels are elevated. Which action should the nurse tell the client to make?

Choice A Reason:
White blood cell count (WBC) is inappropriate. White blood cell count is typically monitored to assess for signs of infection or inflammation. While it's important to monitor WBC count in certain situations, such as suspected infection, melena itself is not directly indicative of an increased risk of infection. Therefore, monitoring WBC count may not be the most immediate response to the finding of melena.
Choice B Reason:
Glucose is inappropriate. Glucose monitoring is essential for patients with diabetes or those at risk of hypoglycemia or hyperglycemia. However, melena is not directly related to glucose metabolism or regulation. Therefore, monitoring glucose levels would not be the most relevant response to the finding of melena.
Choice C Reason:
Blood urea nitrogen (BUN) is inappropriate. Blood urea nitrogen is often monitored to assess kidney function and hydration status. While severe bleeding can potentially lead to hypovolemia and prerenal azotemia (elevated BUN due to decreased renal perfusion), monitoring BUN would not be the immediate response to the finding of melena. Instead, assessing for signs of hypovolemia and monitoring other markers of blood loss, such as hematocrit, would be more appropriate.
Choice D Reason:
Hematocrit is appropriate. Melena refers to the passage of black, tarry stools containing blood that has been digested. It indicates upper gastrointestinal bleeding, typically from the stomach or upper small intestine. Monitoring the hematocrit level is important because significant bleeding, as indicated by melena, can lead to a decrease in the hematocrit level due to the loss of red blood cells and plasma volume. Monitoring the hematocrit helps assess the severity of the bleeding and guides treatment decisions, such as the need for blood transfusions. Therefore, the nurse should monitor the hematocrit level in response to the finding of melena.

Choice A Reason:
Coronary heart disease is incorrect. Coronary heart disease is primarily associated with cardiovascular symptoms such as chest pain, shortness of breath, and fatigue. While some nail changes may occur in individuals with coronary heart disease due to decreased oxygenation, brittle, concave nails are not a typical manifestation of this condition. Therefore, this option is less likely to explain the appearance of the nails.
Choice B Reason:
Iron deficiency anemia is correct. Iron deficiency anemia is characterized by a lack of iron in the body, leading to decreased production of hemoglobin and red blood cells. One of the classic nail findings associated with iron deficiency anemia is koilonychia, which presents as brittle, concave nails with a spoon-like appearance. This is due to structural changes in the nails caused by the deficiency of iron. Therefore, this option is the most likely explanation for the observed nail changes.
Choice C Reason:
Diabetes mellitus is incorrect. Diabetes mellitus can lead to various dermatologic manifestations, including nail changes such as thickening, discoloration, and slow nail growth. However, brittle, concave nails with a spoon-like appearance are not typically associated with diabetes mellitus. Therefore, while diabetes mellitus may affect the nails, it is less likely to explain the specific appearance observed in this case.
Choice D Reason:
Recent candida infection is incorrect. Candida infections, particularly in the nail folds (paronychia), can lead to changes in the nails such as discoloration, thickening, or separation from the nail bed. However, brittle, concave nails with a spoon-like appearance are not typical findings of candida infections. Therefore, while recent candida infection may affect the nails, it is less likely to explain the specific appearance observed in this case.