A nurse is reviewing the medication administration record for a client who has cancer and is receiving morphine via a PCA pump. Which of the following prescriptions should the nurse clarify with the provider?

A) WBC count: Filgrastim is a granulocyte colony-stimulating factor (G-CSF) medication used to stimulate the production of white blood cells (WBCs), particularly neutrophils, in individuals with neutropenia. Therefore, monitoring the WBC count is essential to evaluate the effectiveness of filgrastim therapy. An increase in WBC count indicates a response to treatment, helping to prevent or manage neutropenic complications such as infections.

B) INR: The international normalized ratio (INR) is a laboratory test used to monitor the effectiveness of anticoagulant therapy, particularly warfarin (Coumadin). It measures the clotting ability of the blood and is not directly related to filgrastim therapy. Therefore, monitoring the INR is not appropriate for evaluating the effectiveness of filgrastim treatment.

C) BUN: Blood urea nitrogen (BUN) is a laboratory test used to assess kidney function and hydration status. It measures the concentration of urea nitrogen in the blood and is not directly related to filgrastim therapy. Monitoring BUN levels may be indicated for assessing renal function in certain clinical contexts but is not specific to evaluating the effectiveness of filgrastim treatment.

D) Potassium level: Monitoring potassium levels is important for assessing electrolyte balance and kidney function but is not directly related to filgrastim therapy. Potassium levels may be affected by various factors, including medications, diet, and renal function. However, they do not directly reflect the effectiveness of filgrastim in stimulating WBC production.

A) Ask another nurse if they are aware of potential interactions: Relying solely on another nurse's awareness of potential interactions is’not a comprehensive or reliable approach. Nurses may have varying levels of knowledge about medication interactions, and it's important to consult verified sources ’or accurate information.

B) Check the client's medical record for medication and food’interactions: While the client's medical record may contain information’about their current medications, it may not provide detailed information about potential interactions with specific foods or other medications. Additionally, relying solely on the medical record may not capture recent changes in medication or dietary intake.

C) Consult a drug reference guide for possible interactions: This is the correct action. Drug reference guides provide comprehensive information about medications, including potential interactions with other drugs and food. Nurses can access reliable drug reference guides to ensure they have accurate information before administering medications.

D) Have the client take the medication on an empty stomach to avoid interactions: Instructing the client to take medication on an empty stomach without knowledge of specific interactions could be inappropriate and potentially harmful. Some medications require administration with food to enhance absorption or reduce gastrointestinal side effects. It's essential to consult reliable sources ’o determine the appropriate administration instructions for each medication.