A nurse is preparing to administer morphine 8 mg IV intermittent bolus to a client. The amount available is morphine 10 mg/mL. How many mL should the nurse administer?
(Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

A. Urinary retention: While urinary retention can be a side effect of meperidine and other opioids, it is not the priority assessment before administering the medication. Urinary retention is a concern but is not immediately life-threatening compared to other potential side effects of opioids, such as respiratory depression. Assessing urinary retention is important, but it is not the primary concern in this situation.

B. Vomiting: Vomiting can also be a side effect of opioids, including meperidine. While it is essential to assess for vomiting and its potential impact on the client's overall condition, it is not the priority assessment before administering the medication. Vomiting can be managed, and the nurse should address it as needed. However, the priority assessment is one that can affect the client's immediate safety and well-being, such as respiratory rate and potential respiratory depression.

C. Respiratory rate: This is the correct answer. The priority assessment before administering meperidine is the client's respiratory rate. Opioids can cause respiratory depression, leading to reduced breathing and inadequate ventilation. Monitoring the respiratory rate allows the nurse to detect any signs of respiratory distress or inadequate breathing, enabling them to intervene promptly to prevent serious complications.

D. Level of consciousness: While assessing the client's level of consciousness is essential for overall assessment and monitoring, it is not the priority assessment before administering meperidine. Respiratory depression due to opioid use can occur even when the client is conscious. However, if respiratory depression occurs, it can lead to a decrease in consciousness and potentially unconsciousness, making the assessment of respiratory rate more critical to prevent such complications.

Before administering the first dose of metformin, the nurse should evaluate the client's creatinine level. Metformin is primarily excreted by the kidneys, and its clearance from the body depends on the renal function. If the client has impaired kidney function, metformin can accumulate in the body and lead to potential adverse effects, particularly lactic acidosis.

Monitoring the creatinine level helps assess the client's kidney function and determines whether it is safe to administer metformin. If the creatinine level is elevated, indicating reduced kidney function, the nurse should consult with the healthcare provider to determine the appropriate dose adjustment or consider an alternative treatment option.

Let's go through the other options and explain why they are not the priority laboratory results to evaluate before administering metformin:

A. Potassium level: While monitoring potassium levels is important in some situations, it is not a primary concern before administering metformin. Metformin does not have a significant effect on potassium levels, and it is not a medication known for causing hypokalemia (low potassium levels).

C. Platelet count: Metformin does not have a direct impact on platelet count, and evaluating platelet count is not typically required before starting metformin therapy. Platelet count monitoring may be relevant for certain other medications or medical conditions, but it is not specific to metformin administration.

D. Liver enzymes: While it is essential to monitor liver function in clients on long-term metformin therapy, evaluating liver enzymes before the first dose of metformin is not the priority. Metformin is primarily cleared by the kidneys, and liver enzymes are not directly affected by its initial administration. However, ongoing monitoring of liver function may be necessary during long-term