Final answer:
The most essential question to ask before performing a metabolic panel is the (a) last time the patient ate, as fasting status directly impacts test accuracy for glucose and lipid levels. Medication use is also a critical factor to consider for proper interpretation of results.
Step-by-step explanation:
The most important question to ask prior to collecting a metabolic panel is 'When was the last time you ate?' This question is crucial because most metabolic panels require the patient to fast for an accurate assessment of components such as glucose and lipid levels. Understanding when the patient last consumed food helps ensure that the test results are valid, and it can prevent the need for a retest due to recent food intake that can alter metabolic markers.
Additionally, asking about medication ('Do you take any meds?') is also important, as certain drugs can influence metabolic processes and should be taken into account when interpreting test results. While the other questions may provide helpful health context, knowing the fasting status and medication use directly impacts the accuracy and interpretation of the metabolic panel results.