The 82-year-old patient presents to the emergency department with chest pain that started four hours ago. Vascular access is a challenge and the nurse is only able to draw enough blood for one test. The nurse sends the sample to the lab for which test?

The patient with metabolic acidosis is determined to have an anion gap of 11 mmol/L. The nurse advocates for which additional lab test?

The nurse is attempting to interpret the arterial blood gas results of an adult male patient with metabolic acidosis who has a bicarbonate (HCO3-) level of 18. Using the Winter formula, determine the expected pCO2 that would indicate this patient is compensating for the metabolic acidosis. Enter your answer using a whole number.