The nurse is assigned a 2-year-old patient who has severe periumbilical abdominal pain and hematochezia. On exam, a palpable mass is found in the right upper quadrant. Which of the following diagnostic tests would most likely confirm the diagnosis?

The 49-year-old patient presented with a breast lump found during her monthly breast self-exam. This is confirmed on mammogram; the lump was biopsied and found to be an adenocarcinoma that is HER2/neu negative. The patient requests that interventions conserve as much of her breast tissue as possible. The nurse prepares the patient for which next step in management?  

The nurse is reviewing the lab results of a patient in the intensive care unit and finds the patient’s lactate to be 5.4 mmol/L. Which additional value is most responsible for this value?