Final answer:
A nurse admitting a patient with severe diarrhea should prioritize monitoring electrolyte levels to address potential imbalances and dehydration, which is indicated by a blood test.
Step-by-step explanation:
The priority for a nurse admitting a patient with severe diarrhea to an acute medical unit would be to monitor electrolyte levels. This is crucial because chronic diarrhea can lead to significant electrolyte imbalances and dehydration. A blood test in such a situation would likely reveal abnormalities in electrolytes such as sodium, potassium, and bicarbonate levels, as well as signs of dehydration. Additional steps, such as administering intravenous fluids, might be necessary to correct the dehydration and electrolyte imbalances, ensuring the patient's safety and stabilizing their condition before further treatment options are considered.