Laboratory Tests

• Arterial blood gases for evaluating partial arterial pressure of carbon dioxide (Pco2) should be considered for patients in severe distress, suspected hypoventilation, or when PEF or FEV1 is 30% or less after initial treatment.

• A CBC with differential should be obtained in patients with fever or purulent sputum.

• Serum electrolytes should be obtained, because frequent P2-agonist administration may decrease serum potassium, magnesium, and phosphate.

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