A patient with chronic obstructive pulmonary disease (COPD)has increasing dyspnea and is being evaluated for heart failure (HF).Which test will be ordered to help differentiate between dyspnea due to lung dysfunction and dyspnea due to HF?

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The BNP is used to differentiate that dyspnea is due to HF and not lung dysfunction.The other tests will all be a part of the diagnostic workup but do not help with this distinction.

A Patient with Chronic Obstructive Pulmonary Disease (COPD)has Increasing Dyspnea