Pulmonary edema laboratory tests

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Laboratory Findings

Brain Natriuretic Peptide

B-type natriuretic peptide (BNP) is elevated in the patient with cardiogenic pulmonary edema. A low BNP (<100 pg/ml) makes a cardiac cause very unlikely and is associated with non-cardiogenic pulmonary edema.

Oxygen Saturation

Low oxygen saturation or hypoxia may be present on arterial blood gas readings.