ANSWER.
* Gas exchange related to pneumonia as evidenced by changes in chest X-ray
is not a vaild diagnosis.
* Because it fail to explain the potential health problem of this patient.
* A valid nursing diagnosis consists of a Problem,Etiology and Defining
characterstics.
* Problem indicate the potential helath problem of the patient.
* Etiology indicate the cause of potential health problem.
* Defining characterstics is the evidence which support the problem is present.
So the valid nursing diagnosis is
* Impaired gas exchange (Problem) related to pneumonia (Etiology) as evidenced
by changes in the chest X-ray (Defining characterstics).
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