An Older Patient with a Colostomy Was Admitted for Weakness,nausea,vomiting,and

An older patient with a colostomy was admitted for weakness,nausea,vomiting,and loose stools.Which action should the nurse take first to determine the effectiveness of this patient's care?

A) Weigh the patient.
B) Measure urine specific gravity.
C) Check a pulse oximetry reading.
D) Determine the creatinine clearance.