In order to evaluate a patient's acid-base balance,the primary provider has prescribed diagnostic tests to measure pH,PCO₂,and HCO₃ - .The nurse realizes that the patient will: A) Have a venous blood sample drawn B) Have an arterial blood sample taken C) Need to provide a fresh voided urine sample D) Need to provide a 24-hour urine sample

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Evaluation of serum pH,PCO₂,and HCO₃- requires a sample of arterial blood.It is possible to measure the pH in the urine,but not the other values.Venous blood provides diagnostic information on the various electrolytes (e.g.,sodium,potassium),BUN,creatinine,and hematocrit.Venous bicarbonate can be measured,as well.

In Order to Evaluate a Patient's Acid-Base Balance,the Primary Provider