A nurse is caring for a client who is receiving a continuous heparin infusion. Which of the following laboratory tests should the nurse review prior to adjusting the client's heparin?

Aspirate contents from the tube and verify the pH level.

• A. This is an incorrect action. Inserting air in the tube and listening for gurgling sounds in the epigastric area is not a reliable method to confirm NG tube placement, as it can produce falsepositive results due to air entering the stomach or intestines.
• B. This is a correct action. Aspirating contents from the tube and verifying the pH level is a valid method to confirm NG tube placement, as gastric contents typically have a pH of less than 5.5, while intestinal or respiratory contents have a higher pH.
• C. This is an incorrect action. Reviewing the medical record for previous x-ray verification of placement is not sufficient to confirm NG tube placement, as the tube can migrate or become dislodged after insertion. X-ray verification should be done initially and whenever there is doubt about the tube's position.
• D. This is an incorrect action. Auscultating the lungs for adventitious breath sounds is not a specific method to confirm NG tube placement, as it can indicate other conditions such as pneumonia or pulmonary edema. It can also miss signs of respiratory complications due to NG tube misplacement, such as pneumothorax or bronchial obstruction.

- A. Pink, frothy sputum is a characteristic finding of pulmonary edema, which is caused by fluid accumulation in the alveoli and interstitial spaces of the lungs. This impairs gas exchange and leads to hypoxia and respiratory distress.

- B. Bradycardia is not expected in pulmonary edema. The client is more likely to have tachycardia due to increased sympathetic stimulation and decreased cardiac output.

- C. Flushed, dry skin is not expected in pulmonary edema. The client is more likely to have pale, cool, and clammy skin due to peripheral vasoconstriction and decreased perfusion.

- D. Wheezing is not a specific finding of pulmonary edema. It may indicate bronchospasm or asthma, which are different conditions that affect the airways rather than the alveoli.