A nurse is providing care for a client who has diabetes mellitus. Which of the following laboratory findings indicates the client most likely to be diagnosed with diabetic ketoacidosis (DKA)?

A. Lower oxygen saturations of 93% to 94%: Older adults with pneumothorax may present with lower oxygen saturations as the collapsed lung leads to impaired gas exchange. Oxygen saturation levels of 93% to 94% may indicate mild hypoxemia in these clients.
B. Lower energy expenditure: Pneumothorax in older adults is more likely to result in respiratory symptoms like hypoxemia, rather than directly affecting energy expenditure.
C. Higher oxygen saturations of 98% to 99%: This is unlikely in the presence of pneumothorax, which typically causes hypoxemia due to impaired lung function. High oxygen saturation levels would not be expected.
D. Increased lung capacity: Pneumothorax causes lung collapse, which results in decreased lung capacity and is not associated with increased lung function.

A. Viscous fluid: Thick, sticky (viscous) fluid may be seen in some types of malignant effusions or with chronic inflammation, but it is not a specific indicator of infection. Its presence alone does not confirm a bacterial process.
B. Purulent fluid: Purulent fluid is cloudy or pus-like in appearance and typically indicates the presence of infection, particularly bacterial. It suggests that the pleural space is contaminated with white blood cells and pathogens, requiring further evaluation and treatment.
C. Milky fluid: Milky fluid suggests a chylothorax, which results from lymphatic obstruction or injury. While it appears abnormal, it is usually not due to infection but rather due to chyle (lymphatic fluid) accumulating in the pleural space.
D. Bloody fluid: Bloody fluid, or hemothorax, can result from trauma, malignancy, or pulmonary embolism. While it is abnormal, it does not specifically indicate infection unless accompanied by other signs such as fever or purulence.