Final answer:
In cases of uncompensated metabolic alkalosis, the usual lab values would show an increased blood pH and an increased concentration of bicarbonate (HCO3-), with no significant respiratory compensation reflected in the normal initial PCO2 levels that could rise over time.
Step-by-step explanation:
The student's question relates to what are the usual lab value changes associated with uncompensated metabolic alkalosis. In cases of uncompensated metabolic alkalosis, the typical lab value changes include an increased pH and an increased HCO3- (bicarbonate concentration). The elevated pH indicates that the blood is more alkaline than normal, while the increased bicarbonate suggests that the cause of the alkalosis is a primary increase in bicarbonate levels, which could result from a loss of acid from the body or an accumulation of bicarbonate. It's important to note that the term "uncompensated" suggests that no significant respiratory compensation has occurred to counteract the change in bicarbonate levels; thus, the PCO2 would typically initially be normal and could potentially increase as the condition persists.