What BUN level is expected for a dehydrated client upon admission?

In cases of dehydration, the blood urea nitrogen (BUN) level often increases due to a reduced fluid volume in the body. When a client is dehydrated, the kidneys conserve water, leading to a higher concentration of urea in the blood. A BUN level of 35 mg/dL typically indicates moderate dehydration and reflects the body's response to conserve water, enhancing the reabsorption of urea. This level is indicative of an imbalance caused by a decreased fluid intake or increased fluid loss, which is common in clinical scenarios presenting with dehydration.

Lower BUN levels can suggest adequate hydration or less severe dehydration, while much higher levels, such as 45 mg/dL, may indicate more severe dehydration or other underlying renal issues. The choice of 20 mg/dL is generally considered within a normal range and unlikely for a dehydrated client, and 25 mg/dL is also on the lower side to represent significant dehydration. Thus, a BUN level of 35 mg/dL is the most appropriate level expected for a dehydrated client upon admission.