Final answer:
A high blood creatinine level of 5.0 mg/dL typically implies impaired kidney function and is likely associated with an increase in other waste product concentrations, like blood urea, rather than normal levels of ammonia.
Step-by-step explanation:
A blood creatinine value of 5.0 mg/dL is an indication of impaired kidney function or kidney disease. Normally, creatinine levels in blood should range from 0.8-1.2 mg/dL for males and 0.6-0.9 mg/dL for females. Elevated creatinine levels may be associated with reduced creatinine clearance and impaired renal function. An elevated blood urea nitrogen (BUN) value often accompanies increased creatinine levels because both are waste products excreted by the kidneys. In conditions such as kidney failure, where creatinine is elevated, the urea concentration in the blood also tends to increase.
Therefore, an elevated blood creatinine value is more likely to be found with a correspondingly high blood urea level, well above the normal range (15-40 mg/dL), rather than with normal levels of other substances like ammonia (80 µg/dL).