My furnace worked well for about 6 years. At that point I noticed an awful, propane-like smell (I'm on natural gas) from the exhaust outside my home. During my annual maintenance, the technician noted the heat exchangers were going bad.
Blood urea nitrogen (BUN) measures the amount of urea nitrogen in bloodstream. Urea is formed in liver as the end product of protein metabolism and digestion. Urea is transported to the kidneys for excretion. A normal range for blood urea nitrogen is generally 8 to 24 mg/dl for adult males and 6 to 21 mg/dl for females.Generally, a high blood urea nitrogen level means that the kidneys are not performing well, particularly if the result is above 50mg/dl.n adult men, normal range of serum creatinine is 0.9-1.3mg/dl; while in adult women, normal range of creatinine is 0.6 to 1.1mg/dl. A muscular young man will have a higher normal creatinine result than the senior people with poorer health conditions.
Normal creatinine ranges from 0.5-1.1 mg/dl for female and 0.6-1.2 mg/dl for male. People with one kidneys have a higher creatinine level that is 1.8-1.9 mg/dl. This is the general standard for elevate renal function.