Otherwise, if furnace flue is being abandoned because no longer needed, I would require the top be removed and replaced with a domed galvanized metal cap to keep insects and maybe rodents from taking up residence or using it as a nut cache - cost probably about $50-75 additional.
The creatinine levels in both urine and blood are determined and compared. Normal creatinine clearance for healthy women is 88-128 mL/min. and 97 to 137 mL/min. in males (normal levels may vary slightly between labs). Blood urea nitrogen (BUN) level is another indicator of kidney function.
It enters the bloodstream and is filtered by the kidneys to get excreted through the urine. A blood creatinine test will measure the amount of creatinine in your blood. A higher level (greater than 0.8-1.2 mg/dl in men and 0.6-0.9 mg/dl in women) may indicate that the kidneys are not functioning properly. 3. Blood urea test: Urea is a waste product filtered by the kidneys and excreted through the urine.