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.
Creatinine is a useful indicator of renal health because it is excreted in the urine as an unchanged and easily measured by-product of muscle metabolism. In a healthy kidney, little or no creatinine is reabsorbed, whereas in kidney disease, the creatinine concentration in the blood may increase. The creatinine concentration in the urine and blood can therefore be used to calculate the rate at which the kidney is clearing creatinine â the creatinine clearance (CrCl) rate. This CrCl rate is correlated with the glomerular filtration rate (GFR), which is important in the clinical assessment of renal function.