For 10 points, name this compound that is an important indicator of renal function and is produced during the breakdown of creatine phosphate.
This compound is quantified in an assay in which it reacts with picric acid in an alkaline medium to form a complex with a lambda max of 520 nanometers. A cysteine protease inhibitor coded by the CST3 gene is an alternative for this compound in its most important function. Values of 30 milligrams per gram or higher for the ratio of microalbumin to this compound are an indication of microalbuminuria. A correction factor of 0.85 for females, or several age-dependent factors, are used in two distinct formulas to calculate the elimination of this compound. The Schwartz and Cockcroft-Gault formulas use this compound's serum level in the denominator, and the elimination of this compound is used as a proxy for the glomerular filtration rate. It is produced by the catabolism of a compound used to replenish ATP during rapid muscle contraction. For 10 points, name this compound that is an important indicator of renal function and is produced during the breakdown of creatine phosphate.
This compound is quantified in an assay in which it reacts with picric acid in an alkaline medium to form a complex with a lambda max of 520 nanometers.
serum creatINine [accept "creatINine clearance"; do not accept or prompt on "creaTINE" or "phosphocreaTINE"]