exogenous creatinine clearance

ex·og·e·nous cre·at·i·nine clear·ance

a term distinguishing measurements based on infusing creatinine intravenously to raise its plasma concentration and facilitate its accurate chemical determination.
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(10) Different methods for evaluating the GFR with creatinine have been established for small animals, but only one study in birds has been published, with little detail, (8) Although the authors concluded that exogenous creatinine clearance might be a feasible method for assessing renal function in birds and described their results as promising, the research has not been published in detail and has not been reported as ongoing, (8)
The present study focused on assessing the feasibility of performing an exogenous creatinine clearance test in birds as suggested for small animals.