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JOURNAL ARTICLE
VALIDATION STUDIES
Validation of a routine two-sample iohexol plasma clearance assessment of GFR and an evaluation of common endogenous markers in a rat model of CKD.
Physiological Reports 2017 May
Endogenous markers of kidney function are insensitive to early declines in glomerular filtration rate (GFR) and in rodent models, validated, practical alternatives are unavailable. In this study, we determined GFR by modeling the plasma clearance of two compounds, iohexol and inulin, and compared the findings to common endogenous markers. All plasma clearance methods of both iohexol and inulin detected a decline in renal function weeks prior to any increase in endogenous marker. Iohexol plasma clearance and inulin plasma clearance had a very high agreement and minimal bias when using 12-sample models. However, only iohexol could be accurately simplified to a two-sample, one-compartment estimation strategy. Following an IV injection of low-dose iohexol and two timed blood samples at 30 and 90 min, one can accurately approximate a complex 12-sample strategy of plasma clearance. This method is simple enough to use in routine, longitudinal analysis of larger cohort animal studies.
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