Measurement of glomerular filtration rate (GFR) is crucial in assessing kidney function status. Estimating GFR using clearance methodologies is cumbersome, as plasma and urinary concentrations and timed urine collections are required. Recently, a transcutaneous sensor has been developed whereby the rate of renal washout of a fluorescent marker administered intravenously allows calculation of GFR. The challenge is to ensure that the values of GFR obtained using the washout approach are in accord with those obtained conventionally.
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