Tailoring the sampling time of single-sample GFR measurement according to expected renal function: a multisite audit.

Background: The 2018 BNMS Glomerular Filtration Rate (GFR) guidelines recommend a single-sample technique with the sampling time dictated by the expected renal function, but this is not known with any accuracy before the test. We aimed to assess whether the sampling regime suggested in the guidelines is optimal and determine the error in GFR result if the sample time is chosen incorrectly. We can then infer the degree of flexibility in the sampling regime.

Accuracy of next-day single-sample measurement for low glomerular filtration rate and comparison with same-day slope-intercept glomerular filtration rate.

Aim: We aimed to investigate the accuracy of a single-sample glomerular filtration rate (SS-GFR) technique with a sample taken at 24 h post-injection for patients with GFR lower than 25 mL/min/1.73 m2. A comparison with the results from same-day slope-intercept GFR (SI-GFR) was also performed.