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Patients on peritoneal dialysis have large interindividual differences in the velocity of solute equilibration between plasma and the dialysate [1]. In an attempt to standardize assessment of this variability, Twardowski et al. developed the peritoneal equilibration test (PET) [2]. In the PET solute transport after a standardized dwell of 4 h is expressed as the dialyse/plasma (D/P) concentration ratio of various solutes. D/P creatinine had a mean value of 0.65, but it ranged from 0.34 to 1.03 [3]. A similar range was reported in another study using the PET [4]. Based on D/P creatinine, patients have been divided into four transport categories: low, low average, high average, and high [3]. This categorization was based on the mean value and the standard deviation (SD). Low is less than 1 SD, low average is between the mean and –1 SD, low average is between the mean and +1 SD, and high is above 1 SD. The cut-off levels are: <0.50 for low, 0.50–0.65 for low average, 0.65–0.81 for high average, and >0.81 for high transporters. About 10% of prevalent PD patients can be classified as high transporters [5].

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Krediet, R.T. (2009). Physiology of High/Fast Transporters. In: Khanna, R., Krediet, R.T. (eds) Nolph and Gokal's Textbook of Peritoneal Dialysis. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-78940-8_7

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