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. The Peritoneal Equilibration Test (PET) is employed to assess peritoneal membrane transport function. The purpose of the test is to determine the optimal peritoneal dialysis regimen. The performance of the test, which is conducted over 4 hours, is time consuming both for the nurses and the patient. There have been studies to validate an approved short version of the original PET protocol, and all have yielded different results. We evaluated the concordance between the 1-hour, 2-hour and 4-hour (classical) test results of the fast PET. Methods. The study included 32 patients (20 males and 12 females). The patients underwent the 4-hour fast PET test, and the dialysate-to-plasma ratio of creatinine concentration (D/Pcrea) was determined. The standard deviation was added to or subtracted from the mean D/Pcrea ratios at hours 1, 2, and 4 to determine transport groups. Results. The mean age of the patients was 51.4±16.7 years. Mean D/Pcrea ratios at hours 1, 2, and 4 were 0.41±0.07, 0.54±0.10, and 0.69+0.12, respectively. There was a strong correlation between the 4-hour D/Pcrea ratio and 1-hour (r=0.756, p<0.001) and 2-hour (r=0.867, p<0.001) D/Pcrea ratios. Seventeen patients (53%) were in the same transport group at hours 1, 2, and 4. Eighteen patients (56%) at 1 hour and 24 patients (75%) at 2 hours fell into the same transport group at 4 hours. The patients that fell into different transport groups at different time points showed a shift to a lower or higher transport group. Conclusions. Two-hour fast PET gives promising results for clinical assessment purposes.

The Fast Peritoneal Equilibration Test First and Second Hour Results