Background: Serum lactate dehydrogenase (LDH) levels may help to distinguish ischemic acute tubular necrosis (ATN) from acute rejection after kidney transplantation.
Methods: All kidney biopsies performed in the years 2010 to 2012 were reviewed. Serum LDH, creatinine level, clinical variables, and presence of donor-specific antibodies were recorded before the biopsy.
Results: Overall 150 biopsies were included. Ischemic ATN was diagnosed in 45 biopsies and acute cellular-mediated rejection and/or antibody-mediated rejection in 59 biopsies, 38 of which were accompanied by ATN. Serum LDH was elevated in 23 (51%) of 45 cases with ischemic ATN versus 15 (14%) of 105 cases with other diagnoses ( P < .0001). Median serum LDH was 478 U/L (range 277-2018) for ischemic ATN and 372 U/L (range 191-748) for all other diagnoses ( P < .001). When delayed graft function or primary nonfunctioning grafts were caused by ischemic ATN, serum LDH was elevated in 58% of cases, but when caused by acute rejection, LDH was normal in 88% of cases ( P = .02).
Conclusions: There is a strong association between elevated serum LDH 1 to 3 days before performing kidney biopsy and the diagnosis of ischemic ATN after kidney transplantation, especially at the immediate posttransplantation period. Normal serum LDH at this period should raise a suspicion of acute rejection.
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