Background: We tested the hypothesis that patterns of serum creatinine concentrations (S-cr) prior to percutaneous renal biopsy (PRB) predict the utility of PRB in safely making renal diagnoses, revealing treatable disease, and altering therapy in chronic kidney disease patients.
Methods: PRB specimens (170 patients) were assigned to 1 of 5 groups: S-cr never greater than 0.11 mM for at least 6 months prior to PRB (Group 1); S-cr greater than 0.11 mM but less than 0.18 mM during the 6 months prior to PRB (Groups 2); S-cr less than 0.18 mM during the 6 months prior to PRB but greater than 0.18 mM prior to these 6 months (Group 3); S-cr greater than 0.18 mM for less than 6 months prior to PRB (Group 4); S-cr greater than 0.18 mM for more than 6 months prior to PRB (Group 5).
Results: Histopathology chronicity score (0-9) increased with increasing group number: 2.1 (Group 1); 4.4 (Group 2); 4.5 (Group 3); 5.4 (Group 4); 7.0 (Group 5). Post-PRB bleeding was more common with increasing group number. New therapy was instituted after PRB most frequently in Group 4 (62%) and least frequently in Group 5 (24%).
Conclusion: After more prolonged elevations of S-cr, PRB may be less safe and less likely to reveal treatable disease and opportunities for therapy.
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