Open AccessEffectiveness of currently used urinary preservatives in preserving high demand biochemical analytes. A study in the context of Sri Lankan laboratory setting
Author(s) -
P. L. Hewapathirana,
H. N. G. Abeywardena,
Deepthi Inoka Uluwaduge,
N. S. Amarasinghe,
K. C. Perera,
E.M.S. Bandara
Publication year - 2021
Publication title -
international journal of kiu
Language(s) - English
Resource type - Journals
eISSN - 2719-2369
pISSN - 2719-2350
DOI - 10.37966/ijkiu2021021012
Subject(s) - preservative , urine , boric acid , context (archaeology) , chemistry , urine collection device , sodium azide , chromatography , analyte , creatinine , food science , biochemistry , biology , paleontology , organic chemistry
Analysis of 24-hour urine composition is widely used in diagnosis of acute andchronic kidney diseases. In Sri Lanka, no guidelines are available onpreservation of urine. This study aimed to identify an effective preservationtechnique/s among currently practiced techniques in laboratories to maintainchemical stability of high demand bio chemical analytes in a 24-hour urinecollection. An experimental study was undertaken using urine samples from volunteers(n=42, National Hospital of Sri Lanka and University of Sri Jayawardenepura,Nugegoda, Sri Lanka). Each sample was divided in to 10 ml aliquots; Out of thelot, one was preserved without any preservative and another refrigerated at 4ºCfor 24 hours. Other aliquots were preserved for 24-hours by addition offollowing preservatives in a 24-hour collection: boric acid g/ urine (5, 7.5, 10),sodium azide g/ urine (0.3, 0.6, 0.9), HCl ml/ urine (1N;10ml, 6N;10ml, 25mland 30ml). The aliquots with preservatives were kept at room temperature for 24hours. Protein, Creatinine, Ca2+, Mg2+ and PO43- concentrations were measured ineach aliquot. Least mean squared error for each analyte in different preservativeswas calculated. For protein and creatinine, least mean squared error was given by, 10g/L boric acid. That of Ca2+, Mg2+ and PO43 were observed when the sample wasrefrigerated or after addition of 10g/L boric acid as the preservative. Sodium azide and HCl that are utilized in current practice as preservatives for 24-hour urine collections do not show better performance in selected analytes. Boric acid (10g/L) is more effective in persevering protein and creatinine. Due to practical issues in acquiring refrigeration facilities, Ca2+, Mg and PO4 3- also can be preserved effectively by using the same preservative. Consequently, Boric acid (10g/L) could be recommended as an effective preservative to preserve selected analytes in 24-hour urine collection