Eileen, we use commercially-prepared Michel's Transport Medium from Newcomer Supply.  The renal biopsy is placed in this solution when taken and sent to our laboratory.  Then we wash the specimen in Newcomer Supply's Michel's Buffered Wash Solution, for 3 x 10 minute washes (30 minutes total) and freeze the biopsy in OCT and cut for immunofluorescence.  We've had very few preservation problems using these solutions.
 
Eric Gagnon MLT
Histology Laboratory
Kingston General Hospital
Kingston, Ontario, Canada


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