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Test Code RENBX Renal Biopsy

Important Note

Consultation with a pathologist is advised prior to collection.

Specimen Required

Renal cortex

Specimen Volume

Three 18 gauge needle cores of renal cortex

Minimum Specimen Volume

 Each core should have at least 5 glomeruli

Special Handling Instructions

One core renal cortex in Zeus fixative, one core renal cortex in 10 % neutral buffered formalin, one core renal cortex in glutaraldehyde solution. Alternatively, tissue may be submitted wrapped in saline soaked gauze, placed in a container with crushed ice and transported immediately to the EM lab.

Transport Temperature

In fixative or on ice

Specimen Stability

Transport specimen to the EM laboratory within 2 hours

Reasons for Rejection

Mishandling of specimen during collection and processing, such as frozen, dried out, or exposed to extreme heat. 

Turnaround Time

2-7 days depending on additional studies

Day(s) and Time(s) Performed

Mon-Fri, 8AM- 1:00 PM; not available on weekends or holidays

CPT Codes

88305, 88313, 88346, 88348


Light microscopy, immunofluorescence and electron microscopy

Additional Information

Consultation with renal pathologist required