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Test Code RENBX Renal Biopsy

Important Note

Consultation with a pathologist is advised prior to collection

Additional Information

Consultation with renal pathologist required

Specimen Required

Renal cortex

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.

Specimen Volume

Three 18 gauge needle cores of renal cortex

Minimum Specimen Volume

Each core should have at least 5 glomeruli

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


Light microscopy, immunofluorescence and electron microscopy

Turnaround Time

2 - 7 days depending on additional studies

CPT Code

88305, 88313, 88346, 88348