Do not let time-zero histology alone decide to discard a deceased-donor kidney

Design

Systematic review and meta-analysis, GRADE-rated

Population

203 reports on pre-implantation biopsy in adult deceased-donor kidneys

Primary outcome

Prognostic association, incremental prediction and clinical utility

Effect

Vascular injury–graft failure HR 1.48 (1.07 to 2.04); all 12 estimates very low certainty

This systematic review and meta-analysis, published 12 September, screened more than 25,000 records and included 203 reports on pre-reperfusion biopsy in adult deceased-donor kidney transplantation, keeping prognostic association, incremental prediction, clinical utility and reproducibility separate. Its conclusion is direct: current evidence does not support time-zero histology as a stand-alone rule for accepting or discarding a kidney.

Vascular injury was associated with delayed graft function (OR 1.85, 95% CI 1.11 to 3.06) and graft failure (HR 1.48), and glomerulosclerosis with graft failure (HR 2.03, 1.22 to 3.39) but not clearly with delayed graft function (OR 1.13, 0.59 to 2.17). All twelve pooled estimates were very low certainty. Crucially, no body of evidence showed that histology adds predictive value beyond established donor and recipient variables, or that biopsy-guided decisions improve outcomes. Reproducibility of the histological scoring is itself a concern.

For pathologists, the practical change is in how reports are framed and used: as a standardised description with adequacy stated, fed into a joint decision with the transplant team, rather than a numerical threshold that triggers discard. Organ shortage makes the cost of an unnecessary discard high.

• Frame donor biopsy reports as one input to the transplant decision, not a pass/fail result.
• Avoid single percentage cut-offs of glomerulosclerosis as automatic discard triggers.
• Use a standard scoring scheme and state adequacy so findings are comparable.
• Discuss borderline biopsies directly with the transplant surgeon rather than by report alone.

Why it matters

Challenges a long-standing reliance on biopsy thresholds that may be discarding transplantable kidneys.

Don't overread it

The review does not show biopsy is useless — only that it has not been shown to add value alone.

The statistics, in plain English

Very low certainty on every pooled estimate means further research is very likely to change them. An association with outcome does not mean the biopsy improves the decision.

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