PERCIST

PET Response Criteria in Solid Tumors

Current: PERCIST 1.0 (2009)Wahl et al.
Whole body (oncology)PET / SPECT

PERCIST is the metabolic counterpart to RECIST, defining tumor response on FDG-PET using quantitative uptake (SUL peak) rather than size alone. It categorizes complete, partial, stable, and progressive metabolic response based on percentage change in a standardized-uptake measure, capturing treatment effects that anatomic shrinkage can miss or lag. It is the reference radiologists and nuclear-medicine physicians reach for when a report needs to speak “metabolic response,” and it is frequently contrasted head-to-head with RECIST.

Version history & what changed

  1. PERCIST 1.02009Current

    Defined metabolic response on FDG-PET by percentage change in SUL peak (CMR/PMR/SMD/PMD), the quantitative metabolic counterpart to RECIST.

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Written by RadPigeon Editorial Team, Radiology news editorial teamMedical review pending
Last reviewed: 1 Jul 2026Last changed: 1 Jul 2026

RadPigeon is an independent radiology news digest and is not affiliated with or endorsed by Wahl et al.. “PERCIST” is a trademark of its owner and is named here only to refer to the system. Always consult the official source for the exact, current criteria.