When a positive result was limited to those with ≥ 1 PCR replicate positive for either IKZF1 or IRF4, or at least two replicates positive for BCAT1, the multi-panel test maintained a high sensitivity for CRC (131/184, 71.2%, 95% CI 64.3–77.3) and HGD adenomas (8/35, 22.9%, 95% CI 11.8–39.3, p = 0.029) but improved specificity significantly (772/820, 94.1%, 95% CI 92.3–95.6, p < 0.0001 vs. any PCR replicate positive). This evidence concerns the gene IKZF1 and adenoma.