{"id":"W4414740787","doi":"10.1093/clinchem/hvaf086.662","title":"B-275 The Evolving Illicit Opioid Landscape: Insights into Fentanyl Analogs Para-Fluorofentanyl and Ortho-Methylfentanyl","year":2025,"lang":"en","type":"article","venue":"Clinical Chemistry","topic":"Opioid Use Disorder Treatment","field":"Medicine","cited_by":0,"is_retracted":false,"has_abstract":true,"ca_institutions":"PolicyWise for Children & Families","funders":"","keywords":"Fentanyl; Urine; Immunoassay; Drug; Opioid; Illicit drug; Potency","routes":{"ca_aff":true,"ca_fund":false,"ca_venue":false,"about_ca":false,"invisible_to_affiliation_only":false},"retraction":null,"screen":null,"direct_labels":[],"prediction":{"model_version":"codex-gemma-dda1882f352a","candidate_categories":["metaepi_narrow"],"consensus_categories":[],"category_scores_codex":[0.0003867343,0.0003822182,0.0007088249,0.0000505206,0.0002623238,0.00006875369,0.0002945452,0.0003730562,0.0002967915],"category_scores_gemma":[0.0006729319,0.0002624613,0.0003181804,0.0004172994,0.0003949119,0.00007701836,0.0002918741,0.0007551264,0.0000572433],"about_ca_system_candidate":false,"about_ca_system_consensus":false,"about_ca_system_score_codex":0.0001206284,"about_ca_system_score_gemma":0.0002916665,"about_ca_topic_candidate":false,"about_ca_topic_consensus":false,"about_ca_topic_score_codex":0.00003484425,"about_ca_topic_score_gemma":0.00001701057,"domain_scores_codex":[0.997449,0.00009008678,0.0009233367,0.0007854362,0.000345697,0.0004063929],"domain_scores_gemma":[0.9976369,0.0007771976,0.0001798528,0.0009625876,0.000138473,0.0003050465],"domain_codex":null,"domain_gemma":null,"domain_candidate":null,"domain_consensus":null,"study_design_codex":"observational","study_design_gemma":"observational","study_design_scores_codex":[0.0002613952,0.0009914353,0.9706399,0.00062011,0.0006756345,0.0001264782,0.0005225071,6.562582e-7,0.004213413,0.0002234211,0.01138148,0.01034356],"study_design_scores_gemma":[0.01226263,0.0004772404,0.7934939,0.001367869,0.002128521,0.00009304078,0.004652433,0.0009406023,0.03380195,0.004785584,0.1449875,0.001008733],"study_design_candidate":"observational","study_design_consensus":"observational","genre_codex":"empirical","genre_gemma":"empirical","genre_scores_codex":[0.9660581,0.01551636,0.00004529917,0.003389276,0.0002934713,0.0005029438,0.000009777522,0.0001272648,0.01405745],"genre_scores_gemma":[0.988667,0.00327367,0.0005009286,0.002257367,0.0002767433,0.00008357379,0.0001129575,0.00003599736,0.004791816],"genre_candidate":"empirical","genre_consensus":"empirical","teacher_disagreement_score":0.177146,"threshold_uncertainty_score":0.9999828,"prediction_status":"machine_predicted_unvalidated"},"machine_scores":{"provisional":true,"baseline":true,"maturity_gate_passed":false,"score_opus":0.01806140723967703,"score_gpt":0.3429661727903504,"score_spread":0.3249047655506734,"validation_status":"score_only:v0-immature-baseline","note":"Baseline scores from an immature model (maturity gate not passed). Scores rank; they never assert a category."}}