Fig. 4.

Comparison of the classification performance to assess the sample and/or data quality in clinical lipidomics studies by a lipid triplet (LPC 16:1, LPC O-18:1, and LPE 20:4) as a possible quality control biomarker pattern and an already published lipid-based QC marker, the ratio at lipid class level of LPC/PC. The classification performance is shown by an area under the receiver operating characteristic (ROC) curve (AUC) analysis. LPC, lysophosphatidylcholine; PC, phosphatidylcholine; QC, quality control.