[Interest of the study of a not identified peak on a hemoglobin chromatogram: delta variant or inter-sample contaminations?].

D-10(®) (Bio-Rad) analyzer using cationic exchange high performance chromatography (HPLC) allows the detection of the main hemoglobin variants. This observation shows the presence of a peak on chromatogram with a low intensity and no quantifiable which can lead to different diagnosis. Inter-sample contaminations can be confused with the presence of an hemoglobin variant. This case highlights the importance of the knowledge of technicals limits for validation and clinical use of results.