Open AccessBiotin analytical interference on Siemens immunoanalysis on Dimension EXL®: impact on cardiac troponin I and total vitamin D (D2+D3) assays
Author(s) -
Mehdi Djebrani,
Firas Jabbour,
Florence D. Hulot,
Philippe de Mazancourt
Publication year - 2019
Publication title -
annales de biologie clinique
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.167
H-Index - 27
eISSN - 1950-6112
pISSN - 0003-3898
DOI - 10.1684/abc.2019.1503
Subject(s) - biotin , streptavidin , chemistry , vitamin , chromatography , biochemistry
Several hyperthyroidism misdiagnoses cases have been recently described due to biotin intake. Biotin used in immuno-analysis assays which rely on biotin/streptavidin binding properties. In these assays, high plasmatic biotin levels can lead to major analytical interferences resulting in falsely higher (competition tests) or falsely reduced determinations (for sandwiches assays). We performed a simulation test of biotin intake with patient's samples. We studied the effect of biotin on cardiac troponin I and total vitamin D (D 2 +D 3 ) assays that are using biotin-streptavidin binding on Dimension EXL®. Increasing doses of biotin were added (28 samples for each parameter) before the assays. The results evidenced a significant negative interference of biotin on cardiac troponin I determinations for concentrations of 100 ng/mL and above, with a total loss of signal for higher biotin additions. Such interference may lead to inappropriate therapeutic decisions. Positive interferences were observed on total vitamin D (D 2 +D 3 ) with less impact for therapeutic decisions.