Prevalence of elevated serum concentrations of biotin in patients from South East England, Korea, Singapore and Thailand and risk of immunoassay interference

Brady, Sally; Bates, Katharine; Oddy, Susan; Jeon, You La; Pichayayothin, Tosapol; Tetteh, Ruby; Voong, Kieran; Harrington, Dominic J

doi:10.1136/jcp-2022-208733

Cited by 1 publication

(1 citation statement)

References 17 publications

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“…Accordingly, the interference from biotin in a sample can mimic typical pathological constellations of the pituitary and the peripheral hormone in an axis that may lead to wrong diagnoses (see Table 2 ). Most reports in the literature are focus on problems in evaluation of the thyroid axis [ 31 ], but other hormone assays can be affected as well [ 32 ].…”

Section: Analytical Pitfallsmentioning

confidence: 99%

Pitfalls in the lab assessment of hypopituitarism

Schilbach,

Bidlingmaier

2024

Rev Endocr Metab Disord

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The diagnostic approach to hypopituitarism involves many disciplines. Clinical symptoms rarely are specific. Imaging techniques are helpful but cannot prove the specific functional defects. Therefore, the definitive diagnosis of pituitary insufficiency is largely based on laboratory tests. However, also laboratory methods come with inherent limitations, and it is essential for the clinician to know and recognize typical pitfalls. Most factors potentially impairing the quality of hormone measurements are introduced in the preanalytical phase, i.e. before the hormones are measured by the laboratory. For example, the timing of blood drawing with respect to circadian rhythm, stress, and medication can have an influence on hormone concentrations. During the actual analysis of the hormones, cross-reactions with molecules present in the sample presenting the same or similar epitopes than the intended analyte may affect immunoassays. Interference can also come from heterophilic or human anti-animal antibodies. Unexpected problems can also be due to popular nutritional supplements which interfere with the measurement procedures. An important example in this respect is the interference from biotin. It became only clinically visible when the use of this vitamin became popular among patients. The extreme serum concentrations reached when patients take it as a supplement can lead to incorrect measurements in immunoassays employing the biotin-streptavidin system. To some extent, hormone analyses using liquid chromatography mass spectrometry (LCMS) can overcome problems, although availability and cost-effectiveness of this method still imposes restrictions. In the post-analytical phase, appropriateness of reference intervals and cut-offs with respect to the specific analytical method used is of outmost importance. Furthermore, for interpretation, additional biological and pharmacological factors like BMI, age and concomitant diseases must be considered to avoid misinterpretation of the measured concentrations. It is important for the clinician and the laboratory to recognize when one or more laboratory values do not match the clinical picture. In an interdisciplinary approach, the search for the underlying cause should be initiated.

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Section: Analytical Pitfallsmentioning

confidence: 99%