• Turk J Med Sci · Feb 2019

    Comparison of reference systems in the assessment of age-related serum immunoglobulin levels in pediatric patients

    • İlknur Külhaş Çelik, Ersoy Civelek, Ayşe Metin, Tayfur Giniş, Müge Toyran, Emine Dibek Mısırlıoğlu, and Can Naci Kocabaş.
    • Turk J Med Sci. 2019 Feb 11; 49 (1): 147152147-152.

    Background/AimIg level assessment is frequently used in the diagnosis and follow-up of immunodeficiency, as well as in studies investigating the prevalence of low serum Ig level in specific diseases.Materials And MethodsPatients who underwent Ig testing in the inpatient and outpatient clinics of our hospital in the years 2010–2016 were included. The Ig levels of the patients were assessed separately according to two reference systems commonly used in Turkey and another reference system used in the USA.ResultsA total of 20,138 patients (57.6% male) were included in the study. The median age of the patients was 55.7 months (interquartile range: 23.1–96.7). According to the reference intervals determined by Tezcan et al., 30.6% of the patients were deficient in one or more Ig values. This rate was 4 times higher than those based on the reference intervals determined by Aksu et al. (7.7%) and those in the Nelson Textbook of Pediatrics (6.8%). We also determined that the frequency of low Ig levels with three reference systemsConclusionIn this study, we found that the rates of low Ig level in a group of pediatric patients differed significantly when evaluated using three different reference systems for age-related serum Ig levels

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