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Screening for antibody deficiencies in adults by serum electrophoresis and calculated globin

de Toledo Piza, Cristina Frias Sartorelli, Aranda, Carolina Sanchez, Solé, Dirceu, Jolles, Stephen and Condino-Neto, Antonio 2023. Screening for antibody deficiencies in adults by serum electrophoresis and calculated globin. Journal of Clinical Immunology 10.1007/s10875-023-01536-1

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Purpose This study aimed to investigate the correlation between calculated globulin (CG, total protein level minus albumin level) and the gamma globulin fraction (Gamma), obtained from serum protein electrophoresis with serum IgG levels in adults (≥ 18 years). Methods Using linear regression models, analyses of CG and Gamma levels correlation with IgG levels in adults were performed. Receiver-operator curves were created to determine cutoff values and the respective sensitivity and specificity measures. Results A total of 886 samples were analyzed. CG and Gamma were positively and statistically correlated with IgG levels (r2 = 0.4628 for CG, and = 0.7941 for Gamma, p < 0.0001 for both analyses). For the detection of hypogammaglobulinemia, i.e., IgG level below the reference value (6 g/L), a CG cutoff value of 24 g/L showed a sensitivity of 86.2% (95% CI 69.4–94.5) and a specificity of 92% (90.0–93.6). A Gamma cutoff value of 7.15 g/L yielded a sensitivity of 100% (88.3–100) and a specificity of 96.8 (95.3–97.8). Conclusion Both CG and Gamma levels determined by protein electrophoresis analysis may be used to screen for antibody deficiencies in adults, enabling earlier diagnosis of antibody deficiencies in a routine clinical setting.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Medicine
Publisher: Springer
ISSN: 0271-9142
Funders: N/A
Date of Acceptance: 9 June 2023
Last Modified: 31 Jul 2023 12:45

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