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Table 1 Results of patient testing before and after IVIg administration, discrepant results noted in bold

From: Clinical false positives resulting from recent intravenous immunoglobulin therapy: case report

Investigation Reference intervals Pre-IVIg   Post IVIg  
  (units) Interpretation Value Interpretation Value
Total IgA 0.4–3.5 (g/L) Normal 1.16 Normal 1.1
Total IgG 6.5–16.0 (g/L) Normal 10.01 High 36.93
Total IgM 0.5–3.0 (g/L) Normal 0.63 Normal 0.59
CMV IgG < 0.5 (U/mL) Negative < 0.3 Positive 467
Hepatitis A total antibody < 20.0 (IU/L) Negative 8.0 Positive > 60
Hepatitis A IgM antibody < 1.0 (COI) Negative < 0.3 Negative < 0.3
Hepatitis B surface IgG antibody < 10.0 (IU/L) a Positive > 1000 Positive > 1000
Hepatitis B core IgM antibody < 1.0 (COI) Negative 0.1 Negative 0.1
Hepatitis B core total antibodies b > 1.0 (COI) Negative 2.3 Positive < 0.8
Hepatitis B surface antigen < 0.9 (COI) Negative 0.3 Negative 0.3
Hepatitis C antibody < 0.9 (COI) Negative 0 Negative 0.1
  1. a = non-immune b = competitive immunoassay; results > 1.0 are negative
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