Can serum extracted from capillary blood be used for IgE testing?

ImmunoCAP Specific IgE

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Yes, serum from capillary blood and serum from venous blood will give identical results when testing for total IgE, specific IgE and Phadiatop in ImmunoCAP.
 
References
  1. Liappis, N; Berdel, B. Determination of total IgE and of specific IgE in the serum of capillary blood. Allergologie;1998;11:10-12.
  2. Lilja, G; Magnusson C G; et al. Neonatal IgE levels and three different blood sampling techniques. Allergy;1992;47:522-526.
  3. Bauer, C; Atopy screening in children: Total IgE, Phadiatop, and RAST multiple food allergen disc performed on capillary blood samples. Allergologia e Immunologia Clinica; 1987; 2:95.