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  • Title: Eosinophil cationic protein in serum from nonatopic and asymptomatic atopic individuals after standardized blood clotting at 37 degrees C.
    Author: Pronk-Admiraal CJ, Bartels PC, Mulder K.
    Journal: Ann Clin Biochem; 1999 May; 36 ( Pt 3)():353-8. PubMed ID: 10376078.
    Abstract:
    Eosinophil cationic protein (ECP) and ECP/eosinophil ratio were measured in 223 apparently healthy subjects. The serum sample for ECP measurement was obtained by standardized clotting of the blood sample for 2 hours at 37 degrees C. Eosinophil count, ECP concentration and ECP/eosinophil ratio were no different between men (n = 122) and women (n = 101). Reference ranges for serum ECP and ECP/eosinophil ratio were 12-99 micrograms/L and 61-367 micrograms ECP per 10(9) eosinophils, respectively. Serum ECP and blood eosinophil count were positively correlated (y = 141x + 18, R2 = 0.45, P < 0.001). The ECP/eosinophil ratio, however, was found to decrease with increasing eosinophil count. Twenty-three per cent of the apparently healthy subjects were found to have a positive score for immunoglobulin E antibodies specific to inhalant allergens, and thus were considered atopic. Serum ECP concentrations and eosinophil counts were significantly higher in this group compared with the non-atopic group. In this healthy population no decision level for either eosinophil count, serum ECP or ECP/eosinophil ratio could be found that discriminated atopic from non-atopic individuals.
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