Serum eosinophil cationic protein determination in asthmatic children-effect of different collecting tubes used for...

Area of Science:

• Clinical Chemistry
• Pediatric Allergy and Immunology

Background:

• Eosinophil cationic protein (ECP) is a key marker for eosinophilic inflammation, particularly relevant in asthma.
• Accurate measurement of biomarkers like ECP is crucial for diagnosis and monitoring of pediatric asthma.

Purpose of the Study:

• To compare the effect of two different serum collection tubes on circulating eosinophil cationic protein (ECP) levels.
• To evaluate ECP levels in asthmatic children versus controls using serum separation tubes (SST) and conventional glass tubes.

Main Methods:

• Serum samples were collected from asthmatic children and healthy controls using serum separation tubes (SST) and glass tubes.
• Circulating eosinophil cationic protein (ECP) levels were measured in both tube types.
• Correlation analysis was performed between ECP levels, peripheral eosinophil counts, and tube type.

Main Results:

• Serum ECP levels were significantly higher in asthmatic children compared to controls, irrespective of tube type.
• ECP levels were significantly higher in serum from SST compared to glass tubes in asthmatic children (P<0.01), but not in controls.
• ECP levels correlated with peripheral eosinophil counts in both tube types, and the difference in ECP between tubes correlated with eosinophil counts.

Conclusions:

• Serum ECP measurements are influenced by the type of collection tube used, particularly in asthmatic children.
• Direct comparison of ECP levels obtained from SST and glass tubes is not recommended, especially for asthmatic children with eosinophilia.
• Standardization of serum collection methods is important for reliable ECP assessment in pediatric asthma research and clinical practice.