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A chemiluminescence sandwich enzyme immunoassay, using a glucose oxidase (GO) label, was developed for detecting attomole amounts of human granulocyte colony stimulating factor (G-CSF). Purified goat (F(ab')2 immobilized on a bead and purified goat Fab' labelled with GO were selected in combination with a chemiluminescent detection system comprising luminol and ferricyanide. The detection limits for G-CSF were 4amol/assay (1 pg/mL) in buffer solution and 10 amol/assay (2.5pg/mL) in human serum. Coefficients of variation within assay and between assay ranged from 5.5% to 7.8% and from 3.4% to 16.0%, respectively. The C-CSF content of serum from normal healthy individuals was measurable using this method. G-CSF in 24 normal human sera showed a mean value of 19.3pg/mL and ranged from 3.6 to 83.0pg/mL.

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