DESCRIPTION

Used for the quantitative determination of Lexatumumab concentration in serum and plasma.

This kit employs the quantitative competitive enzyme immunoassay technique: recombinant Human CD262 is pre-coated onto the microplate and a biotin-labeled Lexatumumab is used as the competing tracer.

PRINCIPLE OF THE ASSAY

This assay employs the quantitative competitive enzyme immunoassay technique. Recombinant Human CD262 has been pre-coated onto a microplate. Standards or samples are premixed with biotin-labeled antibody and then pipetted into the wells. Lexatumumab in the sample competitively binds to the pre-coated protein with biotin-labeled Lexatumumab. After washing away any unbound substances, Streptavidin-HRP is added to the wells. Following a wash to remove any unbound enzyme reagent, a substrate solution is added to the wells and color develops in inversely proportion to the amount of Lexatumumab bound in the initial step. The color development is stopped and the intensity of the color is measured.

PRECISION

Intra-assay precision (precision within an assay): <20%.

Three samples of known concentration were tested sixteen times on one plate to assess intra-assay precision.

Inter-assay precision (precision between assays): <20%.

Three samples of known concentration were tested in twenty four separate assays to assess inter-assay precision.

		Intra-Assay Precision			Inter-Assay Precision
Sample		1	2	3	1	2	3
n		16	16	16	24	24	24
Mean (ng/mL)		5764.3	1313.3	334.2	5327.5	1213.6	269.8
Standard deviation		316.3	102.3	43.9	339.1	55.6	29.4
CV (%)		5.5	7.8	13.1	6.4	4.6	10.9

RECOVERY

The recovery of Lexatumumab spiked to three different levels in human serum samples throughout the range of the assay was evaluated.

Sample	Dilution factor	Average (%)	Range (%)
Human serum (n=3)	1:10	98	88-115
	1:20	88	81-106

LINEARITY

To assess the linearity of the assay, human serum samples were spiked with high concentrations of Lexatumumab and diluted with the Standard Diluent to produce samples with values within the dynamic range of the assay. (Human serum samples were prediluted 10 fold)

Sample	Dilution factor	Average (%)	Range (%)
Human serum (n=4)	1:2	91	82-95
	1:4	97	84-104
	1:8	97	86-111
	1:16	100	82-118