Rapid and simple quantitative measurement of alpha-fetoprotein by combining immunochromatographic strip test and artificial neural network image analysis system.
BACKGROUND
Quantitative immunochromatographic strip (ICS) assay can facilitate clinical diagnosis by providing more information than traditional qualitative or semiquantitative strip assay.


METHODS
We constructed a human serum alpha-fetoprotein (AFP) measurement system by combining semiquantitative ICS tests and artificial neural network (ANN) image analysis system [immunochromatographic strip analyzed by artificial neural network image analysis system (IAIS)]. After ICS tests completed, the AFP concentration can be obtained from analysis of IAIS software. The equipment required are commercial semiquantitative AFP dipstick, optical scanner, centrifuge (option), personal computer, and software of IAIS.


RESULTS
The serum AFP concentrations measured by IAIS were strongly correlated (r = 0.9971) with that by RIA. Using Bland-Altman analysis, the IAIS achieved clinical acceptable limits of agreement in comparison with RIA. The within-run precision of IAIS, expressed as coefficients of variation (CV), at 81.7 ng/ml was 1.50% and, at 244.4 ng/ml, was 1.09%. The measurement of serum AFP by IAIS can be completed in 20 min.


CONCLUSIONS
The newly constructed quantitative immunochromatographic strip assay (IAIS) is a simple, rapid, and reliable method for serum AFP measurement. With the simple equipment required, the IAIS can be performed outside the laboratory and is ideal for outpatient or point-of-care AFP testing.
Chuang
Louise
L
Department of Obstetrics and Gynecology, National Cheng Kung University Medical College and Hospital, Tainan, Taiwan.
Hwang
Jeng-Yang
JY
Chang
Hen-Chang
HC
Chang
Fong-Ming
FM
Jong
Shiang-Bin
SB
D014408:Biomarkers, Tumor / Q000032:analysis*; D006801:Humans; D016571:Neural Networks, Computer; D011863:Radioimmunoassay / Q000379:methods; D011934:Reagent Strips; D012680:Sensitivity and Specificity; D000509:alpha-Fetoproteins / Q000032:analysis*
D014408:Biomarkers, Tumor; D011934:Reagent Strips; D000509:alpha-Fetoproteins