We show that a post-PCR multicolor fluorescence-labeling technique is applicable to multiplex microsatellite genotyping. Forty-three dinucleotide microsatellite markers, which are located on 11q13-23, a candidate region for dominant familial exudative vitreoretinopathy (FEVR), were used to evaluate the quality of the marker profile produced by this technique. Thirty-eight people from six families with this disease were subjects for genotyping. The samples revealed clearly separated fragment peaks with signal intensities sufficient for analysis. All genotypes were consistent with Mendelian inheritance within each family. This method is cost effective because it does not use expensive fluorescently labeled primers. It also has the advantage of avoiding ambiguity in the analysis, which may arise from the addition of non-template nucleotides by Taq DNA polymerase.