1. A method for classifying a biological specimen on a specimen carrier to determine whether the specimen requires further analysis, the method comprising: acquiring images of objects in the specimen; identifying objects of interest in the images; acquiring additional images of the identified objects of interest at a plurality of different wavelengths; extracting cellular features of the identified objects of interest from the additional images; and classifying the specimen according to a probabilistic model based on the extracted cellular features to determine whether the specimen requires further analysis.