An apparatus for correcting for cell aggregates in a cell suspension from patients. The apparatus includes a laser cytometry scanning mechanism for scanning cells of a sample of a cell suspension to obtain data about the samples patients. The apparatus includes a memory for storing the data, the memory in communication with the scanning mechanism patients. The apparatus includes a computer for identifying in the data cell aggregates in the samples from the samples that have been scanned with an APT function, the computer in communication with the memory. A method for correcting for cell aggregates in a cell suspension from patients with an APT function. A method for correcting for cell aggregates in a cell suspension from patients with up to 98.6% accuracy. A computer readable medium.