R.P., and R.Z., conceived the original idea and directed the whole research work. R.Z., and R.P., designed and built the quantitative phase microscope. S.S. performed leukocyte isolation and imaging experiments following guidance from R.P. X.S., designed, implemented, and optimized the classification models and analyzed the results following guidance from R.Z. D.J., and X.Z., provided guidance on the optimization of the classification models. X.S., and R.Z., wrote the manuscript with contribution from all the authors.

Conflict of Interest

A US provisional patent has been filed. R. Z. has financial interests in Bay Jay Ray Technology Limited.