Jorgensen fabricated the microfluidic devices. Mr. Davis performed the principal component analysis with the data provided by Dr. Frydman. Dr. Hayden advised on the experimental design and statistical analysis. Dr. Van Cott advised on the study design and interpretation of the data and edited the article. Ms. Dalzell, Ms. Padmanabhan, and Dr. Majmudar screened and provided the clinical samples. Drs. Tompkins and Toner contributed to the microfluidic design. Drs. Fox, Tompkins, and Toner reviewed the final article.