Because of their high sensitivity, high throughput, and low cost, microfluidic chips have gradually become powerful tools for biological analysis in the fields of fundamental biology, clinical applications, food safety, and environmental monitoring. Among these, the timely detection and analysis of biologically active small molecules in physiological processes such as oligonucleotides, oligopeptides, oligosaccharides, vitamins, minerals, and metabolites is critical for guiding therapeutic medication and predicting disease prognosis. Small biomolecules are found in the body's tissues, organs, bones, and tears, as well as saliva, sweat, urine, and blood.
For more: https://microfluidics.creative-biolabs.com/other-biological-fluids-analysis-on-microfluidic-chips.htm