In the veterinary market we use analyzers that require ~100uL blood, about two drops of an eyedropper. Device makers have machines that run the gamut from tiny

In the veterinary market we use analyzers that require ~100uL blood, about two drops of an eyedropper. Device makers have machines that run the gamut from tiny and portable to room sized, and the main difference is throughput. My analyzer can run about 3 samples per hour. A big Siemens or Toshiba can be continuously loaded to run hundreds. The biggest risk from a medical standpoint of using a machine like Theranos wanted was using capillary blood. You really would need a lot of data to interpret the results like we have for venous blood.