Handheld Testing - An existing solution, page-3

How they do it.....from Wiki

"Theranos uses a fingerstick to draw a micro sample of blood into a cartridge, which is loaded into a local reader for analysis. The results are sent wirelessly from the reader to a secure database.[12] The company says that the results are received faster than the usual three-day delay for centralised laboratory testing,[1] up to 30 blood tests can be performed on a single blood sample,[19] and its method ensures accuracy by eliminating or reducing most human handling and delays associated with traditional blood tests."

They charge $2.99 for a blood cholesterol test.