With Walgreens and Safeway on board as retail partners, Elizabeth suddenly faced a problem of her own making: she had told both companies her technology could perform hundreds of tests on small blood samples. The truth was that the Edison system could only do immunoassays, a type of test that uses antibodies to measure substances in the blood. Immunoassays included some commonly ordered lab tests such as tests to measure vitamin D or to detect prostate cancer. But many other routine blood tests, ranging from cholesterol to blood sugar, required completely different laboratory techniques.

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