Name this test: 1 – better because it accounts for the actu…
Name this test: 1 – better because it accounts for the actual biologically active form, 2 – hard to accomplish in an outpatient setting (though it can be done in a regular laboratory on an properly-equipped ABG instrument), and 3 – the best way to test for the HYPO form of this substance. (Hint: answer should be 2 words)