<i>Medical tests that aren&#x27;t actionable aren&#x27;t useful.</i><p>True, but screening tests are very useful.  If you can separate the population into &quot;definitely diabetic&quot;, &quot;definitely not diabetic&quot;, and &quot;needs more testing&quot; quickly and cheaply, that&#x27;s a win.  The fact that it doesn&#x27;t <i>always</i> give you an actionable result doesn&#x27;t make it useless.