Maybe I'm looking too much into this, but MVX sounds like an end-run around Labcorp not providing medical advice.

Here's Labcorp's page:

https://www.labcorp.com/tests/123590/metabolic-vulnerability...

This test was developed and its performance characteristics determined by Labcorp. It has not been cleared or approved by the Food and Drug Administration.

This sounds like a proprietary index. An index is not a absolute measurement, but a specific weighing of multiple measures and run through an algorithm. I can't find that Quest Diagnostics offers this test, although that may be temporary.

Labcorp can now say, "According to our test you are unhealthy." without a doctor involved. If somehow it gets accepted, only Labcorp can administer it, unlike a normal blood test that measures actual values.