I just had the same result. It is nothing to worry about. The NVG means "no value given." It happens frequently in insurance physicals, because the sample is not tested immediately, and the blood level changes with time and temperature. In the summer, an average of 25% of samples are listed as NVG. You can read about it on page 7 of the following article https://www.heritagelabs.net/NewsletterPDF/Envoy_Vol1_Issue_3.pdf
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