Abnormal Serum Cortisol Result

I had my first consult with the surgeon last week. He requested that I have one last test done before submitting the request to my insurance for approval. Doctor wanted me to have a Serum Cortisol test done. I had to begin fasting at 8pm and take a pill at 11pm and then have my blood drawn at 8am the following morning. Today I get the lab results in the mail and it's indicated that the test results are "abnormal". No explanation. I have no idea what this means. My results were "0.2 ug/dL" and apparantly "normal" is 8-24 at the 8AM hour and 4-12 at the 4PM hour. The only blood drawn for me was at 8AM. That's the only time Doctor said to have blood drawn. So now I'm concerned because this result came back "abnormal"...Is there anyone who can shed some light on this for me? Thanks.

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