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I was scheduled last week for blood work prior to my doctors appointment and the nurse mentioned to have the test done early morning I said ok. Went in this morning at 9-15 for the blood test and prior to the test she said what time did you awaken this morning I just said six am and she replied there is one test we cannot perform as it has to be done within three hours of rising in the morning I the replied it was 6-45am was the exact time I woke so she said no problem we can do all the tests. So I wondered what the test was and it was for Cortisol levels. And tumours effect those levels.
Found intresting article on this subject which I believe the doctors can use during your treatment using blood samples.