The effect of time of day testing and utility of 30 and 60  minute cortisol values in the 250 mcg ACTH stimulation test.

CONCLUSION: We found that outcomes from ACTH testing are not affected by time of day. Furthermore, using a 30-min cortisol level in isolation results in more than one in seven patients having a false positive diagnosis of AI; a 60-min value of ≥500 nmol/L alone may be sufficient to diagnose AI in >99% of cases. PMID: 29458002 [PubMed - as supplied by publisher]
Source: Clinical Biochemistry - Category: Biochemistry Authors: Tags: Clin Biochem Source Type: research