Thyroid UK


Am to have an ACTH test shortly but I have been using a 1% hydrocortisol cream for the past 5 days. Just wondered if this wd effect the results as I know that it is advised to leave a couple of wks after use before taking the saliva cortisol test. Also endo just said to have test in the morning but when I looked test up on Google guidance was to have test as early as pos and fast for 8 hrs. Any advice?

2 Replies

Hi Caze, Other steroid meds can interfere so it may be a good idea to ask your GP or endo what to do. The info I have is that the test is best performed early morning. This NHS Trust has info:

Hope this helps.


Thanks Lin. I'll just wait a couple of weeks after I finish using the cream. Thanks for the link - very useful.

Best Cx


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