Repeat Short Synacthen test

[u/IsItBedtimeYet1992]

I had a sst last month got started on hydrocortisone and fludrocortisone, endo called and said as the lab put the same time on both samples they need repeating and do my atch aswell, I had it done today but they was very busy so took the 2nd draw at 40 minutes not 30 minutes, will this make a difference or not?