Will Viagra effect test results?

Hi guys, I am going in for blood tests during the week as recommeded.

But I may be meeting up with a girl Sunday night, and if I do I want to pop a viagra at some stage through the night.

Will this influence my test results in any way if they take my blood the following morning?

They will be testing FE/ESR, E/LFTs, BSL, TSH, PROLACIN, FSH, LH, Tetostrone Level, Vit D.

Thanks for your help.
Michael