FMU vs SMU

[jazzibelle]

I'm not in the TWW nor have I ovulated this month (yet). However, reading through new and old threads, I see a lot of contradictory advice around using the FMU or SMU when testing for PG.

I''ll be testing around the time AF is due, but I wanted to open up the discussion on why FMU is better than SMU, and vice versa?

[tossacoin1]

I've heard FMU is best cause it's when it is most concentrated however for me on both occasions SMU came up with a stronger positive

[ivfgottostaypositive]

Some people's urine metabolises hcg quicker than others - something about the protein in urine so actually the longer you hold your wee the more diluted hcg becomes because it has had more time to break it down

I would say this is the exception rather than the norm though

[jazzibelle]

Is this why some recommend using SMU then?

Would the same be true when using OPKs? Or is it only relevant to HCG?

[NoCallerID]

I'm one of those people who get stronger BFPs in the late afternoon 🤷🏻‍♀️