I wondered the exact same thing about the gestational diabetes test, never got an explanation about why it was
necessary, couldn't understand what benefit there could be to drinking an amount of sugar that I would never otherwise ingest to see if I had a
condition I was unlikely to have that would be treated by following a diet and exercise plan less
stringent than what I already did, so I ultimately declined it — a decision which was readily accepted by the CNMs providing care at my hospital's practice.