Ay, di ko sure ng exact price sa Novaliches, pero usually around 800-1500 pesos ang OGTT sa government hospitals dito, best to call them directly kasi may promo or assistance programs pa sila sometimes! About sa puyat, honestly, a few of us tried doing it kahit medyo tired kami at okay pa rin ang results, pero ang mas accurate talaga is kung well-rested ka, so if you can, try to get good sleep the night before, mas reliable ang reading and mas comfortable pa for you at baby.