Ay mama, I feel you, the lab tests can be pricey talaga, especially when you're pregnant! Hindi ako sure exactly kung saan ang cheapest sa Cainta and Taytay area, pero a few of us tried going sa smaller labs or diagnostic centers outside the big hospitals, at minsan mas mura talaga compared sa major chains. Best ko lang mag-suggest na tanungin mo directly ang few clinics around your area, usually willing sila mag-quote ng prices over the phone, tapos makikita mo kung nasaan ang best deal para sa OGTT mo. Sana makakita ka ng affordable option at all goes well sa test!