Hi mama! I'm not from Calamba kaya hindi ako sure exactly kung saan specific ang CAS dito, pero usually available sya sa major hospitals or the municipal health center, best to call the Calamba City Health Office directly para sure kung saan they're offering it ngayon. A few of us mums from other areas just went straight to the nearest hospital with pediatrics para hanapin kung available, or you can also ask your OB agad during check-up kung saan recommended nila locally para sa baby screening mo. Hope you find it quickly, mama!