Hindi talaga sa pharmacy lang ang blood serum test, kailangan mo ng lab or clinic para doon, kahit may partnerships ng some pharmacies with labs. One of my mum friends had to go to LabCorp or Medic or even sa hospital para sa kanyang tests, kasi they need proper equipment and trained phlebotomists para ma-draw ang blood properly at ma-process nang tama. Best bet mo is mag-call sa nearest lab or clinic in your area para malaman mo kung paano exactly ang process at kung may appointment ka na kailangan, basta mas convenient para sa'yo!