A venipuncture base plate assembly includes an adapter and a patient interface platform. The adapter has a substantially flat retention clip and a platform coupled to the retention clip with two or more posts mounted on it. The patient interface platform includes a base pad having a bottom surface coated with an adhesive substance and a base unit coupled to the base pad. The base unit includes a base plate and a retainer mounted on the base plate that supports the adapter at two or more variable angles relative to the base plate.