A standard venous draw uses three matched pieces, and Greiner Bio-One manufactures all of them to a single fit standard. The Vacuette Blood Collection Tube Holder (450209) seats the multiple-use drawing needle securely, while the 22-gauge, 1-1/4 inch Multiple Use Blood Collection Needle (450061) provides a sterile, conventional straight needle sized for routine venipuncture. From there, the tube determines the test:

• Serum tubes (454241): 3 mL, plain white cap, for serum chemistry and serology.
• Coagulation tubes (454331): 3.5 mL, light blue cap with sodium citrate additive, for PT/INR and clotting studies — where the correct 9:1 fill ratio matters for accurate results.

These VACUETTE tubes use a 13 x 75 mm PET body rather than glass, reducing breakage risk and biohazard exposure, and arrive sterile with a pull cap for straightforward handling.

The universal question at the draw station is which tube for which test. Greiner Bio-One follows international color coding: white/clear for plain serum, light blue for sodium citrate coagulation work. Matching cap color to additive — and drawing tubes in the correct order — prevents cross-contamination and preserves specimen integrity.

For non-blood diagnostics, the collection also includes the 100 mL Urine Specimen Container (724321) with a leak-resistant yellow screw cap for routine urinalysis. Exploring other laboratory suppliers? Compare related lines such as Bio Plas for additional lab plasticware.