Medical Consumables and Lab Consumables OEM Manufacturer
Medical Consumables and Lab Consumables OEM Manufacturer

Double-wall Tubes

Golden VacTM blue-top blood tubes specially designed with double walls are made of polypropylene(PP) and polyethylene terephthalate(PET). Polypropylene is ideal for sensitive coagulation parameters due to its nonreactive characteristics. The inner tube is made of polypropylene and prevents the evaporation of liquid. The outer tube is made of polyethylene terephthalate and ensures a long shelf-life for the vacuum.

Description of Double-wall Tubes


Sodium citrate is used as anticoagulant to prevent blood from clotting.


Filled with a buffered sodium citrate solution in a concentration of 0.109mol/L (3.2%).


The blood to additive ratio is 9:1. The ratio of blood to anticoagulant is critical for valid prothrombin time results. 


Immediately after draw, gently invert the tube 3-4 times in order to activate adequate anticoagulant.


Centrifugation: 2000-2500 g for 10-15 minutes at 18-25° C.

Specification of Double-wall Tubes

Cat. NoVolume/mlSize/mmAdditiveSeparatorMaterialCap ColorClosure
GD018SCD1.813X75Sodium Citrate 3.2%/PET (Double Wall)Cap ColorSafety Cap+Rubber
GD027SCD2.713X75Sodium Citrate 3.2%/PET (Double Wall)Safety Cap+Rubber

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GD018SCD 1.8ml Sodium Citrate 3.2% Double-wall Tubes GD027SCD 2.7ml Sodium Citrate 3.2% Double-wall Tubes