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PT tubes is mainly used for the test of blood coagulation mechanism. It is filled with bufferen tri-sodium citrate solution, and citrate concentrations of either 0.109mol/L(3.2%) or 0.129mol/L(3.8%) are available. The choice of the concentration depends upon the polices of the laboratories. The mixing ratio is 1 part citrate to 9 parts blood with the advantage of high accurate blood-to-additive ratio. It can provide an excellent condition for the test of PT and APTT values.
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