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IMPROVACUTER®  No Additive Tubes offer serum for determinations in chemistry, immunology and serology. The minimum recommended clotting time for serum tubes without Clot Activator is 90 minutes.

IMPROVACUTER® ESR Tubes are used for Westergren sedimentation rate determination. The tubes contain buffered sodium citrate solution as an anticoagulant. Citrate concentration of either 0.109M(3.2%) or 0.129M (3.8%) is available. The mixing ratio is 1 part citrate to 4 parts blood.