Sediplast ESR Sedimentation Tubes

Sediplast is Polymedco's disposable Westergren system for erythrocyte sedimentation rate (ESR) testing — the closed, self-zeroing approach that replaced the open-tube pipetting labs relied on for decades. If your lab runs manual ESRs and wants a safer, more consistent method than aspirating blood into glass Westergren pipettes, this is the system built for exactly that workflow.

The Sediplast Sedimentation Tube (S100) is a 220 mm plastic Westergren tube with a ventilation cap and built-in sodium citrate additive. The design draws blood up automatically when the pipette is inserted into the prefilled reservoir, self-zeroing the sample and eliminating the open-air handling and manual dilution steps that create both variability and exposure risk. Non-sterile and single-use, each tube is discarded after the reading, so there's no glassware to clean or recalibrate. The clear, uncolored plastic gives you an unobstructed column for reading the fall of red cells at one hour.

A few things labs typically ask about this system: the sodium citrate is already incorporated, so you're working to the standard 4:1 blood-to-citrate ratio without a separate dilution step; the tubes read against a standard 200 mm scale; and because everything is enclosed and plastic, the method aligns well with modern safety practices around bloodborne pathogen exposure. Buyers generally order these by the case to keep a consistent supply on hand, since ESR is a routine, high-volume request.

Sediplast pairs naturally with the rest of your hematology bench. Explore related products in our Laboratory category, or return to the Honest Medical homepage to browse the full range of clinical supplies.