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Clinical Chemistry 38: 764-765, 1992;
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Clinical Chemistry, Vol 38, 764-765, Copyright © 1992 by American Association for Clinical Chemistry

Special collection and storage tubes for blood endotoxin and cytokine measurements

H Redl, S Bahrami, G Leichtfried and G Schlag
Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Vienna, Austria.

Commercially available blood-collection tubes may be contaminated with endotoxin (315 +/- 95 pg/tube) and could therefore be unsuitable for blood collection for endotoxin measurement. Plasma separation and storage are a potential source of contamination. To avoid contamination and error, we have developed new blood collection tubes that contain heparin free of endotoxin (LPS) and a gel to separate plasma and blood cells. The LPS content is less than 4 pg/tube. Samples can be stored and frozen without plasma withdrawal to preclude contamination. LPS recovery experiments have shown that the new blood-collection tubes do not bind LPS to the separation gel or vial wall. With these tubes, in vitro formation of tumor necrosis factor (404 +/- 163 ng/L in standard tubes vs less than 40 ng/L in special collection tubes) is minimized.


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C. J. Wiedermann, S. Kiechl, S. Dunzendorfer, P. Schratzberger, and J. Willeit
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J. Am. Coll. Cardiol., August 1, 2000; 36(2): 656 - 657.
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Copyright © 1992 by the American Association for Clinical Chemistry.