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Our modification of the ordinary vacuum tube which was devised by Keidel for the collecting of blood specimens, and which has demonstrated its usefulness in the hands of the practicing physician, will undoubtedly receive enthusiastic support from the laboratory technician. From the laboratorian's point of view, the old form of Keidel tube is a nuisance for the reasons that:
It does not fit the standard centrifuge tubes of the International Centrifuge Company.
It is very difficult to gain access to its contents without risk of contamination.
There is constant danger of accidental cuts from jagged fragments of glass.
The design of tube shown in the accompanying illustration is constricted and scored so that the top of the tube can be removed under aseptic conditions without danger to the operator. It holds approximately 8 cc. to the first shoulder, and fits both the long and short types of brass centrifuge tube
Young CC. MODIFIED KEIDEL TUBE FOR COLLECTING BLOOD SPECIMENS. JAMA. 1922;79(9):739. doi:10.1001/jama.1922.26420090001015
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