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  • Title: A comparison of hard and soft glass blood-drawing tubes.
    Author: Laessig RH, Hassemer DJ, Hoffman GL, Westgard JO, Carey RN, Feldbruegge DH.
    Journal: Am J Clin Pathol; 1979 Dec; 72(6):952-5. PubMed ID: 517461.
    Abstract:
    The authors examined both hard and soft glass evacuated blood-drawing tubes for possible effects on clinical chemistry measurements. Using routine laboratory procedures, no clinically or statistically significant difference could be detected in 34 analytes using 66 different methods. A special high-precision study utilizing an adaption of the NBS round-robin procedures for calcium, magnesium, sodium, and potassium detected no difference between paired sera when drawn or stored for 72 hours, or both, in the two types of glass. The authors conclude that the type of glass used in production of the evacuated blood-drawing tubes does not affect the clinical chemistry results obtained.
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