Re-evaluation of the storage conditions for blood samples which are used for determination of complement activation

• Published in: Journal of immunological methods 1995, Vol.182 (1), p.1-5
• Main Authors: Stöve, S, Klos, A, Bautsch, W, Köhl, J
• Format: Article
• Language: English
• Subjects: Analysis of complex biological substances; Analytical, structural and metabolic biochemistry; Anaphylatoxins - analysis; Biological and medical sciences; Blood and biological fluids; Blood Preservation - methods; C3a; Complement activation; Complement Activation - drug effects; Complement C3 - analysis; Complement C3a - analysis; Cryopreservation - methods; Fundamental and applied biological sciences. Psychology; Humans; Receptors, Complement - analysis; Sepsis; Sepsis - immunology
• ISSN: 0022-1759; 1872-7905
• DOI: 10.1016/0022-1759(95)00012-Y

EDTA-blood samples derived either from healthy staff or septic patients were investigated for in vitro complement activation during the first 48 h after blood drawing at 4° C and 20° C. For this purpose C3a C3a desArg plasma levels were determined by the ABICAP C3a assay. Within the septic group no complement activation was detectable during the whole observation period. However, if blood from healthy persons was stored for longer than 6 h at 20° C complement activation occurred. The most profound activation was found in EDTA-blood stored for 48 h at 20° C. C3a values in this sample increased four-fold from 56 ± 7 ng/ml to 222 ± 38 ng/ml. From these data we conclude that both immediate cooling of EDTA-blood to 4° C, as well as the immediate separation of plasma as proposed by Mollnes et al. (Clin. Exp. Immunol. (1988) 73, 484), is not necessary for determination of anaphylatoxin plasma values. Storage of EDTA-blood samples for up to 6 h without the need to perform centrifugation should allow anaphylatoxin measurement to become a routine parameter for diagnosis of inflammatory diseases.