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    Determination of IGF-I, IGF-II, IGFBP-2, and IGFBP-3 levels in serum and plasma: comparisons using the Bland-Altman method.

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    Authors
    Renehan, Andrew G
    Jones, Jenny
    O'Dwyer, Sarah T
    Shalet, Stephen M
    Affiliation
    Department of Surgery, Christie Hospital NHS Trust, Wilmslow Road, Manchester M20 4BX, UK. arenehan@picr.man.ac.uk
    Issue Date
    2003-12
    
    Metadata
    Show full item record
    Abstract
    The measurement of circulating insulin-like growth factors (IGFs) and IGF binding proteins (IGFBPs) have significant implications in the risk assessment of various diseases (e.g. cancer) and growth abnormalities. It is often assumed that values measured in serum and plasma are interchangeable. This study challenges this assumption by comparing determinants using the Bland-Altman method. Blood was obtained from 47 healthy volunteers (age 21-72 years) in serum, heparin plasma and EDTA plasma, and IGF-I, IGF-II, IGFBP-2, and IGFBP-3 measured, and results compared. Mean values for IGF-I, IGF-II, IGFBP-2 and IGFBP-3 determined in all three media were generally comparable; correlations were generally strong and significant (P<0.001). However, the Bland-Altman plots revealed significant lack of agreement for many analytes measured in EDTA plasma compared with serum and heparin plasma. Additionally, the ranges of the limits of agreement were consistently greater for EDTA plasma compared with the other two methods. These findings emphasize the need to standardize methods of collecting blood samples in future epidemiological studies and trials.
    Citation
    Determination of IGF-I, IGF-II, IGFBP-2, and IGFBP-3 levels in serum and plasma: comparisons using the Bland-Altman method. 2003, 13 (6):341-6 Growth Horm. IGF Res.
    Journal
    Growth Hormone & IGF Research
    URI
    http://hdl.handle.net/10541/78969
    DOI
    10.1016/S1096-6374(03)00112-6
    PubMed ID
    14624768
    Type
    Article
    Language
    en
    ISSN
    1096-6374
    ae974a485f413a2113503eed53cd6c53
    10.1016/S1096-6374(03)00112-6
    Scopus Count
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