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. 2011 Feb;32(1):5–31.

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The contents of articles or advertisements in The Clinical Biochemist – Reviews are not to be construed as official statements, evaluations or endorsements by the AACB, its official bodies or its agents. Statements of opinion in AACB publications are those of the contributors. Print Post Approved - PP255003/01665. Copyright © 2005 The Australasian Association of Clinical Biochemists Inc. No literary matter in The Clinical Biochemist – Reviews is to be reproduced, stored in a retrieval system or transmitted in any form by electronic or mechanical means, photocopying or recording, without permission. Requests to do so should be addressed to the Editor. ISSN 0159 – 8090

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Figure 14. — Method comparison between LC-MS/MS and immunoassay (Roche Cobas) measurement of PTH. (A) Scatterplot with regression fit and confidence intervals for slope and fit. (B) Bland-Altman plot showing percentage difference between methods plotted against the mean PTH of both methods. There is evidence for non-linearity of the difference, with the difference between the two assays first declining from a high percentage low bias for the immunoassay to a lesser percentage bias, and then to increasingly higher percentage biases for the immunoassays at very high PTH concentrations. Reprinted from Kumar *et al.* (Clin Chem 2010;56:306–13) with permission from Clinical Chemistry.

Figure 14.