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Clinical Chemistry and Laboratory Medicine (CCLM)

Published in Association with the European Federation of Clinical Chemistry and Laboratory Medicine (EFLM)

Editor-in-Chief: Plebani, Mario

Ed. by Gillery, Philippe / Lackner, Karl J. / Lippi, Giuseppe / Melichar, Bohuslav / Payne, Deborah A. / Schlattmann, Peter / Tate, Jillian R.

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IMPACT FACTOR 2016: 3.432

CiteScore 2016: 2.21

SCImago Journal Rank (SJR) 2016: 1.000
Source Normalized Impact per Paper (SNIP) 2016: 1.112

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1437-4331
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Volume 42, Issue 8 (Aug 2004)

Issues

Measurement of serum and plasma osmolality in healthy young humans – influence of time and storage conditions

Christian C. Seifarth / Johannes Miertschischk / Eckhardt G. Hahn / Johannes Hensen
Published Online: 2005-06-01 | DOI: https://doi.org/10.1515/CCLM.2004.150

Abstract

Background: The precise measurement of osmolality is crucial in the differential diagnosis of disorders of water balance. Storage conditions, and freezing and thawing of serum or plasma samples before osmometry may influence the accuracy of measured values. Methods: A series of serum and plasma samples of 25 healthy young individuals were stored under different conditions at different temperatures (room temperature (22°C), 7°C, –21°C, –78°C) for up to 56 days. Before freezing a protein-stabilizing agent (bacitracin) was added to one part of the samples. Osmolality was examined using the freezing point method. Results: At room temperature osmolality was stable for up to 3 days but showed a tendency toward an increase that was significant on day 14. In contrast, at 7°C an initial significant decrease in serum osmolality occurred (day 1), which was followed by a slow increase. Serum samples stored at –21°C showed a significantly lower osmolality on the 14th day compared to baseline. Adding bacitracin before freezing reduced this decrease by more than half, but the deviation was still significant. In samples stored at –78°C no significant alteration of osmolality from baseline was observed over the observation period of 56 days if samples were thawed in a 37°C water bath. Conclusion: Immediate measurement of osmolality is most reliable in order to obtain accurate values, although storing at room temperature does not influence osmolality significantly during the first 3 days. If storage is necessary for longer, samples should be stored at –78°C and must be thawed quickly (at 37°C). Under these conditions reliable values can be obtained from frozen serum or plasma. Storage at 7°C is not recommended. If samples are stored at –21°C the addition of a protein-stabilizing agent may be useful.

Keywords: diabetes insipidus; osmolality; syndrome of inadequate secretion of antidiuretic hormone (SIADH); storage

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About the article

Corresponding author: Dr. med. Christian Seifarth, Medizinische Klinik 1, Friedrich-Alexander-Universität Erlangen Nürnberg, Ulmenweg 18, 91054 Erlangen, Germany. Phone: +49-9131-8535000, Fax: +49-9131-8535224, E-mail:


Received: 2004-02-23

Accepted: 2004-06-15

Published Online: 2005-06-01

Published in Print: 2004-08-01


Citation Information: Clinical Chemistry and Laboratory Medicine (CCLM), ISSN (Online) 1437-4331, ISSN (Print) 1434-6621, DOI: https://doi.org/10.1515/CCLM.2004.150.

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