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The page below is a sample from the LabCE course Minimizing Pre-Analytical Variability During Venipuncture, Urine Sample Collection, and Sample Processing. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Freeze-Thaw Cycling

Certain components of interest are sensitive to degradation by the process of multiple freeze-thaw cycles.
One of the more commonly measured enzymes, alanine aminotransferase (ALT), does not withstand multiple freeze-thaw cycles and falsely decreased results may occur.
The immunoglobulins (IgA, IgG, IgM) are also known to decrease upon repeated freeze-thaw cycles, while plasma renin levels are known to increase after repeated freeze-thaw cycles.