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Casual or systematic errors occurring in pre-analytical, analytical or post-analytical phases influence laboratory test results. The areas where pre-analytical phase errors most often arise are: timing of specimen collection; selection of specimen type; and time and temperature of storage/transport. Bone turnover markers are clinically useful in evaluating bone metabolism. Although unquestionably valuable tools, little is known about the pre-analytical precautions for their correct use and there is no consensus on kind of sample, or storage time and temperature before analysis. Moreover, biological variability, because of uncontrollable and controllable factors, will affect pre-analytical variability. Serum should be preferred to simplify blood drawing; therefore, only one tube should be used for the analysis of all bone markers. Short-term storage at 4°C may be advisable to preserve stability, immediate storage at –70°C is recommended for longer periods, while avoiding repeated freeze-thawing cycles. Sampling should be performed in the morning in fasting subjects who have abstained from physical exercise for 24 h. This review aimed to give a knowledge update on pre-analytical phase precautions in performing bone turnover marker measurement.

Blood biochemical markers of bone turnover: pre-analytical and technical aspects of sample collection and handling