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. 2015 Oct;7(10):E395–E401. doi: 10.3978/j.issn.2072-1439.2015.10.03

Table 1. The leading causes of pre-analytical variability.

Patient preparation
  Fasting status
  Exercise
  Posture
Blood drawing
  Misidentification
  Insufficient volume
  Hemolysis
  Contamination
  Venous stasis
  Blood collection devices
  Mixing
Sample transportation and preparation
  Time, temperature, integrity
  Centrifugation