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 |