1. Misidentification of patient

2. Mislabeling of specimen

3. Wrong anticoagulant

4. Mixing problems

5. Wrong tubes

6. Hemolysis and lipemia

7. Hemoconcentration

8. Extreme temperature

9. Improperly timed specimen

10. Processing errors:

 Incomplete centrifugation

 Incorrect log-in

 Improper storage