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Examples of possible exclusion criteria
| Alcohol consumption | Illness, recent |
| Blood donor | Lactation |
| Blood pressure, abnormal | Obesity |
| Drug abuse | Occupation |
| Drugs, prescription | Oral contraceptives |
| Drug, over the counter | Pregnancy |
| Environment | Surgery, recent |
| Fasting or non-fasting | Tobacco use |
| Genetic factors | Transfusion, recent |
| Hospitalization, current/recent | Vitamin abuse |
Adapted from CLSI document EP28-A3c [2].