| Method | Result, mmol/L |
|---|---|
| Venous blood sample without an inhibitor of glycolysis (multiple measurements) | 2.6–3.4 |
| Capillary blood sample (twice daily over 2 wk) | 3.9–5.1 |
| Fasting whole blood sample using a blood gas analyzer | 4.8 |
| Fasting venous blood sample collected in a tube containing sodium fluoride | 4.6 |