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6. Oxygen concentration in air may cause inaccurate test results. 7. User Variability : hemoglobin test is technique sensitive. Only well trained professionals can operate the test system. Lay person is not recommended to use for self-test. 8. Only capillary finger blood can be used for tests, other specimen such as venous blood may cause inaccurate tests result. 9. The following substances may interfere with test results when at higher level concentration : ascorbic acid, bilirubin, sodium and uric acid. 37
