Medically recognized; fingertips or untreated whole blood and venous blood serum physiological values can tolerate ± 15 ~ 20% error <br /> The allowable error between the fingertip blood collection blood glucose meter and clinical serum gold standard biochemical analyzer YSI before 2013 is ± 20%. Although it has been changed to ± 15% since 2013, but possibly due to improper blood collection / squeezing, resulting in unpredictable errors, China and many countries still take ± 20% as the allowable error.