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Blood Glucose Indexes

Blood glucose index (BGI) values are risk indicators for hypoglycaemia and hyperglycaemia probability.
 Risk LBGIHBGI
 Minimal ≤ 1.1 
 Low > 1.1 – ≤ 2.5 4.5
 Moderate > 2.5 – ≤ 5.0> 4.5 – ≤ 9.0
 High > 5.0> 9.0
Usually, the farther the Blood Glucose Index is from the safe area, the higher is the risk potential for low or high glycaemic levels.
  • Low blood glucose index (LBGI) indicates the probability for hypoglycaemia 
  • High blood glucose index (HBGI) indicates the probability for hyperglycaemia
Blood Glucose Variability is important measure because it provides additional clarification for HbA1c value. HbA1c shows the blood glucose average for the last 3-4 months but the good HbA1c could be a result of very high and very low blood sugar levels which large variability must be avoided by all means. For variability index iDiabetes:M is chosen the average daily Blood Glucose Standard Deviation (BGSD) for the selected time interval.

The variability risk estimation is as follows:

 σ = Blood Glucose Standard Deviation of glucose readings x1x2, ..., xN  where 

GLHypo ‒ Hypoglycaemia Limit 
GLLow ‒ Glucose Low Limit
GLHigh ‒ Glucose High Limit 
GLHyper ‒ Hyperglycaemia Limit
 Risk Variability = 2*σ
 Low variability ≤ [GLHigh - GLLow]
 Moderate [GLHigh - GLLow] ≤ variability ≤ [GLHyper - GLHypo]
 High variability > [GLHyper - GLHypo]