47% samples tested for HbA1c in Kolkata found to be Diabetic

SRL Diagnostics prepared a Data Analytics Report on results of randomized samples received for Glycosylated/ Glycated Hemoglobin (HbA1c) from January 2017 till September 2021 in the city of Kolkata. This report has been prepared on the basis of a retrospective data mining done on results of1, 03,157 tests done for HbA1c.

A report published in 2009 by an International Expert Committee on the role of HbA1c in the diagnosis of diabetes recommended that HbA1c can be used to diagnose diabetes and that the diagnosis can be made if the HbA1c level is ≥6.5%. Levels of HbA1c just below 6.5% may indicate the presence of intermediate hyperglycaemia. The precise lower cut-off point for this has yet to be defined, although the ADA (The American Diabetes Association) has suggested 5.7 – 6.4% as the high-risk range. While recognizing the continuum of risk that may be captured by the HbA1c assay, the International Expert Committee recommended that persons with an HbA1c level between 6.0 and 6.5% were at particularly high risk and might be considered for diabetes prevention interventions.

  • For people without diabetes, the normal range for the HbA1c level is less than 5.7%.
  • HbA1c levels between 5.7% and 6.4% mean one has a higher chance of getting diabetes (pre-diabetes).
  • Levels of 6.5% or higher mean one has diabetes.
  • Diabetics who keep their hemoglobin A1c levels close to 7% have a much better chance of delaying or preventing diabetes complications than people with levels 8% or higher.

Speaking on the data analytics report for Glycosylated/ Glycated Hemoglobin (HbA1c) conducted inKolkataDr. Chaitali Ray, Chief Biochemist, SRL Diagnostics, Saltlake Kolkata, said “One in six people with Diabetes in the world is from India. As of 2019, India had the second-highest number of diabetes patients aged between 20 and 79 years with close to 77 million living with diabetes. In our analysis for the city of Kolkata, we have found that amongst the 31 and 45 age group a staggering 37% samples were diagnosed with prediabetes and 34% are diabetic.Early diagnosis, extensive awareness and lifestyle interventions are required to keep our future generations healthier.”


Some key findings for the city of Kolkata

  • 47% of all samples tested were found to be diabetic and 36% tested were diagnosedwithprediabetes
  • In 2020, due to the COVID – induced lockdown, a 33% drop was observed in samples tested for diabetes
  • 51% of samples from males and 42% samples from females were found to be diabetic
  • 35% of samples from males and 36% samples from females were diagnosed withprediabetes


Summary of findings from the study are as below:

  1. Out of the 1, 03, 157samples tested in Kolkata during the data analysis period, 42% tested positive for diabetes and over 37% were diagnosed with Prediabetes


City Normal Prediabetes Diabetes
Kolkata 17% 36% 47%


  1. Kolkata witnessed a 22% increase in number of samples tested for diabetes between 2017 and 2019. However during the pandemic the number of samples tested for diabetes dropped by 33% in 2020.


  1. In Kolkata, 51% samples from males and 42% from females were found to be diabetic. 35% samples from males and 36% from females were found to be prediabetic
Kolkata Male (in %) Female (in %)
Normal 14 21
Pre Diabetes 35 36
Diabetes 51 42



  1. The data analysis study shows a high burden of diabetes amongst the healthy and young population between age group 31-45. Over 37% samples were diagnosed with prediabetes and a whopping 34% were found to be diabetic.


Age Group Normal (in %) Prediabetes (in %) Diabetes (in %)
16 – 30 58 29 13
31 – 45 29 37 34
46 – 60 10 36 54
61 – 85 8 35 56
85+ 13 43 45



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