Self-Monitoring of Blood Glucose (SMBG): A Simple Yet Underused Habit in Diabetes

Self-Monitoring of Blood Glucose (SMBG) is one of the simplest yet least practiced habits in diabetes management.

Testing your blood sugar several times a day determines the success of your treatment. The highs and lows during the day, hidden behind the HBA1C value, are detected only through SMBG.

What exactly is SMBG?

It means measuring blood sugar 2–4 times a day using a glucometer. According to the ADA, patients who perform SMBG have 25–30% better control.

Why is SMBG important?

1) It shows how much sugar rises immediately after eating. Post-meal spikes are a major cause of complications, and SMBG helps prevent them.

2) The effect of medicines or insulin is seen immediately, giving a clear signal of what works and what doesn’t.

3) It helps recognize sudden low sugar (Hypo). If detected below 70 mg/dL, hospitalization can be avoided.

4) It shows the impact of exercise on sugar levels, helping decide when and how to exercise.

5) Even if HBA1C is 'normal', SMBG detects hidden spikes. HBA1C is an average, SMBG shows today’s truth.

6) Doctor visits become more useful with notes and readings leading to accurate decisions.

7) Small adjustments at home become easier. If many highs or lows appear in a day, immediate corrections can be made.

When and how often should SMBG be done?

- At least 1–2 times a day: fasting and after any one meal. - Focused monitoring 2–3 days a week. - Depending on circumstances: before/after exercise, when starting new medicine, or if health worsens. - 40–60 strips per month provide enough data for clinical decisions.

Cost savings (the most important point):

- Monthly cost of ₹300–₹500, but saves thousands. - Hospitalization reduced by 20–40%. - The cost of strips in a month is fully compensated by avoiding even a small complication.

How do you do SMBG? On time? Randomly? Or not at all? Please share in the comments.

Dr Ravindra L. Kulkarni, MD, DNB, FSCAI (Cardiology) Just For Hearts