HbA1c Retest Reminders: How One Lab Recovered ₹2.8L in Quarterly Repeat Revenue
Automated 12-week retest reminders for diabetic and pre-diabetic patients turned a leaking chronic panel cohort into a predictable revenue stream.
₹2.83L
recovered quarterly revenue
One test category
98
patients reactivated
of 340 due for retest
29%
retest conversion rate
vs. 8% without reminders
3
messages per patient
0% opt-out rate
Executive summary
A diagnostic center in Mumbai's western suburbs had 340 HbA1c patients from the previous quarter who had not returned for their 3-month retest. Each missed retest represented a ₹850 test plus the downstream tests that often accompany it. ReviewsFlow built an automated 12-week reminder sequence — three messages per patient — and recovered 98 bookings in one quarter, generating ₹2.83 lakh in retest and associated revenue.
The challenge
340 diabetic patients whose 3-month window had lapsed — silently
The lab had a large HbA1c volume — about 110 tests per month. They knew from their LIMS that many patients were due for a 3-month retest but had no outreach system. Calling 300+ patients manually was impossible. Their front desk team had tried ad hoc reminders but the effort was inconsistent and unmeasured. Each quarter, the majority of those patients simply booked elsewhere or skipped the test.
What ReviewsFlow built
ReviewsFlow created a cohort-based reminder sequence: Week 11 (one week before due), Week 12 (due week), and Week 13 (one week overdue). Each message was personalised with the patient's name, their last test date, and a brief summary of why timely retesting matters for HbA1c. The third message offered a home collection option as a final convenience nudge.
Why three messages worked without feeling spammy
The key was relevance, not persistence. Message 1 was a warm heads-up — 'Your 3-month HbA1c window is coming up.' Message 2 was the reminder — 'Your test is due this week.' Message 3 was a one-time convenience offer — 'We can send a phlebotomist to your home.'
Because each message had a clear clinical reason to exist, there were zero opt-outs across the 340-patient cohort. Patients perceived the reminders as useful healthcare communication, not promotional spam.
The downstream lift nobody expected
Of the 98 patients who booked, 61 also added a Fasting Lipid Profile or a CBC when they came in — tests commonly recommended for diabetic monitoring. The average ticket rose from ₹850 to ₹2,890, meaning the actual revenue recovery was significantly higher than the HbA1c test alone.
Results
Before ReviewsFlow, those 340 patients were just numbers in our LIMS. Now they come back on time, and half of them add another test. It pays for itself in week one.
Operations Head, diagnostic center, Mumbai (western suburbs)
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