TN-PHR: Population Health Registry for 80M beneficiaries
One of India’s largest digital health platforms, built in collaboration with the Google Health AI team, to serve 80 million residents of the State of Tamil Nadu.
12,532 Villages
387 Blocks
38 Districts
1 State
20M screenings in a year
The TN-PHR platform facilitated over 20 million community-based screenings in 2022 alone, with active daily usage by 12,000 frontline workers.
Offline-first
Fully functional with no internet access.
Bilingual
App interfaces were available in Tamil and English
Built-in monitoring and performance analytics
Quantitative performance metrics—such as sync reliability, form completion rates, and error frequencies—were built into the system to enable real-time performance tracking across geographies.
Collaboration-first
Design was informed by qualitative research, regular field visits, and interaction with over 5,000 frontline workers through a dedicated Telegram channel. This feedback loop was critical to improving the app’s usability and accelerating adoption.
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Multi-program
Supported NCD screening, COVID vaccination, COPD screening, at-home physiotherapy, and more.
Overview
The Tamil Nadu Population Health Registry (TN-PHR) is one of India’s largest digital health platforms, built to serve over 80 million residents across the state. Originally designed to support non-communicable disease (NCD) screening and management, the platform evolved into a comprehensive digital backbone for ten major health initiatives—consolidating health data, service delivery, and population enumeration through a single interface.
The initiative, led by the Ministry of Health & Family Welfare, Government of Tamil Nadu, was built on the principle of establishing a “Single Source of Truth” for all health-related events, outcomes, and interventions. Lattice Innovations was selected to co-develop the TN-PHR Android application in collaboration with the Google Health AI team, creating an offline-first, field-tested, and scale-ready system.
Problem Statement
We developed the TN-PHR Android app as the primary interface for Frontline Health Workers (FLHWs) across the state. The app enabled FLHWs to screen and enroll individuals, capture health history, record vitals, and monitor a range of health indicators—online and offline.
Features
NCD screening and cardiac risk profiling
COVID-19 vaccination trackings
At-home rehabilitation data capture
Social determinants of health documentation
Population enumeration and household mapping
Creation, linking, and verification of individual health record
The Ministry of Health needed a robust, scalable digital platform to unify and modernize disability data management.
Impact
The TN-PHR platform facilitated over 20 million community-based screenings in 2022 alone, with active daily usage by more than 12,000 frontline workers. It has helped Tamil Nadu move toward a unified, population-based approach to healthcare delivery—supporting everything from risk stratification and intervention to reporting and decision-making.
The registry’s ability to unify fragmented program silos into a single digital system—and to do so at massive scale—has made it a model for other Indian states and international public health programs.
The TN-PHR project also highlights Lattice’s expertise in:
User-centered design with continuous improvements
National-scale, multilingual Android app development
Offline-first clinical and administrative workflows
Real-time sync, monitoring, and data analytics
Scalable government health system deployments
Capability to build systems that adhere to stringent data privacy and security needs
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