To support the drive to digitise healthcare RCPCH has, for the first time ever, developed a Digital Growth Charts API to accurately calculate centiles for a child’s height, weight, head circumference and BMI.
Why has the College produced this API?
For decades, health professionals have plotted growth onto charts printed on paper or card. But this paper workflow is incompatible with the expectation of digital healthcare, personal health records and apps.
By developing a national, web-based API (Application Programming Interface), RCPCH has fundamentally changed the paradigm.
- More on why we've developed the API
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Clinical assessment of children’s growth is hard, because children do not grow linearly. They have growth spurts and plateaus, and because of this their height or weight at any given age is clinically informative only if compared with other children of the same age, to see whereabouts they lie in the ‘normal’ range.
The science behind this process is well established and was pioneered and popularised in the 1990s by statisticians and paediatricians, who created paper lookup charts which enabled the early detection of deviations from normal growth. For decades the state of the art has been plotting growth onto charts printed on paper or card, and many parents will be familiar with the paper growth charts in their child’s Red Book.
Now, however, this paper workflow is outdated and incompatible with the expectation of digital healthcare, personal health records, apps and the Internet of Things.
The challenge with switching to growth charts in a digital form is that the maths behind these charts is complex and the dataset they rely on for calculations is difficult to understand. For this reason, digital growth charts have not been developed by vendors of electronic patient records (EPRs), simply because they cannot justify the upfront costs, difficulty and clinical risk.
By developing the calculations as a national, web-based ‘service’ API (Application Programming Interface) RCPCH has fundamentally changed the paradigm.
No longer will EPR vendors have to separately develop growth chart functionality, at great cost, and slowly. Instead, the RCPCH Digital Growth Charts API provides a decoupled web-service approach, which allows us to ‘do once and share’ – and it has created a single, national, Royal College-validated system for accurate growth charts and related calculations, which EPR suppliers can build into their products at low cost.
By building a complex ‘infrastructural’ calculation like this into a REST API, RCPCH has provided the kind of fundamental basis for innovation in healthcare that the rest of the tech world has benefited from for nearly two decades – pure service APIs like Mapping (e.g. Google Maps), Telephony (e.g. Twilio) and Payments (e.g. Paypal/Braintree) – all of which wrap difficult problems in a low-cost, easy-to-use layer, vastly reducing the cost of innovation, and speeding up development spectacularly.
While the project looks from the outside quite simple, the doors it opens are vast. Using the RCPCH API, even low-computing-power ‘Internet of Things’ devices can benefit from accurate measures of growth, delivered straight to the user. Applications can easily integrate growth charts into their clinician- or parent-facing user interfaces, with minimal complexity and cost, driving up standards everywhere.
Key benefits
- Produced by a multidisciplinary team including clinical paediatrics, health informatics, statistics and software development, as well as childhood growth and nutrition specialists, health visitors and information governance experts
- Designed to make it easy for supplier and Trust implementation teams to build into existing clinical apps and interfaces
- Actively developed and improved in response to user feedback and advances in growth monitoring science
- Standardised open data format for all growth references, allowing research groups to develop specialist or localised growth charts using third party data sets
- Clinically safe: DCB0129 Clinical Safety and registered with MHRA as a Class I Medical Device
Technology and standards
This is what your IT team needs to know!
The digital growth charts have been developed as a national, web-based service API using the following technology and against the following standards:
- Python & Flask, Javascript
- React (for demo client), Semantic UI
- openAPI3.0, Postman
- FHIR, SNOMED-CT
- ISO27001, DCB0129 and DCB0160
- Azure - cloud infrastructure services
- API management layer
Subscriptions and pricing
| Tier | Description | £ per month* | Max API calls per month | Support |
|---|---|---|---|---|
| Free | For the hobbyist or developer looking to experiment with the API | £0 | 250 | Forum |
| Basic | For small organisations - features increased API call quota | £100 | 2,000 | Forum + agreed technical support |
| Intermediate | For intermediate usage of the RCPCH growth charts | £250 | 5,000 | Forum + agreed technical support |
| Advanced | For mid-size organisations - features increased API call quota | £500 | 10,000 | Forum + agreed technical support |
| Enterprise | Features negotiable quota and rate limits | Price on application | Negotiable | Negotiable |
*All prices are subject to VAT. Price for technical support to be discussed and agreed with the Commercial team
Explore the demo and contact us
Want to get in touch to find out more about the API or getting a subscription? Complete our Digital Growth Charts API enquiry form
Want to read more about the products and how the API works? See a demo? Access our Digital Growth Charts API demo