Precision Requires FHIR

by Barry P Chaiken, MD

On February 25th President Obama at the White House celebrated the one year anniversary of his announcement of the Precision Medicine Initiative. The Initiative, first announced in the President’s State of the Union Address last year, initially invested $215 million in this research approach.

Most medical treatments are designed to treat the average patient. This broad approach fails to account for the differences in genetics, physiology, environments, and lifestyles that greatly impact the effectiveness of therapies. Precision medicine works to overcome these shortcomings by conducting research into the efficacy of the available treatments in different patients using these and additional factors.

For example, Warfarin, a drug used in anticoagulation therapy for patients who need to prevent blood clots from forming (e.g., patients with implanted heart valves or who recently suffered a stroke), showcases the value of precision medicine research. Not to get too technical, the CYP2C9 gene encodes one of the main enzymes involved in the metabolism of Warfarin. In addition, there are several variants of the gene that reduce the enzyme activity, therefore impacting how quickly the drug is metabolized. The speed it is metabolized, affects the length of time after a dose is taken that the drug is effective as an anticoagulant.

Typically, physicians prescribe Warfarin at an average dose. They then conduct multiple lab tests (i.e., blood draws) to adjust the dose up or down depending upon the individual patient’s efficiency in metabolizing the Warfarin as determined by the patient’s variant of the CYP2C9 gene. The titration process can take several weeks as the dose is adjusted. In the meantime, the patient is put at risk for clotting – too little Warfarin – or excessive bleeding – too little Warfarin.

Application of a precision medicine approach would short circuit this currently acceptable methodology used to determine appropriate Warfarin therapy. As precision medicine takes into account the genetic makeup of patients, in addition to other factors, clinicians applying this medical research would start patients on the proper Warfarin dose at the beginning of therapy rather than needing to employ a trial and error approach to discover the correct dose. Warfarin is just one of many drugs where genetic makeup impacts metabolism.


Precision medicine research requires patient information that up until recently was locked up in paper records that proved too difficult and expensive to extract. With passage of the HITECH act facilitating the deployment of electronic medical records (EMRs), this valuable patient information is now digitized and available for use by researchers.

Unfortunately like paper records, the failure to foster true interoperability as part of the Meaningful Use criteria used to guide EMR implementation left the industry with valuable data locked up in proprietary formats and incompatible data definitions. Although CCD and CCD-A standards allowed for some degree of interoperability, these formats transfer information in large bundles rather than discreet elements more useful to researchers.

Which brings us to HL-7’s proposed FHIR® (Fast Healthcare Interoperability Resources) specification. HL7’s release of the proposed FHIR standard (Welcome to FHIR, 2015) attempts to unlock the data within EMRs and make it available for other applications to utilize.

FHIR’s ability to isolate and describe the data elements frees the data from the singular clinical database for a wide variety of uses. Using an application program interface (API) to access the data, innovative developers can create standalone applications that utilize FHIR-enabled data elements to deliver information to patients and clinicians independent of the EMR. The developers use metadata embedded in the data element to intelligently “route” the data making applications much smarter and useful than they would be without FHIR. Rather than having the data imprisoned by the predetermined structure, workflow, and user interface of the EMR, applications can be developed that satisfy the specific needs of both clinical staff and patients. (FHIRed Up)


FHIR is the key to driving the Precision Medicine Initiative. If widely adopted, it can facilitate the transfer of patient information on a scale that allows stratification of populations by genetics and other factors. By extracting only the key data elements required in a standardized interoperable format, rather than an entire patient record burdened by a proprietary data structure, FHIR allows the rapid construction of a problem specific clinical database that can be quickly analyzed. The content within the data set contains only those data elements of interest to researchers such as age, sex, ethnicity, genetic markers, diagnosis, and laboratory results.

Using our earlier example, FHIR could be used to construct a Warfarin response data set that contains CYP2C9 results combined with demographics, diagnosis and other factors. Using this data, researcher could explore the relationship among characteristics such as the CYP2C9 gene variants, diagnosis, age, sex, BMI, ethnicity, and Warfarin dose. Such results would drive protocols to be used on patients that are candidates for Warfarin anticoagulation therapy.

People Power

Last month the President announced an additional $200 million for the Precision Medicine Initiative. The National Institutes of Health NIH), the Department of Health and Human Services, the Department of Veteran Affairs, and the Department of Defense already are engaged in projects to advance this initiative.

Specifically, the NIH, in conjunction with the Office of the National Coordinator for Healthcare Information Technology (ONC), sees FHIR as a technology that would allow individual patients to withdraw their own medical information directly from EMRs and make it available to the NIH for medical research. This clearly is an important component of the Vice President’s Cancer Moonshot program.

Technologies to FHIR enable EMRs through an API are currently under development by EMR and interoperability vendors. It is unknown how the EMR vendors, who have a tight technology leash on their provider clients, intend to roll-out their FHIR API. Options include embedding it in an upgrade or releasing it as a bolt on application, and the potential cost worries many provider organizations who initially spent huge sums implementing their EMRs.

Non-EMR vendors see a short 12 month window to develop the technology and beat the EMR vendors to market. The potential revenue is huge. Even bigger is the impact FHIR can have on the delivery of precision medicine and improved healthcare for all of us.


  1. Welcome to FHIR®. (2015, October 24). Retrieved from
  2. (03/11/2016)
  3. Chaiken BP. FHIRed Up. PSQH XXX YYY

Excerpts from “Precision Requires FHIR” published in Patient Safety and Quality Healthcare and “New Standards Can FHIR Up Precision Medicine” published in Health Data Management

Leave a comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.