Healthy Route Implementation Guide
0.2.0 - ci-build

Healthy Route Implementation Guide, published by Savannah Informatics. This guide is not an authorized publication; it is the continuous build for version 0.2.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/savannahghi/healthy-route-ig/ and changes regularly. See the Directory of published versions

CodeSystem: Healthy Route Measurement Codes

Official URL: https://fhir.optimalhealth.org/ig/healthy-route/CodeSystem/hr-measurement Version: 0.2.0
Draft as of 2026-11-12 Computable Name: HRMeasurementCS

Codes for the questions on the visit forms that LOINC does not cover, and for the values the study derives from them.

This Code system is referenced in the content logical definition of the following value sets:

  • This CodeSystem is not used here; it may be used elsewhere (e.g. specifications and/or implementations that use this content)

Properties

This code system defines the following properties for its concepts

NameCodeURITypeDescription
Status status http://hl7.org/fhir/concept-properties#status code Retired for a code no form asks any more. It stays in the system so that answers recorded with it keep their meaning.

Concepts

This case-sensitive code system https://fhir.optimalhealth.org/ig/healthy-route/CodeSystem/hr-measurement defines the following codes:

CodeDisplayDefinitionStatus
age-at-consent Age at consent Completed years on the date consent was given, calculated from the date of birth. Derived.
capable-of-consent Capable of giving signed informed consent Inclusion criterion. True or false.
documented-egfr Documented eGFR An eGFR documented by the referring service before the visit, as the record shows it. Distinct from the eGFR the study calculates from its own creatinine.
excl-undesirable Condition making participation undesirable Exclusion criterion, in the investigator's opinion. True or false.
excl-eye-condition Eye condition precluding retinal imaging Exclusion criterion. True or false.
excl-emergency Hypertensive, hyperglycaemic or hypoglycaemic emergency Exclusion criterion. True or false.
excl-involvement Involvement in the planning or conduct of the study Exclusion criterion. True or false.
excl-noncompliance Unlikely to comply with study procedures Exclusion criterion. True or false.
eligibility-outcome Eligibility outcome The outcome the rules in force computed from the criteria. Derived.
cohort Cohort Case or control, assigned from the documented eGFR. Derived.
recruitment-clinic Clinic The clinic the participant was attending when recruited, on the study's clinic list.
ethnicity Ethnicity As the participant reports it, on the country's list. A group the list does not name is answered other, with the group as text.
domicile Type of domicile Urban or rural.
history-dm Diabetes, reported The participant reports a diagnosis of diabetes. True or false.
history-htn Hypertension, reported The participant reports a diagnosis of hypertension. True or false.
history-ckd Chronic kidney disease, reported The participant reports a diagnosis of chronic kidney disease. True or false.
history-alcohol Alcohol use Current, past or nil. LOINC codes the quantity of alcohol, not whether a person drinks, so the status takes a local code.
medications-none No current medication The participant takes no medication at present. Recorded so that an absent medication list is distinguishable from one not yet taken.
bp-position Blood pressure reading position Whether the reading was taken before or after retinal capture, for the reading the protocol allows either side of it. Carried on the reading as an extension.
bp-device Blood pressure monitor Which of the study's monitors took the reading. Carried on each reading as an extension.
retinal-capture-time Time of retinal capture When retinal photography finished. The blood pressure readings are timed relative to it.
flag-hypertension Hypertension flag Raised readings, a reported history or current antihypertensive treatment. Derived.
flag-t2d Type 2 diabetes flag HbA1c above threshold or a reported history. Derived.
flag-ckd-stage-3 CKD stage 3 or worse flag Calculated eGFR below 60. Derived.
creatinine-converted Serum creatinine, converted The creatinine in mg/dL as the eGFR equation used it: as reported when the laboratory reported mg/dL, divided by 88.4 when it reported umol/L. Derived.
egfr-age Age used for the eGFR Completed years on the visit date, from the participant's date of birth. Derived.
egfr-sex Sex used for the eGFR The participant's administrative gender as the record holds it. The equation takes female or male; any other value gives no eGFR.
images-dilated Images taken with dilation True or false.
images-right Image captured of the right eye True or false.
images-left Image captured of the left eye True or false.
images-synced Images synced to the device cloud storage True or false.
established-ckd Established CKD diagnosis Inclusion criterion: chronic kidney disease diagnosed at the participant's clinic, with an eGFR below 60 mL/min/1.73m2 persisting for 3 months or more. Admits a participant whose dipstick is negative where the protocol makes the dipstick decisive. True or false. retired
history-hiv HIV, reported The participant reports a diagnosis of HIV. True or false. retired
history-heart Heart disease, reported The participant reports a diagnosis of heart disease. True or false. retired
history-traditional Traditional medicine use The participant reports current or previous use of traditional medicine. True or false. retired
fruit-days Days fruit eaten in a usual week 0 to 7. retired
veg-days Days vegetables eaten in a usual week 0 to 7. retired
salt-added Salt added at the table How often, on the study's frequency scale. retired
sugar-drinks Sugar-sweetened drinks How often, on the study's frequency scale. retired
work-activity Physical activity at work On the study's work activity scale. retired
activity-days Days of moderate or vigorous activity in a usual week 0 to 7. retired
activity-minutes Minutes of moderate or vigorous activity on those days 0 to 1440. retired
seated-hours Hours seated in a usual day 0 to 24. retired
fruit-veg-5plus Fruit and vegetables eaten five days or more Both day counts at five or more. Derived. retired
activity-weekly-minutes Weekly minutes of moderate or vigorous activity Days multiplied by minutes. Derived. retired
activity-who-met WHO physical activity recommendation met 150 minutes a week or more. Derived. retired
hip-circumference Hip circumference In centimetres. LOINC publishes a protocol code for hip circumference but not a measurement code, so the measurement takes a local one. retired
waist-hip-ratio Waist-to-hip ratio Waist circumference over hip circumference. Derived. retired
hiv-test HIV test result Reactive or non-reactive, as the laboratory reports it. The test method is not captured, so no LOINC code asserting one is used. retired
fbc-taken Full blood count taken Whether a full blood count was taken. The count itself is not captured. True or false. retired