Healthy Route Implementation Guide
0.1.0 - ci-build

Healthy Route Implementation Guide, published by Savannah Informatics. This guide is not an authorized publication; it is the continuous build for version 0.1.0 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.savannahghi.org/ig/healthy-route/CodeSystem/hr-measurement Version: 0.1.0
Draft as of 2026-10-11 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)

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

CodeDisplayDefinition
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.
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-hiv HIV, reported The participant reports a diagnosis of HIV. True or false.
history-heart Heart disease, reported The participant reports a diagnosis of heart disease. True or false.
history-traditional Traditional medicine use The participant reports current or previous use of traditional medicine. 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.
fruit-days Days fruit eaten in a usual week 0 to 7.
veg-days Days vegetables eaten in a usual week 0 to 7.
salt-added Salt added at the table How often, on the study's frequency scale.
sugar-drinks Sugar-sweetened drinks How often, on the study's frequency scale.
work-activity Physical activity at work On the study's work activity scale.
activity-days Days of moderate or vigorous activity in a usual week 0 to 7.
activity-minutes Minutes of moderate or vigorous activity on those days 0 to 1440.
seated-hours Hours seated in a usual day 0 to 24.
fruit-veg-5plus Fruit and vegetables eaten five days or more Both day counts at five or more. Derived.
activity-weekly-minutes Weekly minutes of moderate or vigorous activity Days multiplied by minutes. Derived.
activity-who-met WHO physical activity recommendation met 150 minutes a week or more. Derived.
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.
waist-hip-ratio Waist-to-hip ratio Waist circumference over hip circumference. Derived.
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, when the laboratory reported another unit. Derived.
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.
fbc-taken Full blood count taken Whether a full blood count was taken. The count itself is not captured. True or false.
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.