HealthKit supports over 100 quantity type identifiers for tracking various health and fitness metrics. This page documents all available identifiers, organized by category.Documentation Index
Fetch the complete documentation index at: https://mintlify.com/kingstinct/react-native-healthkit/llms.txt
Use this file to discover all available pages before exploring further.
Activity & Fitness
Steps & Distance
Number of steps taken. Unit:
countDistance traveled while walking or running. Unit:
m, ft, mi, kmDistance traveled while cycling. Unit:
m, ft, mi, kmDistance traveled in a wheelchair. Unit:
m, ft, mi, kmDistance traveled while swimming. Unit:
m, ft, mi, kmDistance traveled during downhill snow sports. Unit:
m, ft, mi, kmDistance traveled while cross-country skiing. Unit:
m, ft, mi, kmAvailable on iOS 18+
Distance traveled during paddle sports. Unit:
m, ft, mi, kmAvailable on iOS 18+
Distance traveled while rowing. Unit:
m, ft, mi, kmAvailable on iOS 18+
Distance traveled during skating sports. Unit:
m, ft, mi, kmAvailable on iOS 18+
Energy & Activity Time
Active energy burned during activity. Unit:
kcal, kJ, CalBasal (resting) energy burned. Unit:
kcal, kJ, CalExercise time as measured by Apple Watch. Unit:
minStand time as measured by Apple Watch. Unit:
minMove time for users in wheelchair mode. Unit:
minAvailable on iOS 14.5+
Exercise Metrics
Number of flights of stairs climbed. Unit:
countNumber of wheelchair pushes. Unit:
countNumber of swimming strokes. Unit:
countMaximum oxygen consumption during exercise. Unit:
mL/(kg·min)Nike Fuel points earned. Unit:
countRunning Metrics
Running speed. Unit:
m/s, km/h, mi/hAvailable on iOS 16+
Running power output. Unit:
WAvailable on iOS 16+
Running stride length. Unit:
m, ftAvailable on iOS 16+
Vertical oscillation while running. Unit:
cm, inAvailable on iOS 16+
Ground contact time while running. Unit:
msAvailable on iOS 16+
Cycling Metrics
Cycling speed. Unit:
m/s, km/h, mi/hAvailable on iOS 17+
Cycling power output. Unit:
WAvailable on iOS 17+
Cycling cadence (pedal revolutions). Unit:
count/minAvailable on iOS 17+
Functional threshold power for cycling. Unit:
WAvailable on iOS 17+
Other Sports
Cross-country skiing speed. Unit:
m/s, km/h, mi/hAvailable on iOS 18+
Paddle sports speed. Unit:
m/s, km/h, mi/hAvailable on iOS 18+
Rowing speed. Unit:
m/s, km/h, mi/hAvailable on iOS 18+
Workout Effort
Physical effort score. Unit:
countAvailable on iOS 17+
Workout effort score. Unit:
countAvailable on iOS 18+
Estimated workout effort score. Unit:
countAvailable on iOS 18+
Body Measurements
Body weight. Unit:
kg, lb, stBody mass index (BMI). Unit:
countBody fat percentage. Unit:
%Lean body mass. Unit:
kg, lb, stHeight. Unit:
m, cm, ft, inWaist circumference. Unit:
m, cm, ft, inVital Signs
Heart
Heart rate. Unit:
count/minResting heart rate. Unit:
count/minAverage heart rate while walking. Unit:
count/minAvailable on iOS 11+
Heart rate variability (SDNN). Unit:
msAvailable on iOS 11+
Heart rate recovery after one minute. Unit:
count/minAvailable on iOS 16+
Atrial fibrillation burden percentage. Unit:
%Available on iOS 16+
Blood Pressure
Systolic blood pressure. Unit:
mmHgDiastolic blood pressure. Unit:
mmHgRespiratory
Respiratory rate. Unit:
count/minBlood oxygen saturation. Unit:
%Peripheral perfusion index. Unit:
%Temperature
Body temperature. Unit:
degC, degFBasal body temperature. Unit:
degC, degFSleeping wrist temperature (Apple Watch). Unit:
degC, degFAvailable on iOS 17+
Water temperature. Unit:
degC, degFAvailable on iOS 16+
Laboratory & Clinical
Blood Glucose
Blood glucose level. Unit:
mg/dL, mmol/LBlood ketone level. Unit:
mmol/LInsulin delivery amount. Unit:
IUAvailable on iOS 11+
Other Lab Values
Blood alcohol content. Unit:
%Electrodermal activity (skin conductance). Unit:
S (siemens)Respiratory Function
Forced vital capacity. Unit:
LForced expiratory volume in 1 second (FEV1). Unit:
LPeak expiratory flow rate. Unit:
L/minNumber of inhaler puffs. Unit:
countNutrition
Macronutrients
Dietary energy consumed. Unit:
kcal, kJ, CalProtein consumed. Unit:
g, mg, μgCarbohydrates consumed. Unit:
g, mg, μgDietary fiber consumed. Unit:
g, mg, μgSugar consumed. Unit:
g, mg, μgTotal fat consumed. Unit:
g, mg, μgSaturated fat consumed. Unit:
g, mg, μgMonounsaturated fat consumed. Unit:
g, mg, μgPolyunsaturated fat consumed. Unit:
g, mg, μgCholesterol consumed. Unit:
g, mg, μgVitamins
Vitamin A consumed. Unit:
g, mg, μgVitamin B6 consumed. Unit:
g, mg, μgVitamin B12 consumed. Unit:
g, mg, μgVitamin C consumed. Unit:
g, mg, μgVitamin D consumed. Unit:
g, mg, μgVitamin E consumed. Unit:
g, mg, μgVitamin K consumed. Unit:
g, mg, μgThiamin (Vitamin B1) consumed. Unit:
g, mg, μgRiboflavin (Vitamin B2) consumed. Unit:
g, mg, μgNiacin (Vitamin B3) consumed. Unit:
g, mg, μgFolate consumed. Unit:
g, mg, μgBiotin consumed. Unit:
g, mg, μgPantothenic acid consumed. Unit:
g, mg, μgMinerals
Calcium consumed. Unit:
g, mg, μgIron consumed. Unit:
g, mg, μgMagnesium consumed. Unit:
g, mg, μgPhosphorus consumed. Unit:
g, mg, μgPotassium consumed. Unit:
g, mg, μgSodium consumed. Unit:
g, mg, μgZinc consumed. Unit:
g, mg, μgIodine consumed. Unit:
g, mg, μgSelenium consumed. Unit:
g, mg, μgCopper consumed. Unit:
g, mg, μgManganese consumed. Unit:
g, mg, μgChromium consumed. Unit:
g, mg, μgMolybdenum consumed. Unit:
g, mg, μgChloride consumed. Unit:
g, mg, μgHydration & Other
Water consumed. Unit:
mL, L, fl_oz_us, fl_oz_imp, cup_us, cup_impCaffeine consumed. Unit:
g, mg, μgMobility
Walking speed. Unit:
m/s, km/h, mi/hAvailable on iOS 14+
Walking step length. Unit:
m, cm, ft, inAvailable on iOS 14+
Walking asymmetry percentage. Unit:
%Available on iOS 14+
Walking double support percentage. Unit:
%Available on iOS 14+
Stair ascent speed. Unit:
m/s, ft/sAvailable on iOS 14+
Stair descent speed. Unit:
m/s, ft/sAvailable on iOS 14+
Distance walked in six-minute walk test. Unit:
m, ft, mi, kmAvailable on iOS 14+
Apple Walking Steadiness score. Unit:
%Available on iOS 15+
Environmental
UV exposure index. Unit:
countTime spent in daylight. Unit:
minAvailable on iOS 17+
Environmental audio exposure. Unit:
dBASPLAvailable on iOS 13+
Headphone audio exposure. Unit:
dBASPLAvailable on iOS 13+
Environmental sound reduction (e.g., from hearing protection). Unit:
dBASPLAvailable on iOS 16+
Other Health Metrics
Number of falls detected. Unit:
countNumber of alcoholic beverages consumed. Unit:
countAvailable on iOS 15+
Underwater depth. Unit:
m, ftAvailable on iOS 16+
Sleeping breathing disturbances. Unit:
countAvailable on iOS 18+
Read-only vs Writeable
Most quantity types are writeable, meaning third-party apps can save data to them usingsaveQuantitySample(). However, some types are read-only and can only be written by Apple’s own apps and devices:
HKQuantityTypeIdentifierAppleExerciseTimeHKQuantityTypeIdentifierAppleStandTimeHKQuantityTypeIdentifierWalkingHeartRateAverageHKQuantityTypeIdentifierAppleWalkingSteadinessHKQuantityTypeIdentifierAtrialFibrillationBurden
QuantityTypeIdentifierWriteable and QuantityTypeIdentifierReadOnly.
iOS Version Availability
Some quantity types are only available on newer iOS versions:- iOS 11+: Heart rate variability, insulin delivery, walking heart rate average
- iOS 13+: Environmental and headphone audio exposure
- iOS 14+: Mobility metrics, six-minute walk test
- iOS 14.5+: Apple Move Time
- iOS 15+: Walking steadiness, number of alcoholic beverages
- iOS 16+: Running metrics, heart rate recovery, underwater depth, water temperature, environmental sound reduction
- iOS 17+: Cycling metrics, time in daylight, physical effort, sleeping wrist temperature
- iOS 18+: Additional distance sports, workout effort scores, sleeping breathing disturbances