The Health card on Today shows four vitals from Apple Health and opens a Vitals screen with their history. This article explains what each number means, how the latest day, baseline, and shaded range differ, and which readings depend on how your watch is set up.
01The four readings
The Health card lists HRV in milliseconds, resting heart rate in beats per minute, respiratory rate, and blood oxygen as a percentage. All four show as whole numbers on the card.
HRV is the value Titan uses for today's Recovery. If that is missing, Titan falls back to your 24-hour HRV average, then to your most recent HRV reading. Resting heart rate is the latest reading from the past day, widening to 3 days and then 7 days if nothing is found. Respiratory rate and blood oxygen are the most recent samples in Apple Health.
02Latest day, baseline, and shaded range
Tap the card to open Vitals. The top of the screen has a period picker with 7D, 30D, 60D, and 6M. It starts on 30D, and 6M covers 180 days. Under the picker, four tiles show your most recent recorded value for each vital, followed by Above, Within, or Below and your range for the period.
Each vital then gets its own section with three numbers and a chart.
| Label | What it shows |
|---|---|
| Latest day | The value on the last day of the selected period |
| Baseline | The median of your daily values across the period |
| Change | Latest day minus baseline |
The shaded band on the chart covers the 20th to 80th percentile of your daily values in the period. That is the middle 60% of your days.
Below each chart, Titan prints the number of days with data and the coverage, for example "24 of 30 days available · 80% coverage". Titan draws the baseline and range only when the period has at least 7 days with readings and those readings cover at least 60% of its days. A 7-day period therefore needs a reading on all 7 days. If a vital falls short, the tile says "Range unavailable" and the section says "Personal range unavailable for this period".
03The range is personal
The band describes your own history. It is not a clinical reference range. A reading outside it means the value is unusual for you in that period. It does not diagnose a condition.
The range moves when you change the period. A 7D range reflects last week. A 6M range reflects half a year, so one hard week barely shifts it.
04How Vitals differs from the Recovery baseline
Recovery keeps its own HRV and resting heart rate baselines. You choose that window in onboarding, with 7, 30, or 60 days, and it starts at 60. The Vitals period picker has no effect on Recovery. The Recovery window has no effect on the Vitals baseline or range. The two numbers can differ on the same day because they cover different days. See personal baselines and how the Recovery score works for the Recovery side.
05Readings that depend on settings
Two Titan settings change HRV. Use RMSSD for HRV switches every HRV value from SDNN, Apple's default, to RMSSD. Prioritize Sleep or Mindfulness HRV decides which reading counts as today's HRV on the card. Both sit under Settings > Recovery & Sleep > Recovery Preferences. Reach Settings from the avatar on Today, then You > Settings.
Respiratory rate and blood oxygen come from your watch. Apple Watch records respiratory rate while it tracks your sleep, so you need to wear it to bed with sleep tracking on. Blood oxygen needs the Blood Oxygen measurement turned on in the Watch app on iPhone, and only some Apple Watch models measure it.
A gap in a chart means Apple Health had no reading for that day. Check that the reading exists in the Health app and that Titan has read access. For missing HRV, see HRV not showing. For watch setup, see Apple Watch support.
