Blood & Metabolic
Metabolic Trends, Without a Needle
How light through your skin hints at blood oxygen and metabolic signals — glucose, uric acid and lipids — as wellness trends, not lab values.
At a glance
- Blood oxygen (SpO2) is read accurately with red and infrared light — the same principle as a fingertip oximeter.
- Glucose, uric acid, lipids appear as day-to-day trends estimated from the optical signal.
- No needles — all of it comes from the light your wearable already shines through the skin.
- What it's for: a lifestyle mirror, not a diagnosis.
The Science
What Light Through Skin Reveals
Your blood is not invisible to light. Red and infrared wavelengths pass through skin and are absorbed differently depending on what the blood is carrying — and that difference is the foundation of wearable blood sensing.
For blood oxygen, the physics is well established: oxygen-rich hemoglobin and oxygen-poor hemoglobin absorb red and infrared light at different rates. A sensor with both red and infrared LEDs reads that ratio and reports SpO2 — a genuine, accurate reading, the same way a hospital finger clip works. Fitaos uses multi-channel PPG for this.
Beyond oxygen, the same optical signal carries subtler metabolic information. Fitaos estimates day-to-day trends for blood glucose, uric acid and blood lipids from how the light scatters and is absorbed in tissue and fluid. These are estimates and trends — a mirror of how your body is responding to sleep, food and stress — not lab-grade numbers, and never a replacement for a blood test.
Why we research this
People change their habits when they can see a response. A gentle, needle-free trend that moves after a heavy week or a good night's sleep is often the nudge that real lab results — taken once a year — can never provide.
What We Track
Reading vs Estimate
| Signal | How Fitaos handles it | What it is NOT |
|---|---|---|
| Blood oxygen (SpO2) | A true reading from red + infrared PPG | A diagnosis of any lung condition |
| Blood glucose trend | An estimated day-to-day trend | A glucometer or CGM value |
| Uric acid trend | An estimated lifestyle trend | A lab uric-acid test |
| Blood lipid trend | An estimated lifestyle trend | A cholesterol blood panel |
The boundary is simple: SpO2 is a reading; the metabolic figures are trends. All are wellness context, not medical results.
In Daily Life
What You Can Do With It
🩸 See lifestyle effects
Notice how a poor night or a rich meal nudges your metabolic trend.
🏔️ Altitude & breathing
SpO2 dips at altitude or during a stuffy night — useful awareness, not alarm.
📄 Talk to your doctor
Bring weeks of trend context to a real check-up.
🔁 Build better habits
A visible response is the best motivator for small, steady changes.
Important — general wellness informationBlood-glucose, uric-acid and lipid figures are wellness trends and estimates. Fitaos devices are not intended to diagnose, treat, cure or prevent any disease, and they are not a substitute for diabetes or cardiac care. Always consult your physician.
How the Leaders Sense Blood
Metabolic Sensing — The Brand Playbook
Blood oxygen is mainstream; wrist glucose is not. Understanding the split explains why Fitaos treats metabolic figures as trends.
Apple, Huawei, Samsung, Garmin — all read blood oxygen (SpO2) with red + infrared light, just like Fitaos.
Dexcom & similar CGMs — the only way to get true glucose values, and they are regulated medical devices worn on the arm.
Oura & WHOOP — focus on HRV, recovery and sleep; they do not attempt wrist blood analysis.
Fitaos — accurate SpO2 plus estimated day-to-day trends for glucose, uric acid and lipids, clearly framed as wellness context rather than lab values.
Across the industry, the line is the same: oxygen is a reading, glucose is medical or nothing. Fitaos stays honest — we show the trend, and we send you to a lab for the truth.
In the GBAND App
Your Blood, In Context
📊 Trend Charts
SpO2 and metabolic trends plotted together so patterns are easy to see.
🤖 AI Insight
Daily analysis explains what a shift in your trend might reflect.
📄 Share-ready
Export a clean view to discuss with your clinician.
👨👩👧 Family Sharing
Keep an eye on a loved one's SpO2 and trends with permission.
Important — wellness informationGBAND provides general wellness information. It is not a medical device and does not diagnose, treat, cure or prevent any disease. Share its reports with your physician as context, not as a replacement for care.
Common Questions
FAQ
Is the blood-glucose reading a real measurement?
No. Fitaos shows a glucose trend estimated from optical signals — a wellness hint about direction, not a lab value. It is not a substitute for a glucometer or CGM, and it is not for managing diabetes.
What is blood oxygen (SpO2)?
SpO2 is the percentage of oxygen carried by your red blood cells. Fitaos reads it with red and infrared light — the same principle as a fingertip pulse oximeter.
Can I rely on these numbers for medical decisions?
No. All metabolic figures here are wellness trends and estimates. For medical decisions, use validated lab tests and follow your clinician's advice.
What are uric acid and blood lipids?
Uric acid relates to gout and kidney load; blood lipids (cholesterol and triglycerides) relate to long-term heart health. Fitaos estimates their day-to-day trend as lifestyle context, not a diagnosis.
Keep Exploring
Related Research
Trademark notice. Apple, Apple Watch, Garmin, WHOOP, Oura, Samsung, Huawei, Fitbit and other brand names are trademarks of their respective owners. References to other products are for general-information comparison only and do not imply endorsement, sponsorship, or affiliation.
Feature comparisons reflect generally available consumer capabilities for illustration only; they are not medical claims and do not imply endorsement of or by any brand. Fitaos features are wellness tools, not medical devices.