Estimated Oxygen Variation

[Den_in_USA]

Why is this now available on only some Charge 3 and Versas? 

[David56]

Within a few days of my post I received the update. I didn’t do anything and I didn’t get any assistance from anyone else. 


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[Fabat50plus]

Hi @MarreFitbit, actually I didn't have to go as far as "clear user data".  In the device, I followed the directions @sutherlandws provided and just under it, is "reboot" and that just restarts the device.  No data is lost.  That was enough to get the graph back for me. Thanks everyone!

[Wyzoon]

Thank you for your advice. It is there now, and worked for last night. I had done this a couple days ago, but didn't wear my tracker at night, so not sure if it worked right away - but it works now.

These are the steps I took, in case anyone is reading this.

1. Sync your tracker to your phone app

2. On your tracker settings, restore to factory setting (This only deletes data from your tracker, not your app)

3. Re-hook up your tracker (have to go through set up again)

4. Check under the restore part of your sleep log.

[MarreFitbit]

Hi there @Selvendran, @David56, @Fabat50plus (thanks for clarifying what actually was the fix for the issue 😊) . I'm glad to hear you all are back on track.  

Hello @Wyzoon, thanks for stopping by for and sharing the step-by-step you've done to get your EOV graph back. I'm sure the steps will help other users. 

I'll be here if you have any questions present. 😉

[T.Minkov]

Thats my story:
Received a new Charge 3, upgraded to latest 28.20001.63.5 and started monitoring my HR and Sleep.

3 nights i received blank/empty EOV grpaph.
Jumped to this forum and after long reading i went to:

- Profile: Sync

- Profile: remove Charge 3 device

- Charge 3: Settings | About | Clear User Data

- Charge 3: Settings | About | Reboot Device

- Profile: Add Charge 3 device
On next morning:
- last EOV graph (4th night) is not empty. Data collected

- prev 3 nights - still empty. Maybe data was not collected at all.

Next time I will try the shorter procedure: maybe restart only.

[Selvendran]

I’m not sure restart only will work. 


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[Cosmin]

Hello, 

Is there actually a fix on how to get the EOV table populated?

Not all the described "fixes" are consistent or for long term as for some users the EOV tables stops being populated after a couple of days. Also, is there a way to also check on past nights or the data for those is forever gone? 

I have a fitbit Charge 4. 

[MarreFitbit]

Hi there @Cosmin, thanks for stopping by. I totally understand where you're coming from. If your EOV graphs remains consistently blank (3+ days) but Sleep Stages were recorded, I'll ask you to perform a Factory Reset. However, prior to do it will be necessary to sync your Fitbit devices to make sure all your data be properly transferred.

Once you've done that, please go to your Fitbit's Settings app > About > Factory Reset or Clear User Data.

With regards to your inquiry, you cannot see the EVO graph for those days where you didn't receive it, the data will not return, but you should've received your sleep stages and sleep score from those days. The details can be find in your Fitbit app. 

I'll be around if you have any questions present.

[Selvendran]

Sorry I have a Charge 3 and not in a position to help you. In my experience I have not found answers for your questions. 


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[matildamac]

mine just stopped working this week. how do I get it back?

[Selvendran]

Backup to your computer. Then in Fitbit go yo settings. In settings go down to about. Now clear user data.  Then install like a new device.  


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[Fabat50plus]

The simplest way to try first or what I did (Charge 3):

1) on watch swipe right to left about 4 times until you see "settings" on bottom half of screen

2) tap on "settings" 

3) swipe bottom to top until you reach last screen, that says "about" at bottom

4) tap on "about"

5) swipe again bottom to top about 2 times, until you reach "reboot device"

6) tap on "reboot device"

Follow prompts. My EOV started showing. Just not previous nights... 

Reboot sounded less severe to me.

[matildamac]

thanks for taking the time to reply. I gave it the 8 sec hold on the charger and it seems to have worked. I didn't really want to reboot.

[Selvendran]

Excellent 


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[notonyourtintyp]

Hi LanuzaFitbit,

I just did a Download of my data archive, and when I look at the Estimated Oxygen Variation files I see what seems to be a minute-by-minute series of one data value: Infrared to Red Signal Ratio, ranging from a high of 34 to a low of -111.  How do I interpret these values? Can you give me a link to something that describes the estimation in more detail, and how I interpret a reading as "green" (meaning "good, healthy", right?) or something else?

Thanks!

[notonyourtintyp]

Heartily concur.

I note in the Data Archive of my account that the EOV data only seems to be calculated and saved during sleep. Perhaps somebody clever could write a FitBit Lab App to collect the data all the time, and make it available for offboard SPO2 etc. calculation?

[sutherlandws]

I am curious. How food you download the data, and in what format was it
stored? As for the ratio, my best guess without knowing what wavelengths
they are using, this sounds like they are ratioing two wavelengths that
help pull out blood O2 levels from background variations. As a
spectroscopic, I would be interested in any scientific articles on this.

Scott

[notonyourtintyp]

I had to go through the Fitbit web app (not phone app), Settings, Data Management, where there are options for downloading data for 31 days at a time. But, that's not it.

Further down that screen is an option for a Data Archive of your entire account. I've tried this a few times over the last year or so, and it... is very cranky. I'd hit the request button, nada, nada, never an email reply. I tried two weeks ago, no emails with confirm the download request messages.  Yesterday I went back in and found that it had acknowledge my request from 16 June, so I said "resend email," twice, got two emails from them, clicked one, and started the download. Took about two hours or so.

Once I got the download .zip file, I went into it and started browsing around. In the folder \user-site-export is a wealth of data in folders, all in human-readable metadata-tagged JSON files. And then, a whole slew of .cxv Excel files "estimated-oxygen-variation-yyyy-mm-dd.csv".

As to scientific articles: one such is  Pulse Oximetry with Two Infrared Wavelengths without Calibration in Extracted Arterial Blood

which perhaps goes into too much math, discussion of calibration issues, etc.  The real kicker, though, was at another site https://www.imore.com/how-enable-spo2-monitor-your-fitbit which points out that it took FDA approval for Fitbit to legally be able to turn on the display in the Sleep data area of the app.

So... if you can find an offline app that can process those spreadsheets of .csv data, which seem to be taken once per minute, you've got what you need. Or, if you can interpret the R value meaningfully, all you have to do is display it.

If you figure out that interpretation part, please share.

[EtheP]

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@LanuzaFitbit wrote:

Hello everyone!

As mentioned before, the red and infrared sensors on the back of your Fitbit device capture the data that you see on your estimated oxygen variation (EOV) graph. Although the sensors are components of a relative SpO2 sensor, the graph is not a relative SpO2 estimate.

Your EOV graph is located under sleep stages in the Fitbit app, or, if you’re a premium subscriber, it’s on the Restoration tab under your sleeping heart rate information. If you don’t see your EOV graph, note that:

-You must get sleep stages and wear one of the following Fitbit devices to get the EOV graph: Charge 3, Ionic, and devices in the Versa series. 

-Certain customers began seeing the graph in December 2019. The feature will be available to all customers sometime in 2020.

We hope this answers some questions. 

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It's July 27th and I still don't have the oxygen sensor option for my Charge 3.  Am I missing something or is it still being rolled out?

[EtheP]

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@EtheP wrote:

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@LanuzaFitbit wrote:

Hello everyone!

As mentioned before, the red and infrared sensors on the back of your Fitbit device capture the data that you see on your estimated oxygen variation (EOV) graph. Although the sensors are components of a relative SpO2 sensor, the graph is not a relative SpO2 estimate.

Your EOV graph is located under sleep stages in the Fitbit app, or, if you’re a premium subscriber, it’s on the Restoration tab under your sleeping heart rate information. If you don’t see your EOV graph, note that:

-You must get sleep stages and wear one of the following Fitbit devices to get the EOV graph: Charge 3, Ionic, and devices in the Versa series. 

-Certain customers began seeing the graph in December 2019. The feature will be available to all customers sometime in 2020.

We hope this answers some questions. 

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It's July 27th and I still don't have the oxygen sensor option for my Charge 3.  Am I missing something or is it still being rolled out?

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My bad.  It turns out the readings are tucked inside the sleep readings, way at the bottom.  I do have this feature.