xBT placement and temperature readings

I’ve read the various topics on the xBT in this here forum, and I’ve watched a few videos on Youtube, but I have a few questions left:

  • On the few videos showing people getting an xBT implanted and then using it, it seems to me the people have the chip implanted in the wrong location. Like this lady: she clearly has the chip implanted at the front of her arm instead of on the inside, as recommended in @amal’s not-so-unisex recommended xBT placement chart photoshop job. Does this explain why the video shows the Halo reader reading 93 degrees, which is way off 98.6, and really quite sadly off the mark.

  • If the xBT is placed where Amal recommends it and the wearer keeps their arm down long enough before taking a reading, how many degrees lower than the actual body core temperature should it read? Is the relationship between real vs xBT temperature linear? The Destron Fearing spec sheet says it is - 3 degrees lower across the range in a horse.

  • Why should the armpit itself be avoided as an implant site, apart from the fact that it might not be ideal to walk with crutches?

  • Out of curiosity, have other “exotic” implant sites been tried? Specifically, I’m thinking somewhere in the mouth, possibly in the tongue which, aside from the probably unbearable pain when injecting the chip, might yield more accurate temp readings. Or possibly between the legs. No way I’d be implanting anywhere there - mouth or legs - but I’m curious.

  • Finally, I understand the Bio-Thermo Lifechip reports the temperature in the 24 application bits specified in the FDX datagram. I deduce the Halo reader is specifically programmed to interpret this value as a temperature value in C multiplied by 10 whenever it encounters it in a FDX chip. Or said another way, if it find a value in the application bits, it assumes it’s a Bio-Thermo chip. Does this mean that chip is the only of its kind to make use of these bits? Is there a list of FDX readers that work the same way and report a temperature?

what do you mean? i always look exactly like that when i put my arm up :wink:

basically yes… there will always be some delta between “core” temp and extremities, even if the chip is placed on the inside of the arm… but one hopes that this delta is constant and linear and easily calibrated for… which is harder and harder to guarantee the smaller and further away the extremity gets.

the problem is the term “core”… even with a thermometer in your mouth, you are not getting “core” temperature… it’s a misnomer that has creeped into the lexicon. To get a “core” temperature, you at least need a rectal thermometer, or at best a thermometer centered in your thorax… somehow… so achieving “core” temp is not a practical goal… what you want to do is look for a place that gives you a stable temperature, then look for big changes.

For example, if you place it in your armpit area and get a reading of 95F pretty consistently, then suddenly get a reading of 99F then you’ve probably got a fever. If you want to get “closer” to what a mouth thermometer might report, then come up with a little calibration routine… so 95F on the xBT shows 98F on the mouth thermometer… then 99F on the xBT would approximate to 101F on the mouth thermometer.

All the tissue folds and range of motion there means it could pinch up in the tissue during normal activities… and there is scar tissue that can form in an uncomfortable configuration because of all those folds and motions… and the hair and bacteria might cause some issue with installation complications… etc. etc. etc.

Someone here put chips (multiple) in their face / head and also I’ve seen a non-DT implant put in the cheekbone area of the face.

There is no standard for these application bits and I don’t think there are any other chips like this that function by putting temp data into the application bits either… probably due to patents.

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:bulb: Interesting :thinking: In all seriousness, from a fertility point of view, in the scrotum may be a viable option.
I wonder if it has been tried before?

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I was more thinking of the lips. If you have lips like that, you’re the most gorgeous belle in town :slight_smile:

Well, if I get an xBT (which, you might have deduced, I’m thinking about) then I’ll want to derive a correction constant or function comparing the closest thing to my core temperature and what the xBT reports for various temperature points - like at rest at home, right after I exercise, or when I next get sick. Then afterward I can do without the thermometer. But my thinking is, the closer the xBT’s reported value to the actual value, the lower the correction and the more accurate the corrected value. Hence my wanting to find the best location for the chip.

Rectal is one route I’m not keen on to take reference temperature measurements, for obvious reasons. But it’s the most accurate, and I only have to do it a few times before eschewing it altogether, once I know what correction to apply.

Interesting. I’d love to hear what those chips were for. When you say a non-DT implant, you mean a chip as well, or some kind of cosmetic subdermal?

I was more wondering about applications other than temperature. Maybe like a read counter, or some extra information like a breed or breeder identifier code for animals… That sort of thing. If all the readers that exploit those bits read them as a temperature value encoded Destron Fearing-style, it means only Destron Fearing ever exploited them, and only for that particular purpose.

You have a dirty mind… I was thinking implanting in a leg, between the legs, near the groin area :slight_smile:

But since you bring it up, the sack would be a really bad idea, as the testicles are notoriously hanging outside in there to be kept cooler than the rest of the body. People with undescended testicles are known to run the risk of becoming sterile because their nuts are too hot in the body. So all the xBT would tell you there is that you’re good to go if you want children.

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Exactly, that was my point :+1:
That is a whole other market for fertility…If I needed it, I would do it.

You would probably want it “anchored” :anchor: along the seam I guess :man_shrugging: so it wasn’t all mobile and pokey

BioBond is a porous material that, when applied to the bioglass encasement of the chip, forms an “anti-migration cap” which promotes tissue growth throughout its porous structure. The goal is to secure the tag and stop it migrating by literally letting the body grow into it to hold the chip in place.

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Meh… who am I kidding.

xBT and Halo reader on order.

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We put our xBT in our chest, kinda above the left boob? It’s not like, ideal core temp or whatever but its pretty consistent in terms of readings. We haven’t tried to like calibrate it or whatever, but like Amal said, if we see a reading thats suddenly higher than usual, we’ll know somethings up. FWIW we usually see 33C to 34C on it in that location.

The xBT is in. It’s implanted about an inch below my armpit, chest-side, and it’s entirely covered by my arm when it’s down. I’ve taken a few “gold standard” measurements and compared them to the chip’s throughout the day: provided I keep my arm down for a few minutes before a reading, the chip’s reported temperature seems to stay between 0.5C and 1C below the thermometer’s.

So, pretty much identical to a regular axillary temperature reading - which it is, at the end of the day - only much, much more convenient to take: the Halo Scanner easily reads the chip through 3 layers of clothing without lifting my arm up (so, through a coat, sweater, T-shirt and at least a solid inch of flesh when my arm is down). Amazing performance!

Here’s a piece of advice if you want to implant an xBT, to get the same performance: have it implanted it horizontally - i.e. parallel to the floor when standing up, or “back-to-front” - and not vertically. Roughly like the blue mark on @amal’s drawing.

The reason is, when the xBT was still in the needle, I noticed the Halo Scanner’s performances were best when I would present the needle orthogonal to the reader, as if “flying through the loop” so-to-speak, and not flat against the reader. So I figured I’d implant the chip on the side of my chest horizontally so that one end would face the reader when approaching it flat against the front of my chest, and it seems to work great. Also, it’s a lot easier for the piercer to work facing you.

Here’s another thing I noticed: if the chip is below 23.9C, it stops reporting the temperature. That got me scared for a minute at the piercer’s: I had just arrived, I took a few readings of the chip to ensure it was still working before implanting it, and the Halo only reported the UID but no temperature. But the chip had spent 2 hours in the car at -20C, so I figured it was probably okay, just too cold to report anything useful. Sure enough, seconds after implanting it, the temperature started showing up and climbing.

So, just so you know, if you get a UID reading from your chip but no temperature, you’re either dead, or you’ve turned into a zombie. Another useful feature :slight_smile:




Wasn’t quite what I had in mind, or for the same purpose, so I wouldn’t want to take the credit for the idea. :wink:

How long ago did you implant?
Who did the implant?
Is it healing/ healed well?

You MIGHT be the only person on the planet :earth_africa: with an HF RFID pearl!

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No kidding… With LF you could possibly stick your crotch against a reader. That’s a weird enough way of accessing a building. But with NFC, the read range is so short you might need to get it out. I reckon most workplaces would consider this an inappropriate way of entering the premises.

Threads are there to be hijacked. How else would I have read about an RFID-enabled, temperature-sensing wang eh? :slight_smile:

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After taking more “gold standard” measurements, I’ve concluded that I should add .5C if I wear a heavy sweater and I’ve kept my arm down for a long time, and .8C if I wear less heavy clothing and/or I’ve been moving my arm around more.

Anyhow, I’m getting pretty sick of that by now. So that’s precise enough for me for the time being. I may try it again next time I get sick, to see if the temperatures correlate also when I run a fever.


All healed up. Not that there was much to heal in the first place, mind you… It’s a bit blue though: maybe the armpit area is more prone to haemorraging than other sites. The skin sure feels thin there. Also, I told the piercer to go deeper than the implants in my hands - and I sure can’t feel the chip at all. Maybe that has something to do with it.

Incidentally, the xBT might have paid for itself already: I’ve been closing watching my temperature throughout the day with it since the injection, and I’m clearly in hypothermia all the time. So much so that I’ve kept on taking my temperature the regular way to compare, because I didn’t believe the chip. More importantly, the chip tells me my body is warmer in the morning than in the evening, which isn’t normal.

That, and other discreet symptoms I have, tell me my thyroid might be acting up again. Time to see the doctor. If the xBT allowed me to catch it early, that alone will have made it totally worth the purchase!


How is the pain implanting it at this location?
Did you use anything to dull the pain?

Shower thought: would swallowing the implant give a better core temperature reading? Assuming it can still work correctly in the stomac? Would it support the acidic environment?
And I won’t mention the retrieval on “the other side”. :slight_smile:

The pain level is identical to the hand really. I didn’t use anything: it’s over after 20 seconds anyway.

I thought about swallowing a test implant and trying to “follow” it down my belly with the halo reader, to see if it still reads deep inside me and gives stable absolute temperature readings.

But then if it does, what do I do with that? It’s not like my piercer is going to implant the final chip in one of my organs or something - assuming there’s a suitable organ to implant it in: I’m no doctor but it seems unsound. And naturally, forget about getting a doc to do it.

Regarding the gastric acid, the implant is glass. Maybe the acid would dissolve the parilene coating, but the rest should survive intact for quite some time, even if it stayed in the stomach and didn’t go down the poop chute.

But even if sticking it in the stomach permanently was doable, it’s out for me: I’ve had experimental stomach surgery almost 2 years ago, and my stomach doesn’t resemble anything normal anymore. It’s probably best left alone…

As for recovering the test chip, well… I don’t think so :slight_smile:

Damn, you missed the opportunity to ask the surgeon to leave a xBT implant somewhere in the vicinity of the stomach! :wink:

It becomes expensive for a “one-time use”.

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Believe me, when the research team rebuilt my stomach, I was just happy to have the opportunity to participate in the study and have a chance to be done with my GERD problem once and for all. So I was just following orders, like a good guinea pig :slight_smile:

I don’t want to implant something that’s gone through my digestive system, however thorough the cleaning. That’s just too dodgy. And the Biobond coating will probably be damaged too. Not worth the money.