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Topic: percentage of water in the human body (Read 1 time) previous topic - next topic

omarAlwaadh

Hi every one,

Is there any sensor to Measuring the percentage of water in the human body?
And what is it? what is the name of the sensor?
 

raschemmel

#1
Oct 24, 2016, 09:49 am Last Edit: Oct 24, 2016, 10:18 am by raschemmel
Is this your homework assignment ?

I'm going to take a leap here but isn't the answer to your question a blood test ?

Are there any doctors out there who can answer that question ? (Dr. Arduino ?)

If you just take the time to GOOGLE "BODY WATER" this is what you find.

Quote
Total body water can be determined using Flowing afterglow mass spectrometry measurement of deuterium abundance in breath samples from individuals.
So really all you need is a mass spectrometer.
(and breath mints ?)
Check Sparkfun or Adafruit...
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Grumpy_Mike

Is there any sensor to Measuring the percentage of water in the human body?
No.

CrossRoads

Pretty sure I remember 95% from a old Star Trek episode where victims got turned into little blocks.
About $5 worth of chemicals.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

Jiggy-Ninja

The procedure is as follows:

1) Weigh the thing
2) Dry the thing out in a warm oven
3) Weigh the thing again. The difference is the water weight of the original thing.

Needless to say, this is a very destructive procedure.
Hackaday: https://hackaday.io/MarkRD
Advanced C++ Techniques: https://forum.arduino.cc/index.php?topic=493075.0

larryd

#5
Oct 24, 2016, 09:38 pm Last Edit: Oct 24, 2016, 09:39 pm by LarryD
Agreed.
Weigh the person.
Put them into a test tube.
Heat contents to remove all the water.
Weight, compare remaining ashes to the original weight value.


.
No technical PMs.
The last thing you did is where you should start looking.

INTP

Hydrostatic testing gives the best estimate of composition, and even then it stands on quite a few guesstimations for the final numbers.

raschemmel

#7
Oct 24, 2016, 10:22 pm Last Edit: Oct 25, 2016, 03:44 am by raschemmel
You  need a cadaver to weigh before and after

Seriously,  google says gas spectrometry of breath sample. (Google : "body water")
Arduino UNOs, Pro-Minis, ATMega328, ATtiny85, LCDs, MCP4162, keypads,<br />DS18B20s,74c922,nRF24L01, RS232, SD card, RC fixed wing, quadcopter

Due_unto

I wonder how those Fitness scales, the ones with the conductive pads you stand on with bare feet, do it.  Whenever I get on it it always tells me my water percentage is somewhere around 50%.  Funny, I don't feel or look like a prune (to most people, anyway!)
Do not look into laser with remaining good eye.

INTP

Those scales use crude formulas with plugging in galvanic skin response

Grumpy_Mike

Quote
I wonder how those Fitness scales, the ones with the conductive pads you stand on with bare feet, do it.
Basically they don't.

MarkT

Hi every one,

Is there any sensor to Measuring the percentage of water in the human body?
And what is it? what is the name of the sensor?
 
Yes, an MRI scanner can probably answer that, as you can scan for all hydrogen atoms in particular
chemical environments, such as water-water hydrogen bonds.  Of course the definition
of water in a living cell is fraught with issues such as do you count water molecules in
permanent association with protein molecules, etc.

There is no cheap sensor to answer the question.
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

Jiggy-Ninja

Basically they don't.
Just like those treadmills that tell you how many calories you burned.
Hackaday: https://hackaday.io/MarkRD
Advanced C++ Techniques: https://forum.arduino.cc/index.php?topic=493075.0

ChrisTenone

Your liver is gonna be a lot wetter than your hip bone, so when you say % water, are you speaking of the average? How precise do you need to know? It sounds nefarious (unless it is a school assignment, then ok.)

Jiggy-Ninja has the basic procedure, but I would suggest homogenizing the sample first, and taking a smaller aliquot to dehydrate. I would run a complete temp vs weight curve, to account for dissolved gasses, volitile organics, and the like.

Ok, gross, right? How about selecting a part of the body that you normally discard, like your hair after a haircut. An experiment always gives you an answer. Your skill as a scientist will determine the meaning of that answer.

Anybody can just google the answer, but wouldn't you like to present something different?

ps, and since you posted here, you'll need to work an Arduino in somehow.
What, I need to say something else too?

MarkT

I like this answer: "if the subject is alive the percentage of water is correct" - so a heart-rate monitor
sensor would do the job!
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

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