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 Convert and Calculate Post any conversion related questions and discussions here. If you're having trouble converting something, this is where you should post.* Guest Posting is allowed.

#11
05-22-2008, 04:08 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 8,786 Rep Power: 17
Re: mmol/l to mg/l

Quote:
 Originally Posted by dorianjane Regarding the number '18' in this forum. It appears in much literature surrounding the conversion of mmol/L - especially for blood glucose. I found a diabetes article today that uses the number 18 as a conversion tool, on a UK diabetic website. I was trying to find a simple explanation for mmol/L for a student nurse whom I am mentoring just now. As usual I have become totally side tracked. I would find it interesting to discover where the '18' originates - can investigate 'links' myself, if any available. Thank you.
The proper molar mass for glucose is 180 g/mol. However, the units commonly used are mg/dL and mmol/L. The factor of 18 is the product of 180 used to convert between grams and moles, and 0.1 to convert between liters and dekaliters. It saves a step at the risk of making the conversion process very confusing.

For anything, establish the chemical formula. Use a periodic table (or other reference of atomic weights) to add up the atomic weights of all the atoms that make of the molecule for which a molar mas is desired. A number of grams equal to this atomic weight is the molar mass for converting between grams and moles.

This Wikipedia article is a good starting point for additional info on molar mass: http://en.wikipedia.org/wiki/Molar_mass

Last edited by JohnS; 05-22-2008 at 05:08 AM.
#12
09-02-2008, 06:21 PM
 founi Guest Posts: n/a
Re: mmol/l to mg/l

18 is for the conversion of blood glucose. for the cholesterol you should multiply the mmol by 39 and you will get the mg/dl.
#13
06-21-2009, 08:03 PM
 Unregistered Guest Posts: n/a
Re: mmol/l to mg/l

Geez- please pay close attention to the fact that there are no fixed 'conversion factors' between these sets of units. Understand their *meaning* and your basic (as in 6th grade) chemistry and math.

It is frightening anyone in the health and medical professions should be this clueless. Much less anyone mixing toxic solutions.

Thanks to those replying with correct guidance (check the wikipedia suggestion, as bare minimum starting point).

To the rest carelessly tossing out numbers randomly, completely missing the fact that you have been using the mass of a specific element or molecule rather than a conversion factor: you are dangerous to the health and safety of others. You are unqualified to be working with chemicals, much less advising others.
#14
06-22-2009, 02:50 AM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,315 Rep Power: 11
Re: mmol/l to mg/l

Quote:
 Originally Posted by Unregistered Geez- please pay close attention to the fact that there are no fixed 'conversion factors' between these sets of units. Understand their *meaning* and your basic (as in 6th grade) chemistry and math. It is frightening anyone in the health and medical professions should be this clueless. Much less anyone mixing toxic solutions. Thanks to those replying with correct guidance (check the wikipedia suggestion, as bare minimum starting point). To the rest carelessly tossing out numbers randomly, completely missing the fact that you have been using the mass of a specific element or molecule rather than a conversion factor: you are dangerous to the health and safety of others. You are unqualified to be working with chemicals, much less advising others.
Every student has to start somewhere, and not all tutors are that approachable or helpful. Most people who ask medical questions on here are just either checking their working, or are patients trying to understand what their blood tests mean. Sometimes students just need help understanding what a question is asking in the first place. You are welcome to register and join in and answer questions nicely.
#15
08-03-2009, 11:01 PM
 Max J Guest Posts: n/a
Re: mmol/l to mg/l

ALDOSTERONE:

What is conversion factor mmol/L to ng/dL for ALDOSTERONE. Thanks.
#16
08-04-2009, 02:55 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 8,786 Rep Power: 17
Re: mmol/l to mg/l

Quote:
 Originally Posted by Max J ALDOSTERONE: What is conversion factor mmol/L to ng/dL for ALDOSTERONE. Thanks.
Wikipedia says molar mass is 360.44 g/mol.
http://en.wikipedia.org/wiki/Aldosterone

mmol/L x 1 L/10dL x 360.44 g/mol would give mg/dL
(equivalent to just multiplying by 36.044)

Multiply by 1 million for ng/dL, but that may be an inappropriate unit.
#17
02-17-2010, 06:51 AM
 Unregistered Guest Posts: n/a
Re: mmol/24 hrs to mg/24 hrs

We are running our microalubumins at mg/24 hr. I would like to know how to convert from mmol/24 hr to mg/24 hrs...thanks!
#18
04-12-2010, 09:59 AM
 Unregistered Guest Posts: n/a
Re: mmol/l to mg/l

((g/molar mass)/L) * 1000 = mmol/L

mmol/L or millimolarity is simply molarity [moles/L] * 1000
This is because 1 mole = 1000 millimoles
to figure out how many moles of material you have; divide the mass (g) by the molar mass (g/mole - found on the periodic table)
#19
04-25-2010, 07:52 AM
 Unregistered Guest Posts: n/a
Re: mmol/l to mg/l

what is the convrsion of mmol/l to mol/l
Quote:
 Originally Posted by forconversion20 hello everyone is there any conversion factor to convert mmol/l to mg/l? how does one prepare mmol/l of any solution, say lead nitrate?? cheers p
#20
04-25-2010, 08:39 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 8,786 Rep Power: 17
Re: mmol/l to mg/l

Quote:
 Originally Posted by Unregistered what is the convrsion of mmol/l to mol/l
There are 1000 millimoles in a mole, so divide by 1000.

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