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#1
03-11-2009, 03:30 PM
 steve198329@hotmail.com Guest Posts: n/a
How to covert ammonia levels to ug/dl

I just got my tests back from a lab and I would like to convert 6.5 mmol/dl of ammonia to micrograms per dl

can to help me out?
#2
03-11-2009, 04:15 PM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,536 Rep Power: 19
Re: How to covert ammonia levels to ug/dl

Quote:
 Originally Posted by steve198329@hotmail.com I just got my tests back from a lab and I would like to convert 6.5 mmol/dl of ammonia to micrograms per dl can to help me out?
Please check the units again. I believe there may be some confusion between millimoles and micromoles and/or between liters and deciliters.

The basic conversion between grams and moles requires knowing the molecular weight, which is also the molar mass. For ammonia, NH3, it is 17.03 g/mol. The rest is a matter of prefix manipulation.

If 6.5 mmol/dL were correct (I Believe it is NOT!!), it would convert as follows
6.5 mmol/dL x 17.03 g/mol = 110.7 mg/dL = 110700 µg/dL

This is seriously outside the normal range. In addition, based on the JAMA medical conversions page link posted in resources, the normal "International" way of expressing ammonia is µmol/L (micromoles per liter).

IF we assume those are the units, the conversion would proceed as
6.5 µmol/L x 17.03 g/mol x 1L/10 dL = 11.07 µg/dL

Both numbers should be considered unreliable until you have sorted out the units.
#3
03-11-2009, 04:27 PM
 steve198329@hotmail.com Guest Posts: n/a
Re: How to covert ammonia levels to ug/dl

OH, wait never mind. Those are amino acid analyte markers for ammonia which is 6.5. Sorry, but thanks so much for your help anyway

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