Deborah, you may hear from others but I will add my comments too.
PLEASE DON'T TEST THE MOTHER'S MILK.  Yes, I was shouting.  A  baby who is 
dehydrated will have an elevated sodium.  A mother's colostrum  has a higher 
sodium level than mature milk.  A mother who's production is  down, as in 
weaning, will have an elevated sodium.  Mom's milk sodium level  is not the problem 
to the baby.
The baby needs to feed more, take in more volume and mom needs to push up  
her milk supply.  All this can be achieved without ever needing to test a  
mother's milk.
Ann Perry, RN IBCLC
Boston, MA

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