Now, Marie, you've brought up an interesting question.  (By the way, folks,
Marie & I live in the same town, but have communicated more since we've both
been on-line, than we have in a couple years, except at ILCA Conf.'s.  At
least this is cheaper . . .)
I'm reading 5 (professional) books at the same time, and so am not reading
any one of them as fast as usual, and haven't got to Dr. Woolridge's chapter
yet.  But, do we know exactly when/how the fat content begins to be accessed?
 I have been asked this a million different times by moms, and when I decided
I'd better make sure of my facts, I found several different 'facts'.  :-) !
 I can't recall which resource, but remember one said the hind milk begins
very quickly = like within a few minutes.  So, how does this relate to
Overactive Let-down Syndrome?

As regards your question and test weighing, obviously, it depends on the
individual situation.  I weigh every baby at the beginning of a consult.  If
I'm dealing with a very plump baby, with tons of output (diapers), etc, then
I rarely do a post feed weigh.
For me, the pre & post feed wts.are crucial if I'm dealing with a baby whose
intake I'm not sure of (FTT, etc), or if I'm trying to evaluate the
effectiveness of the infant's suck, usually in these situations it's
confirming what my clinical skills have already told me.  I'm not worried at
this point about whether they are getting fore or hind milk, just any milk at
all!

(And now I'm wondering if you are making a differentiation between pre/post
feed wts and 'test' wts or are you referring to both?)

Happy Holidays!
Kathe Catone