Dr N,
I recently saw an article on
the TV that chronicled one woman's attempt to document the need for
monitoring hormone levels in individual women so that their HRT dosages
could be adjusted specifically for each woman. Do you know where I could
get more info on this subject?
Thanks
Reply:
Hi:
This is an important
issue, but the answer is different than some might expect.
Every woman's metabolism
and absorptive ability is unique, and it is prudent to see if the hormones
that are being taken are actually in the bloodstream and are at therapeutic
levels.
For instance, some
women are unable to absorb and/or metabolize oral HRT products well.
Testing them will reveal low or absent levels. On the other hand, some
women on oral HRT products in whom the tested levels appear to be adequate,
continue to experience symptoms of hormone deprivation.
The likely explanation
is that oral HRT products, irrespective of their individual chemical
structure, or whether of natural or synthetic origin, are metabolized
and altered by the liver following their gastrointestinal absorption,
Most women are able to accomplish this in a manner that retains enough
of the bioactivity of the ingested HRT product so that it still performs
it's intended function...
The problem in interpretation
arises, when the metabolized substance is close enough to the bioactive
compound to fool the testing procedure, but not precise enough to perform
it's bioactive role. So, if this is not understood, confusion arises,
as to why the patient is having symptoms in the face of seemingly adequate
hormone levels.
The advantage of
the non-oral route is that since it bypasses this "bolus"
liver effect, if the administered HRT substance is bioactive in it's
initial form, it remains so. And, any measurement results in a more
accurate assessment of it's potential activity.
All this being said,
you don't treat blood tests, you treat individuals. Everyone, has their
own specific response to treatment. Hormone replacement that results
in blood levels in the low end of the accepted therapeutic range may
relieve symptoms and provide it's preventative health function in some
menopausal women. But, the same levels may be completely inadequate
in women who require a higher blood level for optimum effect.
Some menopausal
women and physicians get caught up in using blood tests in an attempt
to "mimic nature." One of the advantages of menopause is that
you can avoid mimicking nature. By bypassing some of the monthly hormonal
fluctuations that are necessary to trigger ovulation and insure reproductive
ability, the menopausal woman can avoid the negative symptoms such as
PMS that are associated with those wide fluctuations.
Another concept
that one sometimes hears about, is the need for pretreatment assessment
of hormone levels. There are a number of pitfalls that should be avoided.
Women who appear
to be menopausal by cessation of their menses, and women who are nearing
menopause but still menstruating, may have "normal" blood
levels, but still be experiencing severe menopausal symptoms. If one
uses their blood levels as the sole indication to treat or not to treat
them, it is inappropriate. The reason for their symptoms in the face
of "normal" blood levels is that their systems are struggling
to maintain their hormone levels, an effort that nature has deemed to
fail,. If their hormones are replaced, their systems are relieved of
this responsibility and the symptoms usually abate.
If a woman has had
her ovaries removed, there is no reason to measure hormone levels as
there is no longer a source for their production. Regardless, if it
is her wish, the testing should be done.
So, the measurement
of blood levels is a useful tool in insuring that HRT substances are
actually getting in the bloodstream. However, it should never be used
as the sole determinant of dosage. One should never loose sight that
a level that is appropriate and optimal for one woman, is not appropriate
for all women.
Dr N