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Diagnosis and evaluation of hypogonadism.
[kallmann syndrome]
Hypogonadism
is
defined
as
defects
in
gonadal
response
to
gonadotropins
or
sex
hormone
biosynthesis
.
Clinical
evaluation
and
diagnosis
of
patients
is
challenging
,
particularly
before
puberty
.
Basal
determinations
of
the
gonadotropins
luteinizing
hormone
,
follicle-stimulating
hormone
,
the
gonadal
sex
steroids
testosterone
and
/
or
estrogen
and
markers
of
gonadal
function
including
inhibin
B
and
anti-
Müllerian
hormone
are
useful
,
but
only
at
specific
ages
,
thus
necessitating
combined
hormonal
tests
with
meticulous
physical
examination
.
GnRH
testing
can
be
useful
,
and
may
be
used
in
combination
with
hCG
testing
to
discriminate
between
isolated
hypogonadotropic
hypogonadism
and
constitutional
delay
of
growth
and
puberty
.
Urine
steroid
profiles
may
be
helpful
in
the
diagnosis
of
androgen
biosynthetic
defects
.
Also
increasingly
important
is
genotypic
screening
for
genetic
or
chromosomal
abnormalities
,
together
with
detailed
family
and
medical
histories
including
antecedent
substance
abuse
,
chronic
disease
,
and
exposure
to
chemotherapy
or
radiotherapy
.
This
chapter
explores
the
diagnosis
and
evaluation
of
patients
with
hypogonadism
and
reviews
the
genetic
/
chromosomal
factors
involved
in
the
condition
.
Diseases
Validation
Diseases presenting
"thus necessitating combined hormonal tests with meticulous physical examination"
symptom
kallmann syndrome
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