Thyroid Fxn Test Report

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THYROID FUNCTION TESTMONALYN R. DELAS ALAS, RMT


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The major thyroid hormone secreted

by the thyroid gland is thyroine!also called T" beca#se it contains

$o#r iodine atoms% To eert its

e$$ects! T" is con&erted totriiodothyronine 'T() by the remo&al

o$ an iodine atom% This occ#rs mainly

in the li&er and in certain tiss#es

*here T( acts! s#ch as in the brain%


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The amo#nt o$ T" +rod#ced by the thyroid gland is controlled by another

hormone! *hich is made in the +it#itary gland located at the base o$ the brain!

called thyroid stim#lating hormone 'abbre&iated TSH)% The amo#nt o$ TSH thatthe +it#itary sends into the blood stream de+ends on the amo#nt o$ T" that the

+it#itary sees%


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I$ the +it#itary sees &ery little T"! then it +rod#ces more TSH to tell the

thyroid gland to +rod#ce more T"% Once the T" in the blood stream

goes abo&e a certain le&el! the +it#itary,s +rod#ction o$ TSH is sh#t o$$%


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T" and T( circ#late almost entirely bo#nd to s+eci$ic trans+ort +roteins! and there

are some sit#ations *hich these +roteins co#ld change their le&el in the blood!+rod#cing also changes in the T" and T( le&els 'it ha++ens $re-#ently d#ring

+regnancy! *omen *ho ta.e control birth +ills! etc)


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/nother meas#rement done to assess the thyroid stat#s o$ +atients is

the Free T" meas#rement% The Free T" a&oids any change the +roteinsco#ld ha&e! gi&ing #s a more acc#rate &al#e $or the T" le&el%


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The T" test is .no*n as the thyroine test% The TSH test meas#res thele&el o$ thyroid1stim#lating hormone in yo#r blood% These are the t*o

most common thyroid $#nction tests and are #s#ally ordered together%


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They are ro#tinely +er$ormed on ne*born babies to identi$y a lo*1$#nctioning

thyroid gland% I$ le$t #ntreated! this condition 'called 2congenital hy+othyroidism3)can lead to de&elo+mental disabilities% 4hen ad#lts s#$$er $rom hy+othyroidism!

they e+erience *eight gain! $atig#e! de+ression! and brittle hair and $ingernails%


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/ high le&el o$ T" indicates an o&eracti&e thyroid

'hy+erthyroidism)% Sym+toms incl#de aniety! #n+lanned

*eight loss! tremors! and diarrhea%


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T( tests! *hich chec. $or le&els o$ triiodothyronine! are #s#ally ordered

i$ T" tests and TSH tests s#ggest hy+erthyroidism% The T( test may alsobe ordered i$ yo# are sho*ing signs o$ an o&eracti&e thyroid gland%


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/bnormally high le&els most commonly indicate a high amo#nt o$

estrogen in the blood or a condition called 5ra&e,s disease% Thisis an a#toimm#ne disorder associated *ith hy+erthyroidism%


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For eam+le! a low T4 levelco#ld mean a diseased thyroid gland 7 OR ~a non1$#nctioning +it#itarygland *hich is not stim#lating the thyroid to +rod#ce T"% Since the +it#itary gland *o#ld normally

release TSH i$ the T" is lo*! a high TSH le&el *o#ld con$irm that the thyroid gland 'not the +it#itary

gland) is res+onsible $or the hy+othyroidism%


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If the T4 level is low and TSH is not

elevated! the +it#itary gland is more li.ely

to be the ca#se $or the hy+othyroidism% O$

co#rse! this *o#ld drastically e$$ect the

treatment since the +it#itary gland also

reg#lates the body8s other glands 'adrenals!

o&aries! and testicles) as *ell as controlling

gro*th in children and normal .idney$#nction%


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9it#itary gland $ail#re means that the other glands may also be $ailing and other

treatment than j#st thyroid may be necessary% The most common ca#se $or the+it#itary gland $ail#re is a t#mor o$ the +it#itary and this might also re-#ire s#rgery to

remo&e%


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Thyroid Fxn Test Report

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