Blood explanation - Endocrinology

Endocrinology

Thyroid hormones

Further information: Thyroid function tests

Test	Patient type	Lower limit	Upper limit	Unit
Thyroid stimulating hormone (TSH or thyrotropin)	Adults - standard range	0.3,[3] 0.4,[7] 0.5,[15] 0.6[68]	4.0,[3] 4.5,[7] 6.0[15]	mIU/L or μIU/mL
	Adults - optimal range	0.3,[69] 0.5[70]	2.0,[70] 3.0[69]	mIU/L or μIU/mL
	Infants	1.3[71]	19[71]	mIU/L or μIU/mL
Free thyroxine (FT4) -more detailed ranges in Thyroid function tests article	Normal adult	0.7,[72] 0.8[7]	1.4,[72] 1.5[7], 1.8[73]	ng/dL
		9,[74][3] 10,[75] 12[76]	18,[3][74] 23[76]	pmol/L
	Child/Adolescent 31 d - 18 y	0.8[72]	2.0[72]	ng/dL
		10[74]	26[74]	pmol/L
	Pregnant	0.5[72]	1.0[72]	ng/dL
		6.5[74]	13[74]	pmol/L
Total thyroxine		4,[75] 5.5[7]	11,[75] 12.3[7]	μg/dL
		60[75][76]	140,[75] 160[76]	nmol/L
Free triiodothyronine (FT3)	Normal adult	0.2[75]	0.5[75]	ng/dL
		3.1[77]	7.7[77]	pmol/L
	Children 2-16 y	0.1[78]	0.6[78]	ng/dL
		1.5[77]	9.2[77]	pmol/L
Total triiodothyronine		60,[7] 75[75]	175,[75] 181[7]	ng/dL
		0.9,[3] 1.1[75]	2.5,[3] 2.7[75]	nmol/L
Thyroxine-binding globulin (TBG)		12[7]	30[7]	mg/L
Thyroglobulin (Tg)		1.5[75]	30[75]	pmol/L
		1[75]	20[75]	μg/L