This test may exhibit interference once sample is collected from naquela person who is consuming naquela supplement with naquela high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzyme R). The is recommended to ask all patients quem may it is in indicated porque o this test about biotin supplementation. Patients must be cautioned to stop biotin intake at the very least 72 hrs prior to a collection of der sample.

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Within uma day

Turnaround equipe is defined as ns usual number of dia from ns date of pickup of der specimen for testing to when a result is exit to the ordering provider. In part cases, additional equipe should it is in allowed para additional confirmatory or added reflex tests. Testing schedules might vary.

For more information, please view the literature below.

Thyroid Testing: Assessing Thyroid disease in her Patients

TSH testing at

Red-top tube, gel-barrier tube, or green-top (lithium heparin) tube. Dá not usar oxalate, EDTA, or citrate plasma.

Red-top tube, gel-barrier tube, or green-top (lithium heparin) tube. São de not usar oxalate, EDTA, or citrate plasma.

If der red-top pipe or plasma is used, move separated serum or plasma to a plastic transport tube.

If a red-top tube is used, transport separated serum to der plastic move tube.

If naquela red-top pipe or plasma is used, transport separated serum or plasma to naquela plastic deliver tube.

Thyroid role test. Investigation of low thyroxine (T4) result; the differential diagnosis of major hypothyroidism from normal, and the differential diagnosis of main hypothyroidism são de pituitary/hypothalamic hypothyroidism. TSH is high in main hypothyroidism. Short TSH occurs in hyperthyroidism. Testimonial of therapy in hypothyroid patient receiving various thyroid hormone preparations: short values ser estar found in says of extreme thyroid replacement. Usual result on a sensitive TSH assay is acceptable evidence of enough thyroid replacement.

Follow-up the patients quem have had actually hyperthyroidism treated com radioiodine or surgery. Follow-up low T4 child results.

This third-generation TSH assay have the right to be considered der test for thyroid disease. A result within the accepted referral interval provides solid evidence ao euthyroidism.

Spurious increase a partir de antibovine TSH antitoxin by double-antibody an approach has been reported.2 TSH may be impacted by glucocorticoids, dopamine, e by major illness,3 and these remain restrictions even para the new, sensitive TSH assays. TSH suppression in hypothyroidism com severe condition has to be reported com TSH increase with recovery.4 normal TSH levels in the presence the hypothyroidism have been reported with head injury.5 Iopanoic acid, ipodate, and an antiarrhythmic drug, amiodarone, cause changes in thyroid test results including increases in T4, free T4, and TSH e decreases of T3.6 TSH is no elevated in second hypothyroidism.

Probably no single test, even the sensitive immunoassays, have the right to be supposed to adequately reflect thyroid condição under all circumstances. Among possible problems ser estar the recovery step of nonthyroidal illness, states of resistance come thyroid hormone, thyrotropin-producing tumors, thyroid status in acute psychiatric illness, beforehand in thyrotoxicosis and in subacute thyroiditis.7


Electrochemiluminescence immunoassay (ECLIA)

Reference Interval

See table.1


Range (μIU/mL)

0 come 6 d


7 d to 3 m


3 m uma d to 12 m


1 come 5 y


6 to 10 y


>10 y


The after-effects of subclinical thyroid condition (serum TSH 0.1−0.45 μIU/mL or 4.5−10.0 μIU/mL) ser estar minimal and current indict recommend versus routine therapy of patients com TSH levels in these ranges, however thyroid role tests must be recurring at 6- to 12-month intervals to monitor TSH levels;8 however, therapy of subclinical hypothyroidism is suggested in patients com TSH levels >10.0 μIU/mL or in patients with TSH level 9 In patient who ~ ~ receiving instead of therapy, ns dose need to be changed so serum TSH values range from 0.3−3.0 μIU/mL. An exemption is thyroid hormone replacement treatment after thyroidectomy para differentiated thyroid cancer, in i m sorry case, a mildly come moderately suppressed TSH level is usually desirable.10 the is reasonable to think about serum TSH measurement porque o pregnant women or females planning to come to be pregnant with naquela family background of thyroid disease, former thyroid dysfunction, symptoms or physics findings suggestive of hypo- or hyperthyroidism, one abnormal thyroid gland top top examination, type uma diabetes mellitus, or naquela personal background of autoimmune disorder.11 suggested upper limit porque o the TSH referral range ao pregnant women and preconception is: o primeiro dia trimester − 10

Unsuspected increase in a level the serum TSH is not unusual in yonsei subjects. Der study through Sawin et al found the 22 of 344 (5.9%) healthy and balanced persons larger than açao 60 had der TSH level >10 μIU/mL; 10 of a 22 had low T4 and FT4 index. Yonsei hypothyroid individuals may have minimal recognizable clinical symptom of thyroid deficiency.11 TSH is ns single many sensitive test para primary hypothyroidism. If there is clear evidence for hypothyroidism and the TSH is no elevated, hypopituitarism must be thought about (secondary hypothyroidism).

TSH levels have actually been elevated or inappropriately detectable para high thyroid hormone levels in some patients with thyrotropin-secreting pituitary adenomas. Delay in diagnosis of these tumors may lead to intuitivo compromise. Ns effects of such neoplasms have the right to be misdiagnosed as those of main hyperthyroidism.

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Until the late 1980s, TSH assays were no sufficiently perceptible to differentiate hyperthyroidism em ~ euthyroid (normal) subjects. The new generation of ultrasensitive TSH immunoassays have provided a far an ext effective diagnostic separation that thyrotoxicosis from euthyroidism.

This assay has naquela sensitivity of 0.004 μIU/mL e meets todos criteria as naquela third-generation TSH assay.

1. Recommendation Intervals for Children e Adults.Elecsys Thyroid Test. Roche Diagnostics; may 2005.8595709
2. Sain A, Sham R, singh A, et al. Erroneous thyroid-stimulating hormone radioimmunoassay results due to interfering antibovine thyroid-stimulating hormone antibodies. Am J Clin Pathol. 1979; 71(5):540-542. 377939
3. Chopra IJ, Hershman JM, Pardridge MD, et al. Thyroid function in nonthyroidal illnesses. Ann Intern Med.. 1983; 98(6):946-957. 6407376
4. Morley JE, Slag MF, Elson MK, et al. Ns interpretation of thyroid function tests in hospitalized patients. JAMA. 1983; 249(17):2377-2379. 6403725
5. Slag MF, morley JE, Elson MK, et al. Complimentary thyroxine level in critically okay patients. Der comparison of currently obtainable assays. JAMA. 1981; 246(23):2702-2706. 6796703
6. Borst GC, Eil G, Burman KD. Euthyroid hyperthyroxinemia. Ann Intern Med. 1983; 98(3):366-378 (review). 6187257
7. Ehrmann DA, Sarne DH. Serum thyrotropin and the evaluate of thyroid status. Ann Intern Med. 1989; 110(3):179-181. 2643378
8. Surks MI, Ortiz E, Daniels GH, et al. Subclinical thyroid disease: scientific review and guidelines porque o diagnosis e management. JAMA. 2004; 291(2):228-238.14722150
9. American Association the Clinical Endocrinologists clinical guidelines para clinical practice ao the evaluation e treatment the hyperthyroidism and hypothyroidism. Endocr Pract. 2002 Nov-Dec; 8(6):457-469.15260011
10. Stagnaro-Green A, Abalovich M, Alexander E, et al. Indict of the americano Thyroid association for a diagnosis and management that thyroid an illness during pregnancy e postpartum. Thyroid. 2011; 21(10):1081-1125.21787128
11. Sawin CT, Chopra D, Azizi F, et al. The aging thyroid. Increased prevalence the elevated serum thyrotropin level in a elderly. JAMA. 1979; 242(3):247-250.448912
Brennan MD, Klee GG, Preissner CM, et al. Heterophilic serum antibodies: naquela cause ao falsely elevated serum thyrotropin levels. Mayo Clin Proc. 1987; 62(10):894-898. 3657306
Clark PM, clark JD, Holder R, et al. Pulsatile secretion of TSH in healthy and balanced subjects. Ann Clin Biochem. 1987; 24(Pt 5):470-476. 3310836
Cooper DS. Thyroid hormone treatment: new insights into an old therapy. JAMA. 1989; 261(18):2694-2695. 2709547
Ericsson UB, Fernlund P, Thorell JI. Testimonial of ns usefulness of naquela sensitive immunoradiometric assay para thyroid-stimulating hormone as a first-line thyroid duty test in one unselected patient population. Scand J Clin lab Invest. 1987; 47(3):215-221. 3589485
Greenspan SL, Klibanski A, Schoenfeld D, et al. Pulsatile secretion of thyrotropin mn Man. J Clin Endocrinol Metab. 1986; 63(3):661-668. 3734036
Hamblin PS, Dyer SA, Mohr VS, et al. Relationship between thyrotropin and thyroxine changes during recovery a partir de severe hypothyroxinemia of an important illness. J Clin Endocrinol Metab. 1986; 62(4):717-722. 3949952
Sawin CT, Geller A, Hershman JM, et al. The aging thyroid: a use of thyroid hormone in larger persons. JAMA. 1989; 261(18):2653-2655. 2709545
Surks MI, Chopra IJ, Mariash CN. American Thyroid combinação guidelines ao use of activities tests in thyroid disorders. JAMA. 1990; 263(11):1529-1532. 2308185
Watts NB. Usar of a sensitive thyrotropin assay para monitoring treatment com levothyroxine. Arch Intern Med. 1989; 149(2):309-312. 2644903
Wehmann RE, Gregerman RI, Burns WH, et al. Suppression the thyrotropin in ns low-thyroxine state of severe nonthyroidal illness. N Engl J Med. 1985; 312(9):546-552.3881675
Order password Order code Name bespeak Loinc an outcome Code result Code surname UofM an outcome LOINC
004259 TSH 11580-8 004264 TSH uIU/mL 11580-8

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