LP14487-0     Thyrotropin

DESCRIPTION
  Part: Thyrotropin
  Description: A glycoprotein hormone secreted by the adenohypophysis (anterior pituitary gland). Thyrotropin stimulates the thyroid gland by increasing the iodide transport, synthesis and release of thyroid hormones (thyroxine and triiodothyronine). Thyrotropin consists of two noncovalently linked subunits, alpha and beta. Within a species, the alpha subunit is common in the pituitary glycoprotein hormones (TSH; Luteinizing hormone and FSH), but the beta subunit is unique and confers its biological specificity.
 
 

MAPPING GUIDANCE
  Part: Thyrotropin
  Description: Thyrotropin (TSH) has three codes in LOINC which differ by their detection limits.

1) The so-called first-generation TSH test was of low sensitivity, such that it was not useful for diagnosing or following hyperthyroidism. It is no longer commercially available.

LOINC has a code with no specified detection limit.

3016-3 Thyrotropin [Units/volume] in Serum or Plasma

This code has existed since the first release of LOINC (in 1994). Today you should avoid mapping to it except when you are mapping old TSH tests whose sensitivity cannot be ascertained.

2) The so-called 2nd generation TSH has a detection limit of <= .05 mIU/L and is now the routine TSH test in most settings.

11579-0 Thyrotropin [Units/volume] in Serum or Plasma by Detection limit <= 0.05 mIU/L

It has the advantage over earlier tests in that it can detect both hyperthyroidism (reflected by an abnormally low TSH) and hypothyroidism, reflected by an abnormally high TSH.

3) A third-generation TSH with a detection limit of <= .005 mIU/L also exists.

Labs usually add high sensitivity or ultra-sensitive or 3rd generation to its name. It only offers advantage over the 2nd generation test in special cases. Because of its limited measurement range at the high end, it can require more work (extra dilution steps) to quantify the value of very high TSH levels, but it is widely available.

11580-8 Thyrotropin [Units/volume] in Serum or Plasma by high sensitivity Detection limit <= 0.005 mIU/L

LOINC includes codes for TSH tests that are reported in mass concentrations and molar concentrations. However, all current TSH test results are reported as mIU/L (or equivalent). Except in very special circumstances, the only TSH variables to which you should map are the two immediately above.
 
 

BASIC PART PROPERTIES
  Construct for LOINC short name: TSH
  Type: COMPONENT
  Status: ACTIVE
  Created On: 5/4/2000

LANGUAGE VARIANTS
 
  Chinese (CHINA)  (From: Lin Zhang, A LOINC volunteer from China)   SYNONYMS
  促甲状腺激素     TSH;促甲状腺素;甲状腺刺激激素;甲状腺刺激激素(Thyroid Stimulating Hormone,TSH)
 
  Dutch (NETHERLANDS)  (From: NVKC, Dutch Society for Clinical Chemistry and Laboratory Medicine, The Netherlands)    
  TSH      
 
  Estonian (ESTONIA)  (From: Estonian E-Health Foundation)   SYNONYMS
  Kilpnääret stimuleeriv hormoon     Türotropiin
 
  French (BELGIUM)  (From: Jean M. Prevost, MD, Biopathology)   SYNONYMS
  Hormone thyréostimulante     TSH
 
  French (CANADA)  (From: Canada Health Infoway Inc.)    
  Hormone thyréostimulante      
 
  Greek (GREECE)  (From: Efstratia Kontaxi, MD, MSc, and Evripidis Stefanidis, MD, with technical support from Panagiotis Kontaxis, Diploma of Electrical and Computer Engineering.)   SYNONYMS
  Θυρεοειδοτρόπος ορμόνη     TSH
 
  Italian (ITALY)  (From: Consiglio Nazionale delle Ricerche)   SYNONYMS
  Tireotropina     TSH
 
  Russian (RUSSIAN FEDERATION)  (From: Yaroslavl State Medical Academy)    
  Тиреотропин      
 
  Spanish (SPAIN)  (From: the Clinical Laboratory Committee of SERVICIO EXTREMEÑO DE SALUD, with the support of BITAC MAP.)    
  Tirotropina      
 
  Turkish (TURKEY)  (From: LOINC Turkish Translation Group and the Turkish Ministry of Health)    
  Tirotropin      

INTERNAL FIELDS
  Detail Page Created On: 6/20/2019 9:28:12 AM
  Display name: Thyrotropin
  Preferred Abbreviation: TSH