Sign in →

Test Code LAB1230047 TSH (Thyroid Stimulating Hormone) with Reflex to FT4

Useful For

If the TSH is abnormal, a Free T4 (Lab127) is reflexed automatically.

 

Thyroid function test.  Important tool in the assessment of the origin, extent and management of thyroid disease.  In cases of primary hypothyroidism, T3 and FT4 levels are low and TSH significantly elevated.  In the case of pituitary dysfunction, normal or marginally elevated TSH levels are often seen despite reduction in FT4 and/or T3 levels.  Primary hyperthyroidism (Graves disease, thyroid adenoma or nodular goiter) is associated with high levels of FT4 and/or T3 with depressed or undetectable levels of TSH.

Performing Laboratory

  • Asante Rogue Regional Medical Center (ARRMC)
  • Asante Three Rivers Medical Center (ATRMC)
  • Ashland Community Hospital (AACH)

 

Performing Department

Chemistry

Specimen Required

 

Outpatient clients MUST draw SST

Specimen Minimum Volume

1.0 mL

Specimen Stability Information

Centrifuge and refrigerate within 2 hours of collection

Serum stable 48 hours if aliquoted and refrigerated at 2° to 8° C and serum or plasma is separated from cells by either aliquoting or use of a gel separator tube.

Separate and freeze if testing is delayed greater than 48 hours.

Reject Due To

  • Gross Hemolysis or Lipemia
  • Quantity not sufficient (QNS)
  • Lack of Two Patient Identifiers:
    • 1-Patient's First & Last name 
    • 2-Patient's Date of Birth

Day(s) Performed

Report Available

  • Routine – same day
  • ASAP – 2 hours after receipt of specimen in lab
  • STAT – 1 hour after receipt of specimen in lab

Method Name

  • TSH: Third Generation Chemiluminescence (ultra-sensitive) 
  • FT4:  Two Step Enzyme Immunoassay

CPT Code Information

  • 84443  -  Thyroid stimulating hormone (TSH)
  • 84439 -    FT4