NIH Clinical Center
Dept. of Lab Medicine | Dept. of Transfusion Medicine | Anatomic Pathology Test Guide > Lab Test
 Lab Test
 Test Description
Panel Name:
Test Name:
Thyroid Screen
Panel Tests:TSH, Free T4
LIS Test Code:THYR5
Synonyms: Thyroid Panel
Department:Laboratory Medicine
Lab Area:Chemistry
 Specimen Collection


Container:Lithium Heparin

Micro. Container:

Collection Instructions:

Immediately after collecting blood in a tube, gently invert the tube 8-10 times.
This will allow the additive that is present in the tube and the blood to mix completely.

Free Thyroxin (Free T4)  will be reflex ordered and reported when TSH is <0.27 mcIU/mL or >4.20 mcIU/mL.

Delivery Instructions:Send specimen to 2C324 or Tube Station 321
Specimen Type: Blood
Frequency / Restrictions:
 Expected Values/Results

Ranges and Interpretation:

Thyroid Screen
Performed at National Institutes of Health, Bethesda MD
Effective 08Feb14 – present:
:        0.27 - 4.20 mcIU/mL   (SI: mU/L = 1 x mcIU/mL)
Free T4:    0.9 - 1.7 ng/dL        (SI: pmol/L = 12.9 x ng/dL)

Pediatric Range

  1Y- 5Y:            0.84 - 6.22
  6Y- 10Y
         Male :      1.18 - 5.33
         Female : 0.48 - 4.81       
  11Y-15Y:         0.76 - 4.20
         Male :       0.64 - 5.37
         Female:   0.38 - 2.82

Organisms Reported:

Alert Limits:

 Additional Test Information


The Free Thyroxin (Free T4) is only performed as part of the Thyroid Screen when TSH is < 0.27 mcIU/mL or > 4.20 mcIU/mL.


Run on Roche Cobas 6000 Analyzer


Archived Ranges:Historical Reference Ranges


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