Thyroid stimulating hormone with reflex to free T4

Alphabetical Test listing

Thyroid stimulating hormone with reflex to free T4-8960

  
Thyroid stimulating hormone with reflex to free T4
  
8960
  
LAB8960
  
TSR
  
Thyrotropin
Thyrotropic hormone
  

Any TSH value of <0.35 or >4.94 ┬ÁIU/mL will automatically reflex to a Free T4 at an additional charge

  

This reflex test was established on the recommendation of the Clinical Practice Council to be the preferred first lab test ordered in the screening for thyroid disease.

Any TSH value of <0.35 or >4.94 µIU/mL will automatically reflex to a Free T4.  Providers also have the ability to order each of these tests (TSH and FT4) individually.

 

  
Lithium heparin (Li hep) plasma
  
  
2.0 mL
  
0.2 mL
  

Immediately follow collection, mix sample by inverting 8 - 10 times to prevent clotting

  

Spin

  

Lt green plasma separator (PST)

  
Serum
  

Gold serum separator (SST) tube

Red serum vial/tube, 5 mL

Red serum vial/tube, 10 mL

Red/Grey marble top serum separator (SST) vial/tube, 8.5 mL

  

Gold or Red/Grey marble top:

Immediatley following collection, mix sample by inverting 5 times

  

Gold or Red/Grey marble top:

  1. Allow sample to clot for a minimum of 30 minutes
  2. Spin within two (2) hours of sample collection

Red:

  1. Allow sample to clot
  2. Spin
  3. Transfer serum to a False bottom plasma/serum transport vial/tube (AHL), labelled as serum, within two (2) hours of sample collection
  

Gold serum separator (SST) tube

Red/Grey marble top serum separator (SST) tube

False bottom plasma/serum transport vial/tube (AHL)

  

Refrigerated (preferred) - 7 days

Frozen - 6 months

  
  • Improper labels (unlabeled or mislabeled)
  • Hemolysis (some procedures)
  • Improper anticoagulant or ratio
  • Delay in transport
  • Improper storage temperature affecting results
  • Inappropriate timing of collection
  • Improper container
  • Leaking container resulting in compromised specimen
  • Quantity not sufficient (QNS)
  
AHL - Chemistry: C
  
Daily
  
1 day
  

Electrochemiluminescence immunoassay (ECLIA)

  

1 month:   0.43 - 16.10 µIU/mL
2 years:    0.62 - 8.05 µIU/mL
2 - 6 yrs:   0.54 - 4.53 µIU/mL
7 - 12 yrs: 0.66 - 4.14 µIU/mL
Adult:        0.35 - 4.94 µIU/mL

  
84443
84439 (if appropriate)
  
Yes
  
  
06/10/2013
  
09/11/2018
  
02/17/2020