Any TSH value of <0.35 or >4.94 µIU/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.

Lt green plasma separator (PST)

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

Spin within two (2) hours of sample collection

Lt green plasma separator (PST)

Gold serum separator (SST) tube

Red serum vial/tube, 5 mL

Red serum vial/tube, 10 mL

Immediatley following collection, mix sample by inverting 5 times

Gold:

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

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

Refrigerated (preferred) - 7 days

Frozen - 6 months

Ambient - NO

• 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)

Electrochemiluminescence immunoassay (ECLIA)

0.270 - 4.20 µIU/mL

Medical necessity