T4, total

Alphabetical Test listing

T4, total-847

Test name:

T4, total

Test number:

847

Excellian order number:

84436.0

Abbreviation:

Alternate names:

T4
Thyroxine
Total thyroxine

Specimen type:

Lithium heparin (Li hep) plasma

Collection container:

Lt green plasma separator (PST)

Volume:

1.0 mL

Minimum volume:

0.4 mL

Collection instructions:

Immediatley following collection, mix sample thoroughly by gently inverting 8 - 10, times to prevent clotting

Processing instructions:

Spin within two (2) hours of sample collection

Transport container:

Lt green plasma separator (PST)

Alternate specimen type:

Serum

Alternate collection container:

Gold serum separator (SST) tube

Alternate collection instructions:

Immediatley following collection, mix sample by gently inverting 5 times

Alternate processing instructions:

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

Alternate transport container:

Gold serum separator (SST) tube

Transport and stability:

Refrigerated (preferred) - 8 days

Ambient - 4 days

Frozen - 1 year

Reason for rejection:

Improper labels (unlabeled or mislabeled)
Hemolysis
Improper anticoagulant or ratio
Delay in transport
Improper storage temperature affecting results
Improper container
Leaking container resulting in compromised specimen
Quantity not sufficient (QNS)

Performing lab:

AHL - Chemistry: C

Days set up:

Daily

TAT:

1 day

Method:

Electrochemiluminescence immunoassay (ECLIA)

Reference ranges:

4.5 - 11.7 µg/dL

CPT codes:

84436

Subject to medical necessity (Y/N):

Yes

LCD/NCD:

Medical necessity

Date created:

11/30/2001

Revised date:

01/01/2023

Review date:

12/02/2021