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Test Code T4 T4 (Thyroxine), Total, Plasma or Serum

Additional Codes

Ordering Mnemonic
T4

Methodology

Chemiluminescence

Performing Laboratory

Holland Hospital Laboratory Services

Specimen Requirements

Specimen must arrive within 48 hours of draw.

 

Submit only 1 of the following specimens:

 

Plasma

Container/Tube: Mint-top (lithium heparin) tube

Specimen Volume: 1 mL of plasma

Collection Instructions:

Note: 1. Indicate plasma.

2. Label specimen appropriately (plasma).

 

Serum

Container/Tube: Serum gel tube

Specimen Volume: 1 mL of serum

Collection Instructions:

Note: 1. Indicate serum.

2. Label specimen appropriately (serum).

Specimen Transport Temperature

Refrigerate; Freeze if >24 hrs.

Reference Values

4.7-13.3 µg/dL

Day(s) Test Set Up

Monday through Sunday