Test Code T4 T4 (Thyroxine), Total, Plasma or Serum
Additional Codes
Ordering Mnemonic |
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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.
Day(s) Test Set Up
Monday through Sunday
Test Classification and CPT Coding
84436 (HH Bill Code 0205352)
Reference Values
4.7-13.3 µg/dL