T3 (Triiodothyronine), Total, Plasma or Serum - St. Mary's Regional Medical Center

Additional Codes

LAB136

Useful for diagnosis of T3 toxicosis.

When a thyroid cascade is ordered, if the TSH result is low and the free T4 is normal, a total T3 will be reflexed.

St. Mary's Regional Medical Center-Chemistry

CPT: 84480

Submit only 1 of the following specimens:

Plasma

Container/Tube: Light green-top (lithium heparin) tube

Specimen: 1 mL of lithium heparin plasma

Transport Temperature: Ambient

Collection Instructions:

Note:

1. Indicate plasma.

2. Label specimen appropriately (plasma).

Serum

Container/Tube: Plain, red-top tube or serum gel tube

Specimen: 1 mL of serum

Transport Temperature: Ambient

Collection Instructions:

Note: 1. Indicate serum.

2. Label specimen appropriately (serum).

01-23 months: 1.17-2.39 n/mL

02-12 years: 1.05-2.07 ng/dL

13-20 years: 0.86-1.92 ng/dL

Adult Euthyroid: 0.60 - 1.81 ng/mL

Adult Hypothyroid: less than 0.60 ng/mL

Adult Hyperthyroid: greater than 1.81 ng/mL

Monday through Sunday