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Test Directory

T3 (Triiodothyronine), Total

Test Summary

Total T 3 measurements are used to diagnose and monitor treatment of hyperthyroidism and are essential for recognizing T 3 toxicosis.

Aliases

  • T3 by RIA
  •  
  • T3 Total
  • T-3 Total
  • Total T3

Specimen Collection

Special Instructions

N/A

Preferred Specimen

1 mL serum

Minimum Volume

1 mL

Instructions

Barrier tubes (serum separator tubes or plasma separator tubes) are preferred. If non-barrier tubes are utilized, the serum/plasma must be removed immediately after centrifuging and placed in a screw-cap transfer tube.

Collection notes: Avoid hemolysis. Invert tubes at least 8 times. Allow to clot in an upright position for 30 minutes. Within 2 hours, centrifuge tubes 10 minutes. Keep tightly stoppered.

Do NOT re-centrifuge tubes. Do NOT freeze the primary collection tube.

Patient Preparation

N/A

Storage

Original tube preferred, may be sent in a screw-top transfer tube.

Transport Temperature

Room Temperature or Refrigerated

Specimen Stability

  • Room Temperature = 8 days
  • Refrigerated = 14 days centrifuged
  • Frozen = 12 months

Limitations

N/A

Other Acceptable Specimens

Plasma from Lithium Heparin (Light Green Top) tube

Unacceptable Specimens

Hemolysis, Lipemia, incorrect specimen type, insufficient sample volume, improper storage conditions, exceeds specimen stability guidelines, contaminated sample.

Order Code

T3

EPIC (Premier) Code

LAB375

Includes

N/A

CPT Code

  • 84480

Billing Code

  • 300000

CPT Statement

Methodology

Immunoassay (IA)

FDA Status

FDA Approved

Physician Attestation of Informed Consent

N/A

Testing Laboratory

CompuNet Clinical Laboratories, LLC
2308 Sandridge Drive
Moraine OH, 45439

Reference Range

See Sample Report

Setup Schedule / Expected Turnaround Time

24/7; Report available: Daily

Specimen Collection

Special Instructions

N/A

Preferred Specimen

1 mL serum

Minimum Volume

1 mL

Instructions

Barrier tubes (serum separator tubes or plasma separator tubes) are preferred. If non-barrier tubes are utilized, the serum/plasma must be removed immediately after centrifuging and placed in a screw-cap transfer tube.

Collection notes: Avoid hemolysis. Invert tubes at least 8 times. Allow to clot in an upright position for 30 minutes. Within 2 hours, centrifuge tubes 10 minutes. Keep tightly stoppered.

Do NOT re-centrifuge tubes. Do NOT freeze the primary collection tube.

Patient Preparation

N/A

Storage

Original tube preferred, may be sent in a screw-top transfer tube.

Transport Temperature

Room Temperature or Refrigerated

Specimen Stability

  • Room Temperature = 8 days
  • Refrigerated = 14 days centrifuged
  • Frozen = 12 months

Limitations

N/A

Other Acceptable Specimens

Plasma from Lithium Heparin (Light Green Top) tube

Unacceptable Specimens

Hemolysis, Lipemia, incorrect specimen type, insufficient sample volume, improper storage conditions, exceeds specimen stability guidelines, contaminated sample.

Billing

CPT Code

  • 84480

Billing Code

  • 300000

CPT Statement

Result Information

Methodology

Immunoassay (IA)

Testing Laboratory

N/A

Reference Range

See Sample Report

Setup Schedule / Expected Turnaround Time

24/7; Report available: Daily