T4 (Thyroxine), Free (Beckman)

General Information

Lab Name

T4 (Thyroxine), Free (Beckman)

Lab Code

T4FR

Description

This test has been replaced by T4 (Thyroxine), Free [T4FRG]

Synonyms

Free T4, Free Thyroxine, FT4, T4-Free, thyroid function

Interpretation

Method

Chemiluminescence

Reference Range

Units: ng/dL
Female Male Unknown
AgeRange AgeRange AgeRange
0-0.6-1.2 0-0.6-1.2 0-0.6-1.2

Effective date: 09/19/2006

Ref. Range Notes

Patient results determined by assays using different manufacturers, instruments, or methods are not comparable.

Interferences and Limitations

Biotin supplements can cause falsely elevated values. See Limitations of Laboratory Testing for details.

Ordering & Collection

Specimen Type

Peripheral Blood

Collection

HMC and UW-MT Onsite Locations:
Preferred: 4 mL blood in LIME GREEN PST tube
Also Acceptable: 4 mL blood in ORANGE RST, GOLD SST, RED TOP or GREEN TOP tube
Pediatric, Preferred: 1 Full LIME GREEN MICROTAINER
Pediatric, Also Acceptable:1 Full GOLD MICROTAINER
Unacceptable: LAVENDER TOP

Offsite Clinic or Other Locations:
Preferred: 4 mL blood in GOLD SST tube
Also Acceptable: 4 mL blood in ORANGE RST or LIME GREEN PST, RED TOP or GREEN TOP tube
Pediatric, Preferred: 1 Full LIME GREEN MICROTAINER
Pediatric, Also Acceptable:1 Full GOLD MICROTAINER
Unacceptable: LAVENDER TOP

Quantity

requested: 1 mL serum/plasma
minimum: 0.5 mL serum/plasma

Processing

Refrigerate serum/plasma.

Storage stability:

  • Room temperature: up to 8 hours.
  • Refrigerated: up to 48 hours.
  • Frozen at −20 °C: longer than 48 hours.
  • Important: Thaw samples only once.

Performance

LIS Dept Code

Chemistry, Automated Panels (CHA)

Performing Location(s)

FHCC Fred Hutch Alliance Lab
206-606-1088

825 Eastlake Ave, Seattle, WA 98109

Fax: 206-606-2027
Hours of Operation: 6:00 a.m. - 10:00 p.m.

Includes satellite labs:
• SAIM - Sloan Clinic 1, 6th Floor
• FHH3 - Sloan Clinic 2, 3rd Floor
• FHH4 - Sloan Clinic 2, 4th Floor
UW-MT Chemistry, Automated
206-520-4600

Clinical Lab, Room NW220,
University of Washington Medical Center,
1959 NE Pacific street, Seattle, WA 98195
UW-NW Main Lab
206-668-1344

UW Medical Center – Northwest
1550 N 115th Street, A200
Seattle, WA 98133

Frequency

Daily

Available STAT?

No

Billing & Coding

CPT codes

84439

LOINC

3024-7

Interfaced Order Code

UOW1038

Interfaced Result Code

UOW1038