T4 (Thyroxine), Free (Beckman)

Interpretation

Method

Chemiluminescence

Reference Range

Units: ng/dL

Female		Male		Unknown
Age	Range	Age	Range	Age	Range
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

Receiving Instructions

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.

Misc Sendout

Performance

Lab Department

Chemistry, Automated Panels(CHA)

Frequency

Daily

Available STAT?

No

Performing Location(s)

HMC	Chemistry, Automated 206-520-4600 325 9th Ave, Rm # GWH-47, Seattle, WA 98104-2420
UW-NW	Main Lab 206-668-1344 UW Medical Center – Northwest 1550 N 115th Street, A200 Seattle, WA 98133
UW-MT	Chemistry, Automated 206-520-4600 Clinical Lab, Room NW220, University of Washington Medical Center, 1959 NE Pacific street, Seattle, WA 98195

Billing & Coding

CPT Codes

84439

LOINC

3024-7

Interfaced Order Code

UOW1038

Interfaced Result Code

UOW1038