Thyroxine (T4)
General Information
Lab Name
Thyroxine (T4)
Lab Code
T4
Epic Name
T4 (Thyroxine), Total
Synonyms
T4, thyroid function
Interpretation
Method
Chemiluminescence
Reference Range
Units: mcg/dL
| Female | Male | ||
|---|---|---|---|
| Age | Range | Age | Range |
| 0-29d | 4.8-10.8 | 0-29d | 4.8-10.8 |
| 1m- | 4.8-10.8 | 1m- | 4.8-10.8 |
Effective date: 03/16/2010
Ordering & Collection
Specimen Type
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
Handling Instructions
Note: T4 cannot be added on to a specimen more than 12 hours after it has already gone through the automation line and stored.
Quantity
requested: 1 mL serum/plasma
minimum: 0.5 mL serum/plasma
Processing
Refrigerate serum/plasma.
Stability: Room Temperature: 8 hours; Refrigerator: 12 hours; Freeze at -20°C: >12 hours. Thaw sample only once.
Performance
LIS Dept Code
Chemistry, Automated Panels (CHA)
Performing Location(s)
| HMC |
Chemistry, Automated
206-520-4600 325 9th Ave, Rm # GWH-47, Seattle, WA 98104-2420 |
|
|---|---|---|
| UW-MT |
Chemistry, Automated
206-520-4600 Clinical Lab, Room NW220, |
Frequency
Daily
Available STAT?
No
Billing & Coding
CPT codes
84436
LOINC
Interfaced Order Code
UOW1748
Interfaced Result Code
UOW1748