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0091 : Thyroxine, Free (FT4)

INFORMATION:

Alternate Name:

Free T4, FT4

Methodology:

Electrochemiluminescence Immunoassay

Clinical Utility:

Thyroxine (T4) and Triiodothyronine (T3) and thyroid stimulating hormone (TSH) are used to assess thyroid function. Most T4 and T3 circulate bound to protein but a small portion (free T4) circulates unbound and is the active form of thyroxine. Since free T4 is not affected by levels of protein it is not subject to fluctuations due to varying levels of protein.

ORDERING:

Test Code:

0091-9

Turnaround Time:

1 DAY

Preferred Specimen:

1 mL SST Tube

Collection:

Container	Qty	Temp	Stability
SST Tube	1	Refrigerate	7 DAYS

Collection Instructions:

SST: Fill tube, invert gently 5 times, label with patient name, let stand for minimum of 30 minutes, maximum of 1 hr, spin for 10-15 minutes

Alternative Specimen:

Red Top, Microtainer - Pediatric SST, Aliquot Tube-Serum, Microtainer - Pediatric Red, Aliquot Serum- Red Top

Billing:

CPT Codes:

84439 x 1

CPT Code Disclaimer

CPT codes provided are for informational purposes only. Accuracy of CPT presented should be validated prior to consideration for billing.

CPT coding is the sole responsibility of the billing party. Please direct any questions regarding CPT coding to the payer being billed.

Code

SST

SST Tube

Name

SST Tube

Code

BML

Bone Marrow - Lavender Top

Name

Bone Marrow - Lavender Top

Code

LAV

Lavender top- EDTA

Name

Lavender top- EDTA

Code

FLUL

Fluid Lavender (source required)

Name

Fluid Lavender (source required)

Code

TAN

Tan Top

Name

Tan Top

Code

YEL

Yellow top- ACD

Name

Yellow top- ACD

Code

YELS

Yellow top- SPS

Name

Yellow top- SPS

Code

RBP

Blue-Royal Blue Top K2 EDTA Plasma(*LAVENDER LINE)

Name

Blue-Royal Blue Top K2 EDTA Plasma(*LAVENDER LINE)

Code

RBS

Blue-Royal Blue Trace Element Serum (**RED LINE**)

Name

Blue-Royal Blue Trace Element Serum (**RED LINE**)

Code

URB

Blue-Royal Urine

Name

Blue-Royal Urine

Code

GRY

Grey top- Sodium Fluoride

Name

Grey top- Sodium Fluoride

Code

BMG

Bone Marrow - Green Top

Name

Bone Marrow - Green Top

Code

UG

Green top urine

Name

Green top urine

Code

UGTP

Green top urine (preservative)

Name

Green top urine (preservative)

Code

FLUG

Fluid Green Top

Name

Fluid Green Top

Code

QFT

Green Top-Lithium Heparin

Name

Green Top-Lithium Heparin

Code

FLUR

Fluid Red Top

Name

Fluid Red Top

Code

LTB

Light blue top

Name

Light blue top

Code

PPT

White Top (PPT)

Name

White Top (PPT)

Code

ACDNA

Ariosa Cell-Free DNA (White TopTube)

Name

Ariosa Cell-Free DNA (White TopTube)

Code

TP

ThinPrep Vial

Name

ThinPrep Vial

Code

SPTH

Surepath Vial

Name

Surepath Vial

Code

O&P

O&P Kit (Total Fix)

Name

O&P Kit (Total Fix)

Code

U24

Urine Container - 24hr

Name

Urine Container - 24hr

Code

UA

Urine Urinalysis Tube - Yellow

Name

Urine Urinalysis Tube - Yellow

Code

CUL

Swab-Bacterial Culture

Name

Swab-Bacterial Culture

Code

ES

Swab-E

Name

Swab-E

Code

APT

Swab-Aptima Genprobe

Name

Swab-Aptima Genprobe

Code

UGP

Urine Container-Genprobe-Aptima

Name

Urine Container-Genprobe-Aptima

Code

BDA

Affirm(BD) VPIII

Name

Affirm(BD) VPIII

Code

RED

Red Top Plain

Name

Red Top Plain

Code

UGY

Urine Tube - Grey Top

Name

Urine Tube - Grey Top