Thyroxine, Free by Direct Equilibrium Dialysis/HPLC-Tandem Mass Spectrometry FT4DIA

Method(s) Quantitative Equilibrium Dialysis/High Performance Liquid Chromatography-Tandem Mass Spectrometry
Specimen Required
Collect

One 5 mL plain red or gold (SST) top tube.

Transport

2 mL serum refrigerated. (Min: 0.3 mL)

Remarks

Separate from cells or gel ASAP or within 2 hours of collection.

Stability

After separation from cells: Ambient: 4 days; Refrigerated: 2 weeks; Frozen: 1 month

Unacceptable Conditions

Plasma

Schedule Sun, Tue, Thurs
Billing Code 5010911
CPTCode 84439
Preferred Specimen Collection Device(s)
Reference Interval
Free Thyroxine
AgeFemaleMale
25-30 weeks gestation 0.5-3.3 ng/dL
0.5-3.3 ng/dL
31-36 weeks gestation 1.3-4.7 ng/dL1.3-4.7 ng/dL
Birth to 1 week 2.2-5.3 ng/dL 2.2-5.3 ng/dL
2-3 weeks 0.9-4.0 ng/dL 0.9-4.0 ng/dL
1-5 months 1.1-2.2 ng/dL 1.1-2.2 ng/dL
6 months-6 years 1.4-2.7 ng/dL 1.4-2.7 ng/dL
7 years-17 years 1.1-2.0 ng/dL 1.1-2.0 ng/dL
18 years and older 1.1-2.4 ng/dL 1.1-2.4 ng/dL
Pregnancy, 1st Trimester 0.7-2.0 ng/dL 
Pregnancy, 2nd Trimester 0.7-2.1 ng/dL  
Pregnancy, 3rd Trimester0.5-1.6 ng/dL 
No Appointment Necessary
Show All Locations >
12 Patient Service Centers in Central New York.

Test Directory

A B C D E F
G H I J K L
M N O P Q R
S T U V W X
Y Z # List >