ESTRADIOL, FREE

Specimen Required
Draw blood in a red-top tube. Centrifuge, remove serum from cells, and send 2.5 mL serum (1.5 mL minimum) refrigerated in a screw-capped plastic vial.

Rejection Criteria
Gross hemolysis, lipemia, SST

Methodology
Liquid Chromatography, Tandem Mass Spectrometry Equilibrium Dialysis

Stability
Room temperature: 48 hours; Refrigerated: 7 days; Frozen: 2 years

Reference Range
By report

Performed
Monday, Wednesday

Turnaround Time5-11 days
Test CodeESFR
CPT-4 Code (s)
82670 x 2
LOINC Codes
Estradiol, Free   2240-0  
Estradiol   2243-4  

Warde
Medical
Laboratory