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Estradiol Free, Equilibrium Dialysis, With Total Estradiol, HPLC/MS-MS (Endocrine Sciences)

CPT: 82670; 82681
82670; 84999
82670; 82681
Updated on 12/31/2020
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Expected Turnaround Time

9 - 12 days

Specimen Requirements


Serum, frozen


3 mL

Minimum Volume

1 mL (Note: This volume does not allow for repeat testing.)


Gel-barrier tube or red-top tube


Serum must be separated from cells within 45 minutes of venipuncture. Send serum in a plastic transport tube. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.

Storage Instructions


Stability Requirements



Room temperature

1 day


6 days


32 months

Causes for Rejection

Plasma sample

Test Details


Liquid chromatography tandem mass spectrometry (LC/MS/MS); equilibrium dialysis


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
500649 Estradiol, Free Serum 502608 Estradiol, Serum, MS pg/mL 35384-7
500649 Estradiol, Free Serum 500431 Free Estradiol, Percent % 14960-9
500649 Estradiol, Free Serum 500432 Free Estradiol, Serum pg/mL 2240-0

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