Estradiol, Free; Estradiol
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Estradiol – Free, Serum
Test ID: ESTDFREE S
Orderable by Ontario ND
Test
Method
LC-MS and Equilibrium Dialysis
Report Includes
Specimens
Avoid gel-separator tubes; Serum
Clinical Utility
Much of Estradiol is bound to proteins. The unbound portion and Estradiol bound to proteins with low affinity reflect the free concentration. The Free Estradiol may better correlate with medical conditions than the Total Estradiol concentrations.
Test Location
Quest Diagnostics, California USA
Test Version
13-Jan-2023
Specimen
Specimens
Avoid gel-separator tubes; Serum
Collection Containers
Red top (no additive)
Sample Volume
1 mL
Minimum Volume
0.5 mL
Specimen Comment
Avoid gel-separator tubes.
Collection & Handling
Handling Information
Store and send frozen.
Stability
| Ambient | 24 hours |
|---|---|
| Refrigerated | 7 days |
| Frozen | 28 days |
Rejection Criteria
| Hemolysis | Gross |
|---|---|
| Lipemia | Gross |
| Icterus | Gross |
| Specimen | Gel separator tubes |
Test Version
13-Jan-2023
Performance / Interpretation
Method
LC-MS and Equilibrium Dialysis
Turnaround Time
16 days
Results
| Name | Units | Reference Range | Conversion Factor | |
|---|---|---|---|---|
| Estradiol, Free | pg/mL |
|
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| Estradiol | pg/mL |
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Test Location
Quest Diagnostics, California USA
Test Version
13-Jan-2023
Interface / Setup
HL7 Interface Codes
| Order Code | Result Codes | Units |
|---|---|---|
| ESTDFREE S | 64727ESTRADIOL, FREE | pg/mL |
| 64728ESTRADIOL | pg/mL |
Test Version
13-Jan-2023