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Test Code N.ESTRA ESTRADIOL

Important Note

This assay should not be used to monitor estradiol levels in patients taking either drug Fulvestrant (Faslodex®) or Mifepristone (Mifeprex®) due to interference giving falsely elevated results. Chromatography should be used as an alternative method. 

Methodology

Automated Chemistry Analyzer

Specimen Requirements

Specimen Type: Serum or Plasma 
Container/Tube: SST or Lithium Heparin 

Acceptable: Red top
Specimen Volume: 1 mL (minimum 0.5) 
Collection Instructions:  

  1. Allow specimen to clot completely if a serum tube (SST) was used. 
  2. Separate serum (SST) or plasma (Lithium Heparin) from cells within 24 hours and transport refrigerated. If red top tube is collected, separate serum from cells within 2 hours and place in separate plastic tube. 
  3. Properly label tube with patient's name, DOB, requisition number and type of tube, i.e. LiHep or NaHep etc.

Specimen Rejection

  1. Exceeds stability  
  2. Gross hemolysis 
  3. Unlabeled/mislabeled specimen 

Maximum Laboratory Time

24 to 48 hours

Specimen Transport/Stability

Refrigerated: 24 hours on gel, 6 days poured off

 

If there will be delay in transport, centrifuge specimen according to instructions above and transfer to properly labeled aliquot container.

Test Classification and CPT Coding

82670

Day(s) Test Set Up

Daily

Reference Ranges

Estradiol              pg/mL
Female Ranges  
Follicular         21 - 251
Mid-Cycle         38 - 649
Luteal         21 - 312
Post-Menopausal Females      < 10 - 28
Post-Menopausal Females on HRT

<10-144
Male Ranges          11 - 44