Gold serum separator (SST) tube

Immediately following collection, thoroughly mix sample by gently inverting 5 times

1. Allow sample to clot for a minimum of 30 minutes
2. Spin within 45 minutes of collection
3. Transfer serum to a Screw-cap polypropylene frozen transport vial/tube - 4mL (LabCorp), labelled as serum
4. Freeze

Screw-cap polypropylene frozen transport vial/tube - 4mL (LabCorp)

Lavender (EDTA), 4mL

Dk green heparin (Li or Na), no gel

Immediatley following collection, mix sample thoroughly by gentle inverting 8 - 10 times, to prevent clotting

1. Spin  within 45 minutes of collection
2. Transfer plasma to a Screw-cap polypropylene frozen transport vial/tube - 4mL (LabCorp), labelled as the appropriate plasma type
3. Freeze

Frozen (preferred) - 2 years

Refrigerated - 7 days

Ambient - 7 days

Liquid chromatography tandem mass spectrometry (LC/MS/MS)

Adult Males: 8.0 - 35

Fulvestrant (Faslodex®) or Mifepristone therapy may cause falsely elevated estradiol results when measured by common immunoassays, which include the estradiol test used at Allina Health Laboratory.

Estradiol testing should be performed by liquid chromatography/mass spectrometry (LC/MS) in patients receiving these drugs.