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Test Code COR CORTISOL, SERUM

Important Note

24 hours before this blood test: Do not take any supplements containing biotin or Vitamin B7 which are commonly found in hair, skin, and nail supplements, and multi-vitamins.

Sufficient Biotin concentrations in serum can lead to falsely increased results.

Methodology

Competitive Immunoassay Utilizing Enhanced Chemiluminescence

Specimen Requirements

Submit only 1 of the following specimens:

 

PREFERRED:

Serum

Serum Gel Tube

Container/Tube: Serum gel tube(s)
Specimen Volume: 1 mL (minimum volume: 0.5 mL) of serum-Hemolyzed specimen is not acceptable.

Collection Instructions:

  1. Spin down within 4 hours of draw.
  2. Morning (8 a.m.) and afternoon (4 p.m.) specimens are preferred.
  3. Label specimen appropriately (serum).

 

Alternate:

Serum

Plain, Red-Top Tube

Container/Tube: Plain, red-top tube(s)
Specimen Volume: 1 mL (minimum volume: 0.5 mL) of serum-Hemolyzed specimen is not acceptable.

Collection Instructions:

  1. Spin down within 4 hours of draw.
  2. Morning (8 a.m.) and afternoon (4 p.m.) specimens are preferred.
  3. Label specimen appropriately (serum).

 

Plasma

Container/Tube: Green-top (lithium heparin) tube(s)

Specimen Volume: 1 mL (minimum volume: 0.5 mL) of plasma-Hemolyzed specimen is not acceptable.

Collection Instructions:

  1. Spin down within 4 hours of draw.
  2. Morning (8 a.m.) and afternoon (4 p.m.) specimens are preferred.
  3. Label specimen appropriately (serum).

Day(s) Test Set Up

Monday through Friday

Reference Values

A.M. (0600-1030)

4.5-22.7 µg/dL

P.M. (1530-2300)

1.7-14.1 µg/dL

RANDOM

No established reference values

Performing Laboratory

Logan Health Medical Center-Chemistry

Test Classification and CPT Coding

82533

Specimen Transport Temperature

Refrigerate