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GENERAL INFORMATION

LINKS

Mayo Clinic

Mayo Clinic Laboratories

Test Code CORT Cortisol, Plasma or Serum

Performing Laboratory

Trinity Health Grand Haven

Specimen Requirements

Submit only 1 of the following specimens:

 

Preferred:

Specimen Type: Plasma

Container/Tube: Mint-green top (lithium heparin gel)

Specimen Volume: 1 mL

Collection Instruction: 

1. Label specimen as plasma.

2. Avoid hemolysis and lipemia.

 

Acceptable:

Specimen Type: Serum

Container/Tube: Serum gel or red top

Specimen Volume: 1 mL

Collection Instruction: 

1. Label specimen as serum.

2. Avoid hemolysis and lipemia.

Reference Values

Before 10:00 a.m.: 4.5-22.7 mg/dL

After 4:00 p.m.: 1.7-14.1 mg/dL

Day(s) Test Set Up

Monday, Wednesday, Friday

Methodology

Competitive Immunoassay

Specimen Transport Temperature

Ambient

Test Classification and CPT Coding

82533

Specimen Storage and Stability

Specimen Type Temperature Time
Serum/Plasma Room Temp < 4 hours
  Refrigerated (primary) <5 days
  Frozen <4 weeks