Cortisol


Abbrev Code:CORT   
Order Code:LAB61Order Name:Cortisol
Order Instructions:If ordered as baseline, 30 m or 60 m use these codes: CORTB (LAB3407), CORT30 (LAB3405) and CORT60 (LAB3406). For other specific times, e.g., 15 m, use CORT (LAB61).
Synonyms:Compound F; Hydrocortisone, Serum; Dexamethasone Suppression Test
Methodology:Roche: Immunoassay using competition principle
CPT Codes: 82533 x1, 82533 x1
Turnaround Time:Performed and reported 24 hours/day.
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Collection Instructions

Specimen:Blood
Optimal Volume:2.5 mL
Minimum\Peds Volume:0.6 mL
Container:Green (lithium heparin, gel)
Alternate Containers: Green (lithium heparin, no gel), Green (lithium heparin, gel) on ICE, Red (no gel), Red (gel)
Collection Instructions:Blood should be collected at 8 AM and 4 PM to evaluate baseline diurnal variation.
Causes for Rejection:Gross hemolysis


Processing and Shipping

Specimen Processing:Centrifuge and aliquot 1.25 mL, 0.2 mL minimum. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature to arrive within 48 hours of collection. Alternatively, ship on dry ice.
Stability:1 day at room temperature; 4 days refrigerated; 12 months frozen.
Test Performed at or Referral Lab Chemistry  (Roche-UMMC East)


Interpretive

Critical Range:>150.0 μg/dL
Reference Range:For infants less than 6 months: "Infants typically develop adult values and diurnal variation of cortisol between 2-6 monnths of age. Therefore, cortisol levels measured in infants less than 6 months old should be interpreted accordingly." Ref: Early Hum Dev: 2003 Aug; 73(1-2); 39-52.
6 mo & older; 6-10 am blood collection 4-22 μg/dL
6 mo & older; 4-8 pm blood collection 3-17 μg/dL
Dexamethasone Suppression:  1 mg
dexamethasone given at midnight
8 am blood collection
≤ 5 μg/dL
8 h post 1 mg dose
 
Limitations:Circulating cortisol results from patients receiving Prednisolone or Prednisone therapy may be falsely elevated. Exercise caution with cortisol determinations for patients undergoing therapy with these and structurally related synthetic corticosteroids.
Use:Best used for evaluating adequacy of adrenal or pituitary function.


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