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Test Code CORT SUPP Cortisol Supression

Additional Codes

LAB13394

Collection Method

Venous collection

Minimum Volume

0.5ml

Container

Lt Green / Plasma Separator / Lithium Heparin

Acceptable Specimens

Serum:

  • Gold Top SST
  • Red Top


Plasma:

  • Light Geen Top (lithium heparin)

Reference or Target Ranges

Cortisol Suppression

<2 ug/dL

Comment 3

Comment 3: Single-dose Dexamethasone suppression test AM cortisol result interpretation:

<2.0 µg/dL Normal Response

2.0 - 10.0 µg/dL Equivocal

>10.0 µg/dL High probability of Cushing's syndrome False-positive tests can be seen in patients taking estrogens, obese patients, in those who have had a poor night's sleep, and in patients under acute emotional or physical stress.

Reportable Units

µg/dL

Critical Value

Not defined for this assay

Reasons for Rejection

Hemolysis Threshold 500 mg/dL
Icterus Threshold 25 mg/dL
Lipemia Threshold 1500 mg/dL
Other QNS, contaminated, improperly Labeled, improper specimen typ

Specimen Stability

Ambient 24 hours
Refrigerated (4°C to 8°C) 4 days
Frozen(-40°C to 0°C) 12 months

Performance Information

Days and Time Performed 24/7
Expected Turn Around Time Stat: 1 hour
Routine: 4 hours
Stat Availability Yes
Performing Bench CPH Chemistry
Methodology/Method Description Roche Cobas

CPT Codes

82533

Last review/edit date

March 2024