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Test Code DEXA Dexamethasone, Serum or Plasma by LC-MS/MS

Clinical Indications

Compliance assessment of dexamethasone suppression testing.

Additional Test Codes

Epic Order Name: DEXAMETHASON SERUM OR PLASMA LC-MS/MS (aka DEXA)
Sunquest Order Code: DEXA
Epic Px Code: LAB3052

Specimen Collection Type

Gold-top serum (preferred)
Red-top serum
Lavender-top EDTA plasma
Green-top (sodium or lithium heparin) plasma

Minimum Collection Volume

1.5 mL

Reference Range

Adults baseline: Less than 50 ng/dL
8:00 AM draw following 1 mg dexamethasone between 11:00 pm and 12:00 am the previous evening: 140 – 295 ng/dL
8:00 AM draw following 8 mg dexamethasone (4 × 2 mg doses) between 11:00 pm and 12:00 am the previous evening: 1600 – 2850 ng/dL

Critical Value

N/A

Interpretation

N/A

Rejection Criteria

N/A

Specimen Availability for Add-on Testing

2 days (if serum/plasma was separated from cells within 2 hours of collection)

Specimen Stability

Refrigerated (preferred): 1 week
Frozen: 6 months
Ambient: Unacceptable

Day(s) Performed

Wed, Sat

Performing Lab - Department

TUKHS-BH-Mail Outs

CPT Code

80299

LOINC Code

14062-4

Test Alias

N/A

Additional Information / Notes

N/A