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