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Test Mnemonic 21DOC 21-Deoxycortisol, Serum

Useful For

As an adjunct to measurement of 17-hydroxyprogesterone, androstenedione, and cortisol in the diagnosis of difficult cases of suspected 21-hydroxylase (CYP21A2) deficiency

 

Identifying heterozygote CYP21A2 deficiency carriers

 

As an adjunct to measurements of 17-hydroxyprogesterone, androstenedione, testosterone, and, in females, estradiol in the follow-up of children with CYP21A2 deficiency

Testing Algorithm

See Steroid Pathways in Special Instructions.

Special Instructions

Method Name

Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)

Reporting Name

21-Deoxycortisol, S

Specimen Type

Serum


Specimen Required


Container/Tube:

Preferred: Red top

Acceptable: Serum gel

Specimen Volume: 0.5 mL

Collection Instructions: Morning (8 a.m.) specimen is preferred.


Specimen Minimum Volume

0.4 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Refrigerated (preferred) 21 days
  Frozen  21 days
  Ambient  14 days

Reference Values

<5.0 ng/dL

Reference values apply to all ages.

Day(s) and Time(s) Performed

Tuesday; 10 a.m.

Performing Laboratory

Mayo Medical Laboratories in Rochester

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information

82542

LOINC Code Information

Test ID Test Order Name Order LOINC Value
21DOC 21-Deoxycortisol, S 74872-3

 

Result ID Test Result Name Result LOINC Value
89477 21-Deoxycortisol, S 74872-3