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ALA dehydratase, whole blood-994

Test info

Test name:

ALA dehydratase, whole blood

Test number:

994

Excellian order number:

LAB994

Abbreviation:

MSO

Alternate names:

Aminolevulinic Acid Dehydratase
Porphobilinogen (PBG) Synthase
ALAD (Aminolevulinic Acid Dehydratase) Deficiency Porphyria (ADP)
Doss Porphyria

Useful for:

This test is the preferred test for the confirmation of a diagnosis of aminolevulinic acid dehydratase deficiency porphyria

Limitations:

This test is not useful for detecting lead intoxication.

Specimen

Patient preparation information:

Patient should abstain from alcohol for 24 hours

Specimen type:

Sodium (Na) heparin whole blood

Collection container:

Dk green Sodium heparin (Na hep), no gel

Volume:

4.0 mL

Minimum volume:

3.0 mL

Collection instructions:

Place the specimen on wet ice immediately following collection

Processing instructions:

Do not spin
Do not open tube
Submit original tube

Transport container:

Dk green (Na heparin) tube, unspun and unopened

Alternate specimen type:

EDTA whole blood

Alternate collection container:

Lavender (EDTA), 4mL

Required forms/information:

Include a list of medications patient is currently prescribed

Transport and stability:

Refrigerated (preferred) - 7 days

Ambient - 4 days

Frozen - NO

Reason for rejection:

Hemolysis
Samples received frozen

Performance

Performing lab:

Mayo Clinic Laboratories (ALAD) via LabCorp (811129): R-NX

Days set up:

TAT:

2 - 8 days

Method:

Enzymatic End Point/Spectrofluorometric

Clinical and Interpretive info

Reference ranges:

≥ 4.0 nmol/L/sec
3.5 - 3.9 nmol/L/sec (indeterminate)
< 3.5 nmol/L/sec (diminished)

Clinical information:

Mayo Clinical & Interpretive link

Billing

CPT codes:

82657

LOINC code:

Result 59462-2

Tracking

Date created:

12/11/2007

Revised date:

08/13/2026

Review date:

08/13/2026