ALADW - Overview: Aminolevulinic Acid Dehydratase (ALA-D), Washed Erythrocytes

Test Catalog

Test Name

Test ID: ALADW    
Aminolevulinic Acid Dehydratase (ALA-D), Washed Erythrocytes

Useful For Suggests clinical disorders or settings where the test may be helpful

Confirmation of a diagnosis of aminolevulinic acid dehydratase deficiency porphyria

Genetics Test Information Provides information that may help with selection of the correct test or proper submission of the test request

Aminolevulinic acid dehydratase (ALAD) activity is inhibited in other situations including hereditary tyrosinemia type 1, lead intoxication, and exposure to styrene, trichloroethylene, or bromobenzene. These causes should be ruled out when considering a diagnosis of ALAD deficiency porphyria (ADP). This method will not exhibit a decreased ALAD enzyme activity due to lead intoxication. This test should only be ordered when the specimen will be received at Mayo Medical Laboratories within 24 hours of collection.


The preferred test for analysis of ALAD is ALAD / Aminolevulinic Acid Dehydratase (ALAD), Whole Blood.


This test will not detect lead intoxication.

Testing Algorithm Delineates situation(s) when tests are added to the initial order. This includes reflex and additional tests.

The following algorithms are available in Special Instructions:

-Porphyria (Acute) Testing Algorithm

-Porphyria (Cutaneous) Testing Algorithm

Special Instructions and Forms Describes specimen collection and preparation information, test algorithms, and other information pertinent to test. Also includes pertinent information and consent forms to be used when requesting a particular test

Method Name A short description of the method used to perform the test

Enzymatic End point/Spectrofluorometric

NY State Approved Indicates the status of NY State approval and if the test is orderable for NY State clients.


Reporting Name A shorter/abbreviated version of the Published Name for a test; an abbreviated test name

ALA Dehydratase, RBC

Aliases Lists additional common names for a test, as an aid in searching

ALA-D (Aminolevulinic Acid Dehydratase) Deficiency Porphyria (ADP)
Porphobilinogen (PBG) Synthase
Doss Porphyria