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Our Testing   »   5-aminolaevulinate - urine

5-aminolaevulinate - urine
Product code : 5-aminolaevulinate - urine
5-aminolaevulinate - urine

 

ItemProcess
Specimen Random urine; protect from light.
Method Spectrophotometry.
Reference Interval

<3.8 mmol/mol creatinine
<35 mmol/L.

Application

Diagnosis of acute neurological porphyrias during an acute episode. However, urine porphobilinogen is the preferred test, except for plumboporphyria.

Limited value in the diagnosis of lead poisoning as the test is less sensitive than blood lead and may be negative in organic lead poisoning (leaded petrol).

Interpretation

Increased levels are found during acute attacks of acute intermittent porphyria, hereditary coproporphyria, porphyria variegata and plumboporphyria.

In inorganic lead poisoning, porphobilinogen synthetase is inhibited, resulting in increased levels of 5-aminolaevulinate. However, the test does not reliably detect lead exposure in the distant past as, with time, lead is sequestered in bone. The test is also unreliable in patients with very recent exposure to organic lead eg, petrol sniffing.

Increased levels are found in patients with type 1 tyrosinaemia


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