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What does the antimitochondrial antibody mean?

D R Triger, C A Charlton, A M Ward

|October 1, 1982

Summary

Antimitochondrial antibodies (AMA) are not specific for primary biliary cirrhosis (PBC) in routine screening. Many patients with positive AMA lack liver disease, suggesting AMA alone is insufficient for PBC diagnosis.

Area of Science:

Immunology
Hepatology
Autoimmunity

Background:

Antimitochondrial antibodies (AMA) are associated with primary biliary cirrhosis (PBC).
The specificity of AMA testing in routine immunology requires further evaluation.

Purpose of the Study:

To assess the diagnostic utility of AMA in a routine immunology setting.
To determine if AMA can predict primary biliary cirrhosis development.

Main Methods:

Prospective survey of sera submitted to a routine immunology laboratory.
Detection of AMA using standard immunofluorescent techniques.
Correlation of AMA positivity with clinical and biochemical evidence of liver disease.

Main Results:

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AMA detected in 1.64% of sera (69/4200).

Only 9/69 patients had confirmed primary biliary cirrhosis; 44/69 had no liver disease.

AMA frequency was similar in autoimmune disorders and other conditions.

AMA titre and immunoglobulin subclass did not differentiate PBC from non-PBC patients.

AMA-positive patients without liver disease were uniformly distributed, unlike PBC cases.

Conclusions:

AMA testing alone is not a specific screening tool for primary biliary cirrhosis in the absence of clinical liver disease.
AMA may indicate a predisposition to PBC, necessitating further longitudinal studies.
Environmental factors might play a role in PBC development.