Screening for the Transthyretin-Related Familial Amyloidotic Polyneuropathy (TTR FAP)

Inclusion Criteria: * Informed consent is obtained from the participant * The participant is aged between 18 and 85 years of age * The participant is diagnosed with small fiber polyneuropathy of no obvious etiology * The participant has no diagnosis of alcoholism, according to International Guidelines * The participant has not undergone chemotherapy for carcinoma Exclusion Criteria: * Inability to provide informed consent * The participant is younger than 18 years or older than 85 years of age * The etiology of the small fiber polyneuropathy is clearly determined * The participant has a diagnosis of alcoholism, according to International Guidelines * The participant has undergone chemotherapy for carcinoma