was kostet ein gentest erbkrankheiten — what symptoms are typical?

The question about the cost of genetic tests for hereditary diseases and typical symptoms cannot be answered from the provided context. The given information covers microbiome tests for children and some gene variants (ALDH2, VDR), but contains no pricing or symptom descriptions for hereditary disease tests. Generally, costs vary widely—from roughly €100 to over €2000 depending on scope (single gene, panel, exome/genome) and provider (direct-to-consumer vs. clinical). Typical symptoms are disease-specific: e.g., neurological issues, metabolic disorders, or elevated cancer risks. Direct-to-consumer tests often have limited clinical validity and should not be used for diagnosis. If a hereditary disease is suspected, genetic counseling and confirmatory lab testing are essential. The evidence is rated 'unclear' because the context lacks relevant data.