was kostet ein großes blutbild beim hausarzt — what are common causes?

The cost of a complete blood count (CBC) at a general practitioner in Germany is usually covered by statutory health insurance if medically indicated; otherwise, as a private service, it may cost around €20–50. The question 'what are common causes?' likely refers to common reasons for ordering a CBC: suspected infection, anemia, inflammation, kidney or liver disease, thyroid issues, or general fatigue. The provided context contains no information about blood tests—only DNA tests. Therefore, this answer is based on general medical practice, not on the given sources.