wie lange dauert ein blutbild — what are common causes?

The provided knowledge contexts do not contain specific information about how long a blood test takes or common causes for abnormal results. Generally, blood draw takes minutes; lab analysis can take hours to days depending on the panel. Common causes for abnormal values include infections, inflammation, nutrient deficiencies, medications, or chronic diseases. However, since the contexts focus on gut microbiome and DNA tests, I cannot give an evidence-based answer from this material. For medical concerns, please consult a physician.