Clinical Validation of the Fluispotter System for Serial Sampling of Venous Dried Blood Spots

Inclusion Criteria: * Male or female * Age ≥ 18 * Able to understand verbal and written instructions in Danish * Able and willing to sign and date the informed written consent form and letter of authority Exclusion Criteria: * Currently participating in a clinical trial evaluating drugs or medical devices * Known history of coagulation disorders * Currently taking regular medication (contraceptives, hormonal replacement therapy and antihistamines exempted) * Regular smoking or use of nicotine products * Pregnancy * Haematocrit \< 38% (male); \< 33% (female) * Haematocrit \> 52% (male); \> 48% (female) * C-reactive protein (CRP) \> 10 mg/dL * Body Mass Index (BMI) \> 30 * Known allergies or hypersensitivity to flushing solution constituents * Other factors which in the opinion of the investigator would interfere with the ability to provide informed consent, comply with study procedures/instructions, or possibly confound the interpretation of the study results or put the subject at undue risk