Quantitative Sensory Testing (QST) is used to test somatosensory functioning in patients with low back pain (LBP) and most performed on people with chronic LBP in secondary/tertiary health care facilities. Studies using QST-testing on LBP populations in primary care are scarce. Central Sensitization Inventory (CSI) measures central sensitization (CS)-related symptoms and studies investigating the differences between QST-testing and participants with LBP with a positive and negative score on the CSI questionnaire are also rare. This case-control study investigates differences of an extensive QST-measurement between patients with acute, chronic LBP and healthy controls in primary care. Secondary aim is to investigate differences of an extensive QST-measurement between "CS" and "no-CS" group.