The human body has a remarkable indicator of inflammation and infection: C-reactive protein, or CRP. This protein, produced in the liver, acts as a reliable biomarker that provides doctors with important clues about inflammatory processes in the body[1].
In healthy individuals, the CRP level is low, below 5 milligrams per liter of blood. However, as soon as inflammation or infection occurs, the liver responds with increased CRP production. Within a few hours, the level can rise 10 to 1000 times[4][5].
CRP levels are determined through a simple blood draw. A doctor uses a fine needle to take a small amount of blood from a vein in the arm. The procedure takes only about five minutes and involves minimal risks[2].
The CRP test is particularly valuable in distinguishing between bacterial and viral infections. While bacterial infections lead to a significant increase in CRP, the level usually remains in the normal range for viral illnesses[1]. This helps doctors decide whether antibiotic therapy is necessary.
Elevated CRP levels can indicate various conditions, including pneumonia, meningitis, rheumatic diseases, or even tumors. The level also rises after surgery or a heart attack[5]. The magnitude of the CRP level often correlates with the severity of the illness. In mild conditions, the level is usually below 50 mg/l, while it can rise above 100 mg/l in severe bacterial infections[5].
The CRP test has established itself as an indispensable tool in modern medicine. It not only enables early detection of inflammation but also serves to monitor the course of treatment. As soon as therapy is effective, the CRP level decreases again – an important indicator of treatment success[2].
Sources:
[1] C-reactive protein » Blood count – Explanation » – Internisten im Netz » https://www.internisten-im-netz.de/mediathek/blutbild-erklaerung/c-reaktives-protein.html
[2] C-reactive protein (CRP) test: application, preparation and… https://www.medicoverhospitals.in/de/diagnostics-pathology-tests/crp-test
[3] The highly sensitive CRP blood test – Meinlabtest.de https://meinlabtest.de/crp-test.html
[4] CRP: What your lab value reveals – netDoktor.de https://www.netdoktor.de/laborwerte/crp/
[5] CRP » Inflammation parameter C-reactive protein | MeinMed.at https://www.meinmed.at/untersuchung/crp/2680
[6] CRP – C-reactive protein | Health portal – gesundheit.gv https://www.gesundheit.gv.at/labor/laborwerte/infektionen-bakterien/crp.html
[7] C-reactive protein – DocCheck Flexikon https://flexikon.doccheck.com/de/C-reaktives_Protein
[8] CRP – The inflammation parameter – nal von minden https://nal-vonminden.com/deu/inside-diagnostics/crp.html
[9] C-reactive protein (CRP) – Health information.de https://www.gesundheitsinformation.de/c-reaktives-protein-crp.html
[10] Diagnostics in infectiology | C-reactive protein (CRP) https://www.springermedizin.de/diagnostik-in-der-infektiologie/fieber/c-reaktives-protein-crp-ein-diagnostischer-entzuendungsmarker-am/26503840
[11] CRP rapid test inflammation parameter C-reactive protein https://self-diagnostics.com/de/c-reaktives-protein-crp.html
[12] CRP Check: Determine CRP value in the pharmacy https://www.rotpunkt-apotheken.ch/serviceleistungen/crp-check
