C reactive protein

A c-reactive protein test measures the level of c-reactive protein (CRP) in a sample of your blood. Your liver makes CRP in response to inflammation.

By measuring the levels of c-reactive protein in your blood, a CRP test can tell your health care provider how much inflammation you have in your body.

Source: MedlinePlus, U.S. National Library of Medicine

Normal range

Result tiers from clinical guidelines, not a single normal band.

Source	Sex	Age	Range
American Board of Internal Medicine (Laboratory Test Reference Ranges)	All	all ages	<0.8 mg/dL
ARUP Laboratories Test Directory	All	all ages	<0.5 mg/dL
ARUP Laboratories Test Directory	All	all ages	<3 mg/L
Mayo Clinic Laboratories (Test Catalog)	All	all ages	<5 mg/L
Mayo Clinic Laboratories (Pediatric Test Catalog)	All	all ages	<5 mg/L

What an abnormal result can be associated with

A high result: Elevated circulating C-reactive protein concentration
A low result: Decreased circulating C-reactive protein concentration

Associations from LOINC2HPO (Human Phenotype Ontology). This is reference information, not a diagnosis: only a clinician can interpret your result in context.

details

Sample: Serum or plasma · LOINC
Collection: Serum gel tube · 0.5 mL · Mayo Clinic Laboratories (Test Catalog)
Part of: Bryan Johnson Blueprint
Listed under: Arthritis · Autoimmune Diseases · Crohn's Disease · Giant Cell Arteritis · Infectious Arthritis · Polymyalgia Rheumatica · Rheumatoid Arthritis · Ulcerative Colitis · Vasculitis
Code: LOINC 1988-5 · mg/dL
Also known as: CRP, Reac, React, Prot

See your own C reactive protein Add a lab report and it is drawn against your lab's range, over time. Upload a Blood Test