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Laboratory Medicine

Test Directory / C-Reactive Protein

C-Reactive Protein

Brown clotted serum, gel barrier or lithium heparin

TestC-Reactive Protein
Common AbbreviationsCRP
Tube typeBrown clotted serum, gel barrier or lithium heparin
Clinical IndicationCRP is an acute phase reactant, used to assess the progression of inflammation and infection. Levels are particularly increased in bacterial infection and peak at 48 hours following exposure.
Specimen TypeBlood
Sample typeSerum
Minimum Volume0.5mL If requesting more than 10 tests please send an additional brown clotted serum sample.
Special PrecautionsNo special requirements
Stability2 weeks at room temperature, 3 weeks at 2-8°C and 12 months at -20°C
Turnaround TimeUrgent: 2 hours Inpatient: 4 hours Outpatient/ GP: 24 hours
LaboratoryYork and Scarborough
Reference Interval <5 mg/L (Quoted by the manufacturer)
LimitationsCRP measurement may be affected by lipaemia and monoclonal gammopathies (especially Waldenstroms macroglobulinaemia). At extremely high concentrations (>750 mg/L) the assay may give falsely low results. Carboxypenicillins significantly decrease values.
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