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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: C-Reactive Protein

Test Code(s): CRP / CRPN

CPT Code(s): 86140

Methodology: Nephelometry

Request Form: UWHC DOWNTIME Laboratory Request Form (UWH IPDOWNTIME, 4004202); Write in test if not on form.

Days Performed: Daily, 24 hours.

Turnaround Time: Stat: 1 hour.
Routine: 4 hours.

Specimen Requirements

Specimen: Blood

Collection Container: Preferred: Green cap with yellow ring (PST)
Also Acceptable: Green top, Red cap with yellow ring (SST), Red top

Collection Volume: Preferred: 1 mL
Pediatrics: 0.4 mL

Sample Analyzed: Plasma or serum

Volume Required: Preferred: 0.5 mL
Pediatrics: 0.2 mL

Specimen Processing: Centrifuge.  If a complete barrier has not formed, transfer cell-free plasma/serum to plastic vial.  Refrigerate.

Specimen Transport: Transport specimen to UWHC Core Laboratory (B4/220). Transport with coolant pack if coming from outreach location.

Stability: Refrigerated: 8 days
Frozen: 8 months


Reference Interval:

18 years and up: 0-1 mg/dL

Additional Information:

Levels can rise to over 30 mg/dL within 24 to 48 hours of an acute insult such as major surgery or a myocardial infarction. It can fall just as rapidly with spontaneous or therapeutically induced remission of disease activity.

CRP Inflammation C Reactive Protein Inflammation

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