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Test Code LAB149 C Reactive Protein

Clinical System Name

C Reactive Protein




Sample Requirements

Specimen: Whole Blood

Container(s): Lt. Green/Mint Top Lithium Heparin, Lt. Green/Lithium Heparin Microtainer, Gold SST, Gold Microtainer, Dark Green/Sodium Heparin, Lavender/EDTA, Lavender/EDTA Microtainer, Red

Preferred Vol: 1.0 mL

Minimum Vol: 0.5 mL


Note:  Method is affected by hemolysis.

Processing Instructions

Reject due to: Hemolysis, Age of specimen

Spin: Y

Aliquot: Y

Storage location: Core 5 Chemistry Refrigerator


Off-site collection:  Avoid hemolysis. Specimen should be centrifuged within 2 hours of collection. Spin blood and transfer serum or plasma to plastic tube and refrigerate or freeze.


Specimen Type Temperature Time
Serum or Plasma RT

≤ 4 h

Serum or Plasma 2-8 C

≤ 3 d

Serum or Plasma -20 C or -70 C

≤ 180 d


STAT Performed TAT
Y 24/7 1 h

Performing Laboratory

Seattle Children's Laboratory    


Department:  Core Chemistry

Phone Number206-987-2617 (Client Services)

CPT Codes



Method:  Immunorate by Vitros 4600

Analytical Volume:  0.02 mL + 0.03 mL dead space

Reference Range

All Ages  

≤ 0.8 mG/dL


CRP is synthesized by the liver and is one of the acute phase proteins. CRP concentration measurements are useful in the detection and evaluation of inflammatory disorders, tissue injury, and infections.