The CRP Semi-Quantitative Rapid Test Device (Whole Blood/Serum/Plasma) is a semi-quantitative, membrane based immunoassay for the detection of CRP in whole blood, serum or plasma specimens. The membrane is pre-coated with anti-CRP antibodies on the test line region. During testing, specimen reacts with the particles coated with anti-CRP antibodies. The mixture migrates upward on the membrane by capillary action to react with anti-CRP antibodies on the membrane and generate a colored line. If the intensity of the test line (T) is weaker than reference line 2 (R2), it indicates that the CRP level in the specimen is between 1-3 mg/L. If the intensity of the test line (T) is weaker than reference line 1 (R1) but stronger than reference line 2 (R2), it indicates that the CRP level in the specimen is between 3-10 mg/L. If the intensity of the test line (T) is stronger than the reference line (R1), it indicates that the CRP level is above 10 mg/L. To serve as a procedural control, reference line 1 and 2 (R1 and R2) will always appear in reference line region indicating that proper volume of specimen has been added and membrane wicking has occurred.