We evaluated a new rapid semi-quantitative immunometric assay of C-reactive protein (CRP) as a screening test for sepsis by comparison with an automated nephelometric method. Plasma samples (n = 101) from preterm infants during the first week of life were saved for CRP analyses. We measured CRP by the Nycocard semiquantitative method and compared the results with those obtained with a Behring Nephelometer. A CRP value less than 10 mg/L was considered to be negative for infection. All CRP results read as less than 10 mg/L (negative) by the Nycocard method were also less than 10 mg/L by the comparison method, and all CRP values found to be greater than 20 mg/L (positive) by the Nycocard method were also positive by the comparison method. Results in the 10-20 mg/L range were considered equivocal. We conclude that the Nycocard CRP semi-quantitative method is a rapid and useful screening test for sepsis in preterm infants.
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Although it is not a specific marker for a particular pathology, it is used as a generic diagnostic indicator of infections and inflammations, as well as to monitor patients&#; reactions to therapies and postoperative course. Levels of this protein in blood are high during bacterial infections, while they are restrained during viral infections. For this reason C-Reactive Protein assay can be a useful tool in defining the cause of an inflammation.
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