Background and method The cross-reactivity of human chorionic
gonadotrophin (hCG) in the new DPC Immulite 2000 luteinizing hormone immunoassay was
studied using sera from healthy pregnant women and pooled serum spiked with hCG
standard IRP 75/537. Results and Conclusion Significant positive bias
was seen in sera from pregnant women and in IRP 75/537 spiked serum.