Which technology had the biggest impact on the capabilities of diagnostic testing?

The advent of polymerase chain reaction (PCR) technology had the biggest impact on diagnostic testing capabilities. PCR allows for the rapid amplification of specific DNA sequences, enabling the detection of pathogens and genetic mutations with high sensitivity and specificity. This technology revolutionized fields such as infectious disease diagnosis, genetic testing, and cancer detection, facilitating timely and accurate diagnoses that significantly enhance patient care. Its ability to produce results in a matter of hours compared to traditional methods has transformed clinical practice.