Labsystems Diagnostics introduced world's first fluorometric microplate based assay for screening Phenyl Alanine in newborns to detect Phenylketonuria (PKU) and now on tandem MS along with more than 50 disorders. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) increased the screening possibilities by monitoring levels of amino acids and acylacarnitines. These tests can also be used in screening positive samples as a second tier confirmation test to differentiate between true and false positive samples. LC-MS/MS can detect several disorders with a single injection, which is important in high throughput labs.