The screening test for nine common recessive genetic diseases in maternal plasma, including genetic mutations of HBA1 and HBA2 (Alpha thalassemia), HBB (Beta thalassemia), GALT (metabolic disorder of galactose), PAH (urine phenylketone), G6PD (glucose-6-phosphate dehydrogenase deficiency), SLC25A13 (solute carrier family 25 member 13), SRD5A2 (lack of 5-alpha reductase), GAA (metabolic disease of glycogen type 2, Pompe disease), and ATP7B (metabolic disorder of Cu, Wilson disease), were absent. The gene discussed is SLC25A13; the disease is disorder of galactose metabolism.