Provided herein are methods, combinations, and kits for screening and treating a subject. In practicing the methods a sample, such as urine, blood, plasma, saliva, cervical fluid, vaginal fluid or a tissue sample, is obtained from a subject if the level of a marker, such as a foetal restricted antigen or estriol, is indicative of a risk of imminent or preterm delivery, a progestational agent is administered to the subject. BY virtue of administration of the agent delivery can be delayed.
