||2ml(1 ml min.) serum form 1SST. Ship refrigerated or frozen. Provide maternal Date of Birth (dd/mm/yy), LMP, USG report between 11-13 weeks gestation including CRL, NT & Nasal Bone, number of fetuses; Diabetic status, body weight; IVF, Smoking & Previous h/o Trisomy 21. Enclose Patient demographic details in Maternal Serum Screen Request Form (Form 11). Valid between 9-13 weeks gestation (Ideal 10-13 weeks).