20 ML (15 ML MIN.) AMNIOTIC FLUID IN A STERILE SCREW-CAPPED CONTAINER. SAMPLE TO BE COLLECTED UNDER STRICT ASEPTIC PRECAUTIONS. SHIP REFRIGERATED IMMEDIATELY. DO NOT FREEZE. SPECIMEN MUST REACH WITHIN 48 HOURS. TEST IS RECOMMENDED BETWEEN 15-20 WEEKS OF GESTATION. DULY FILLED FORM G, CHROMOSOME & FISH ANALYSIS REQUISITION FORM & CONSENT FORM FOR PRENATAL GENETIC TESTING IS MANDATORY. SAMPLES SHALL BE ACCEPTED ONLY FROM REGISTERED GENETICS CLINICS UNDER PCPNDT ACT. IT IS RECOMMENDED TO DISCARD THE INITIAL 2-3 ML OF ASPIRATE, SINCE THIS FIRST DRAW MAY CONTAIN SOME MATERNAL CELLS TRAPPED WITHIN THE NEEDLE DURING INSERTION.