User Guide - PregSafe

EDDTo enter an estimated date of delivery, tick the checkbox and type in the EDD or chooseit using the month view calendar. If you know for certain that the EDD was estimatedbased on ultrasound measurement, check the Determined by U/S checkbox so that thecalculation parameters appropriate to ultrasound dated gestational age will be applied inthe risk calculation.When you have finished entering GA information, click the Next button or key to save the record and move to the requisition screen, or the Finish button or tosave the pregnancy information and return to the Add/View patient screen. A Dialog boxwill appear, suggesting the best GA estimation method from among the information youhave entered. Click OK to accept the recommendation or click Cancel to choose the GAestimation method later.Note: If you wish to remove entries from any of the GA estimation fields, do so by usingthe spacebar or mouse to remove the tick from the associated checkbox.Nasal BoneIf you are doing first trimester screening and if you have entered both NT and CRLmeasurements, the field for entry of Nasal Bone will be enabled. The possible entries forthis field are Unknown, Present, Absent Black and, Absent Not Black. Black or Not Blackrefers to the race of the fetus. The absence of Nasal Bone indicates increased risk ofDown Syndrome in both Black and non-Black fetuses, but the increase in the risk isgreater in non-Black fetuses.TwinsFor a twin pregnancy, you may enterchorionicity and separate NT and CRLvalues and Nasal Bone for each fetus.• For chorionicity, you may enterdichorionic, monochorionic or unknown.If you enter unknown, the calculation ofrisk will be as for a dichorionic pregnancy.• The NT MoM of each fetus iscalculated based on the respective CRLof the fetus.• The GA for the pregnancy iscalculated based on the CRL of FetusA, so it is very important always to enterthe larger fetus as fetus A.• It is assumed that both fetuses will beeither Black or Non-Black.• For Twin pregnancies, the calculatedrisk is the risk for the pregnancy, not foreach individual fetus.14