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Table 2 Guidelines for assigning projected due date

From: A description of the methods of the aspirin supplementation for pregnancy indicated risk reduction in nulliparas (ASPIRIN) study

Gestational age by LMP Difference between LMP and US GA Basis for assigning projected due date
Unknown/Not available N/A CRL
<9 0/7 weeks >5 days CRL
≤5 days LMP
≥9 0/7 and ≤13 6/7 weeks >7 days CRL
≤7 days LMP