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

Table 2 Guidelines for assigning projected due date

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
<9 0/7 weeks	≤5 days	LMP
≥9 0/7 and ≤13 6/7 weeks	>7 days	CRL
≥9 0/7 and ≤13 6/7 weeks	≤7 days	LMP

ISSN: 1471-2393