Grade I: Placenta implanted in the lower segment, but lower edge does not reach the internal os
Grade II: The lower edge of the low lying placenta reaches but does not cover the internal os
Grade III: The placenta covers the internal os asymmetrically
Grade IV: Placenta covers internal os symmetrically
Grades I & II are minor or marginal placenta previa.
Grades III & IV are major or central placenta previa.
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