Kalousek et al listed placental weights for pregnancies of 8 to 18 weeks. This covers a period that is not included in many series, which tend to focus on the second and third trimester.
Fetal Age in Weeks
Placental Weight in grams
8
1.6
9
15.2
10
28.8
11
42.4
12
56.1
13
69.7
14
83.3
15
96.9
16
110.5
17
124.2
18
137.8
When evaluated in Mini-Tab:
placental weight in grams from 8 to 18 weeks =
= (13.62 * (weeks gestation)) - 107.4
week gestation =
= (0.07342 * (placental weight)) + 7.885
Limitations:
• The number of cases were relatively small. A distribution by size or race is not given.
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