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. 2021 Sep 30;11(9):e047133. doi: 10.1136/bmjopen-2020-047133

Table 8.

Placenta scoring algorithm for histopathology and laboratory analyses

Score Description Membranes Time received* Lab action
1a Good  Complete <7 hours Process
  • Isolate cells

  • Preserve dissected sections

  • Fix for pathological analysis

1b Good  Incomplete
2a Good  Complete 7–12 hours
2b Good Incomplete
3 Variable Complete/incomplete 12–24 hours Process
  • Preserve dissected sections

  • Fix for pathological analysis

4 Variable Complete/incomplete 24–36 hours Variable
  • Preserve dissected sections

  • Fix for pathological analysis

5 Variable Complete/incomplete >36 hours Do not process
1. Fix for pathological analysis
6 Bad Complete/incomplete Do not process
2. Fix in formalin and discard

*Relative to delivery time.