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Table 2 Normal upper limits for the combined thickness of the uterus and the placenta (CTUP) during late gestation [11, 20].

From: High risk pregnant mare

Gestation length

Normal CTUP

151 – 270 days

<7 mm

271 – 300 days

<8 mm

301 – 330 days

<10 mm

331 –

<12 mm