Gestational Age in Dogs and Cats From Ultrasonographic Measurements
Dogs: Gestational Age ± 3 Days | Cats: Gestational Age ± 2 Days | |
|---|---|---|
< 40 days | > 40 days | > 40 days |
(6 × GSD) + 20 | (15 × BP) + 20 | 25 × BP + 3 |
(3 × CRL) + 27 | (7 × BD) + 29 | 11 × BD + 21 |
NA | (6 × HD) + (3 × BD) + 30 | NA |
Days before parturition: 64–66 minus gestational age | Days before parturition: 61 minus gestational age | |
Abbreviations: BD, body diameter at the liver, cm; BP, biparietal diameter, cm; CRL, crown rump length, cm; GSD, gestational sac diameter, cm; NA, not applicable. | ||
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