Ultrasound scanning is the most reliable method of diagnosing pregnancy and can be highly accurate. However, ~10% of established pregnancies fail, so a positive scan will not guarantee live cria.
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* Possible only a few days after conception.
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* For early scans, a rectal probe must be used.
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** Rarely practiced because the procedure causes much stress to the female, which is undesirable if she is pregnant.
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* More commonly scanned using a transabdominal probe from ~28 days onwards.