| Material | serum 1 ml |
| Method | LCMS |
| Species list | horse, donkey, llama, alpaca, others on request |
| Duration | 5 days |
| Remark | - In pregnant mares, oestrone sulphate is secreted in increasing concentrations from the 50th/ day onwards. The oestrone sulphate level drops to baseline level after abortion or resorption within a few days. Reliable diagnosis is possible from day 110 onwards.
- Mare: To determine an intact pregnancy
- Llama/alpaca: diagnosis of late pregnancy (from 10th/11th month onwards). In the earlier stages of pregnancy, we recommend to determine progesterone.
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