|Sample Requirement||Turnaround Time|
|Serum||2-5 working days|
Oestrone sulphate may be detected in the serum/plasma of mares over 120 days pregnant. At that time, levels of >100 ng/ ml are usually found (0-25 ng/ml in non- pregnant mares). Most of the oestrone sulphate peak originates from the foetal gonads so this may be a useful test of foetal viability as well as a pregnancy test. Levels fall during the last few weeks of pregnancy.