NORMAL SERUM LEVELS OF PROGESTAGENS FOR EQUINE:

Days Post Ovulation	ng/mL
0	Less than 1.0
2	1.0 - 3.0
5 - 12	4.0 - 10.0
15 - 18	3.0 - 10.0
21	3.0 - 10.0
25 - 30	2.5 - 10.0
45	4.0 - 10.0
60	4.0 - 15.0
80 - 315	5.0 - 10.0
316 to term	20.0 - 40.0'

Results are those used by BET Laboratories and were generated by radioimmunoassay (RIA), which measures progesterone and some of its major metabolites (progestagens).