Median UE3 Concentration (ng/ml)
14 weak          0.40-0.51
15 weak          0.53-0.67
16 weak          0.69-0.84
17 weak          0.87-1.04
18 weak          1.07-1.25
19 weak          1.28-1.48
20 weak          1.51-1.72
21 weak          1.75-1.97
22 weak          2.00-2.23

See enclosed table for
weeks of gestation.