Cluster 175: beta chorionic gonadotropin hcg negative human test potential childbearing pregnancy 
Cluster 858: menopausal sterilization bearing post child beta hcg potential surgical previous 
Cluster 982: chorionic hcg gonadotropin beta human pregnant women positive serum test 
Cluster 1025: hcg iu units sensitivity chorionic gonadotropin minimum test equivalent pregnancy 
Cluster 2355: beta pregnancy pregnant subject established hcg chorionic result confirmation gonadotropin