Kleihauer-Betke testThe nurse should expect the provider to prescribe a Kleihauer-Betke test for a client who has suspected placental abruption to determine if fetal blood is in maternal circulation. This test is useful to determine if Rho-(D) immune globulin therapy should be administered to a client who is Rh-negative.A progesterone serum level helps to determine if a client is pregnant and if the pregnancy is ectopic.Lecithin/sphingomyelin (L/S) ratio is done as a part of an amniocentesis to evaluate fetal lung maturity.Maternal Alpha-fetoprotein (AFP) is a laboratory test used to assess for neural tube defects or chromosome disorders.