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生物学的和免疫学的妊娠试验须在末次月经6周后,当每升含有500～1500国际单位绒毛膜促性腺激素(hCG)时,方能测出妊娠,正确性为95％。很大部分孕6周前的早期正常妊娠,先兆和过期流产、50％的宫外孕和滋养细胞肿瘤,当每毫升hCG水平低于500毫国际单位时则测不出。用放射免疫测定(RIA)能在每升含6国际单位时测出。Vaitukaitis等用hCG的β亚单位制成血清作放射免疫测定,避免hCG同黄体生成素(LH)的交叉反应。RIA需温育48～72小时,能更精确地测定,可作为研究工具,但不能快速检查普遍应用。放射受体测定(RRA)为以牝牛黄体的血浆膜
Biologic and immunological pregnancy tests require pregnancy at 95% accuracy at 6-15 weeks after the last menstrual period with 500-1500 IU per hour of human chorionic gonadotropin (hCG). Most early gestational pregnancies, threatened and late abortions, and 50% of ectopic pregnancy and trophoblastic tumors 6 weeks prior to pregnancy are undetectable when the hCG level is below 500 milliauters per milliliter. Radioimmunoassay (RIA) can be measured at 6 international units per liter. Vaitukaitis and other β-subunit of hCG made serum for radioimmunoassay, to avoid hCG with the luteinizing hormone (LH) cross-reaction. RIA need to be incubated 48 to 72 hours, can be more accurately measured, can be used as a research tool, but can not quickly check the universal application. Radioimmunoassay (RRA) is a plasma membrane of goat bullose corpus