| 单词 | chemical pregnancy | 
| 释义 | > as lemmaschemical pregnancy   chemical pregnancy  n. a pregnancy that ends in very early miscarriage and is detected only by a hormone test (typically a home or laboratory test for the presence of the hormone chorionic gonadotropin in the mother's blood or urine). ΚΠ 1982    Fertility & Sterility 38 156  				When chemical pregnancies were excluded, it was found that [embryo] transfers using open-end catheters were more successful. 2008    Observer 		(Nexis)	 30 Mar. 4  				They call it a chemical pregnancy, as if it existed only in a science laboratory and not in the hearts of the parents. 2014    G. Sher et al.  In Vitro Fertilization 243  				About 20% of early elevations in blood beta hCG levels following embryo transfer turn out to be chemical pregnancies that subsequently are lost. < as lemmas | 
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