| Anembryonic gestation | Ultrasonography shows gestational sac with mean diameter ≥ 25 mm and no yolk sac or embryo |
| Complete abortion | Complete passage of all products of conception |
| Early pregnancy loss | Nonviable intrauterine pregnancy within the first 12 6/7 weeks of gestation |
| Ectopic pregnancy | A pregnancy outside the uterine cavity (most commonly in a fallopian tube) |
| Embryonic demise | Ultrasonography shows embryo with crown-rump length ≥ 7 mm and no cardiac activity |
| Incomplete abortion | Some, but not all, of the products of conception have passed |
| Intrauterine pregnancy of uncertain viability | Transvaginal ultrasonography shows intrauterine gestational sac with no embryonic cardiac activity (and no findings of definite pregnancy failure [Table 2]) |
| Nonviable pregnancy | Pregnancy that cannot result in live birth (e.g., ectopic pregnancy, early pregnancy loss) |
| Pregnancy of unknown location | Positive urine or serum pregnancy test with no intrauterine or ectopic pregnancy shown on transvaginal ultrasonography |
| Recurrent pregnancy loss | More than two consecutive pregnancy losses |
| Spontaneous abortion | Spontaneous loss of pregnancy before 20 weeks' gestation |
| Threatened abortion | Bleeding before 20 weeks' gestation in the presence of an embryo with cardiac activity and a closed cervix |
| Viable pregnancy | Pregnancy that can potentially result in a live birth |
