体外受精/卵胞质内单精子显微注射双卵双胎减胎后妊娠结局的病例对照研究

目的探讨双卵双胎妊娠早期减胎为单胎的妊娠结局。方法 2008年1月—2014年12月期间体外受精及卵胞质内单精子注射-胚胎移植(IVF/ICSI-ET)后双胎妊娠早期(孕45~75 d)减胎为单胎者102例(A组),三胎妊娠早期减胎为双胎者73例(B组)以及双胎妊娠未减胎者4 638例(C组),比较其中晚期流产率、早产率等进一步的妊娠结局。结果 IVF/ICSI-ET后A组与B组和C组比较,早产率(10.8%,58.6%,42.1%)、低出生体质量儿率(6.8%,44.1%,30.3%)明显降低,孕周[(38.0±2.0)周,(35.7±2.3)周,(36.4±2.1)周]、出生体质量[(3.17±0.53)kg,(2.51±0.59)kg,(2.69±0.53)kg]明显增加,差异有统计学意义(P0.05),中晚期流产率差异无统计学意义(P0.05)。结论 IVF/ICSI后的双卵双胎妊娠,于孕早期行减胎术安全,具有更好的妊娠结局。     

氧浓度对体外培养胚胎发育的影响

目的:探讨体外受精/卵胞质内单精子注射(IVF/ICSI)后移植前胚胎在不同氧浓度培养条件下的发育情况。方法:将接受IVF或ICSI的患者随机分组成常氧组(体积分数20%的氧浓度,包括IVF卵裂期胚胎患者150例,IVF囊胚期胚胎患者51例,ICSI卵裂期胚胎患者81例,ICSI囊胚期胚胎患者39例)和低氧组(体积分数5%的氧浓度,包括IVF卵裂期胚胎患者108例,IVF囊胚期胚胎患者56例,ICSI卵裂期胚胎患者79例,ICSI囊胚期胚胎患者45例),观察各组胚胎在受精后第3日的卵裂胚和第5日的囊胚发育情况以及临床妊娠结局。结果:在患者年龄、不孕年限、基础FSH值、Gn用量、获卵数和MⅡ卵率组间均无统计学差异的基础上,1与常氧组相比,低氧组的胚胎IVF或ICSI后的受精率、卵裂率以及第3日形成的优质胚胎率无统计学差异(P0.05),临床妊娠率和着床率组间也无统计学差异(P0.05);2低氧组胚胎IVF或ICSI后形成的Ⅴ级囊胚多于常氧组(P0.05),总囊胚形成率组间有显著的统计学差异(P0.01),临床妊娠率和着床率组间无统计学差异(P0.05)。结论:与常氧培养条件相比,低氧培养条件并不能显著促进IVF/ICSI后卵裂期胚胎的发育,但能够促进囊胚的形成,特别是囊胚的孵出,因此低氧培养可以作为囊胚培养的首选条件,但不是卵裂期胚胎培养的必要条件。     

体外受精-胚胎移植后早期妊娠丢失的相关风险因素分析

目的：分析体外受精-胚胎移植（IVF-ET）后早期自然妊娠丢失及其相关因素。方法：收集2001年5月—2007年12月在中山大学孙逸仙纪念医院生殖中心行IVF-ET治疗获得妊娠的患者547例,根据其妊娠12周时情况分为妊娠丢失组和妊娠持续组,回顾性比较分析2组患者中女方的一般情况、不孕病因;男方的精液检查情况、精子来源和助孕过程。结果：本中心新鲜IVF/胞浆内单精子注射（ICSI）-ET周期的早期妊娠丢失率为26.87%,临床流产率为16.45%。547例患者中女方年龄≥37岁患者的早期妊娠丢失率为46.7%,显著高于≤30岁的患者（27.2%）及30～37岁的患者（21.7%,均P〈0.05）;单孕囊组妊娠丢失率为35.0%,显著高于多孕囊组的10.9%（P〈0.001）。多因素Logistic回归分析显示辅助生殖治疗后早期妊娠丢失相关风险因素依次为：多囊卵巢综合征（PCOS）排卵障碍（OR=7.025,95%CI为2.426～20.341）、女方年龄（OR=1.080,95%CI为1.006～1.160）、孕囊数（OR=0.042,95%CI为0.022～0.081）、人绒毛膜促性腺激素（hCG）注射日子宫内膜厚度（OR=0.904,95%CI为0.808～1.012）。结论：新鲜IVF/ICSI-ET周期的早期妊娠丢失率与自然妊娠流产率相似,早期妊娠丢失与PCOS患者的排卵障碍、女方年龄、着床孕囊数相关,高危患者在进行辅助生殖治疗前应积极治疗,尽早采取安胎措施减少妊娠丢失。     

体外受精-胚胎移植后早期妊娠丢失的相关风险因素分析

目的：分析体外受精-胚胎移植（IVF-ET）后早期自然妊娠丢失及其相关因素。方法：收集2001年5月—2007年12月在中山大学孙逸仙纪念医院生殖中心行IVF-ET治疗获得妊娠的患者547例,根据其妊娠12周时情况分为妊娠丢失组和妊娠持续组,回顾性比较分析2组患者中女方的一般情况、不孕病因;男方的精液检查情况、精子来源和助孕过程。结果：本中心新鲜IVF/胞浆内单精子注射（ICSI）-ET周期的早期妊娠丢失率为26.87%,临床流产率为16.45%。547例患者中女方年龄≥37岁患者的早期妊娠丢失率为46.7%,显著高于≤30岁的患者（27.2%）及30～37岁的患者（21.7%,均P＜0.05）;单孕囊组妊娠丢失率为35.0%,显著高于多孕囊组的10.9%（P＜0.001）。多因素Logistic回归分析显示辅助生殖治疗后早期妊娠丢失相关风险因素依次为：多囊卵巢综合征（PCOS）排卵障碍（OR=7.025,95%CI为2.426～20.341）、女方年龄（OR=1.080,95%CI为1.006～1.160）、孕囊数（OR=0.042,95%CI为0.022～0.081）、人绒毛膜促性腺激素（hCG）注射日子宫内膜厚度（OR=0.904,95%CI为0.808～1.012）。结论：新鲜IVF/ICSI-ET周期的早期妊娠丢失率与自然妊娠流产率相似,早期妊娠丢失与PCOS患者的排卵障碍、女方年龄、着床孕囊数相关,高危患者在进行辅助生殖治疗前应积极治疗,尽早采取安胎措施减少妊娠丢失。     

体外受精-胚胎移植与单精子卵胞浆内注射妊娠结局的比较与分析

目的　探讨体外受精 胚胎移植 (IVF ET)和单精子卵胞浆内注射 (ICSI)的妊娠结局及围产儿结局。方法　回顾性分析 1999年 1月至 2 0 0 1年 6月 ,行IVF ET获得妊娠的 14 3例 (IVF ET组 )及行ICSI获得妊娠的 173例 (ICSI组 )的临床资料 ,比较两组的生化妊娠、流产、异位妊娠、多胎分娩发生率及新生儿出生体重、胎儿孕龄、先天性畸形、围产儿死亡率的情况 ;并对两组单胎、双胎妊娠的结局分别进行比较。结果　IVF ET组与ICSI组两组患者的年龄、不孕年限、产次、移植胚胎数、流产率 (16 1%、13 3% )、分娩率 (6 5 7%、74 6 % )、多胎分娩发生率 (2 7 3%、31 8% )比较 ,差异均无显著性 (P >0 0 5 )。单胎妊娠中 ,IVF ET组与ICSI组低体重儿的发生率分别为 1 8%、6 8% ,小于胎龄儿的发生率分别为 7 3%、8 1% ,早产的发生率分别为 5 5 %、14 9% ;双胎妊娠中 ,IVF ET组与ICSI组低体重儿的发生率分别为 34 2 %、4 2 6 % ,小于胎龄儿的发生率分别为 30 3%、38 0 % ,早产的发生率分别为 4 2 1%、4 6 3%。两组间上述各发生率比较 ,差异均无显著性 (P >0 0 5 )。但双胎妊娠中 ,上述各发生率均明显高于单胎妊娠。两者比较 ,差异均有极显著性 (P <0 0 1)。先天性畸形的发生率 ,IVF ET组与ICSI组分别为 2 2 %     

移植胚胎数和着床胚胎数与妊娠早期血清β-hCG值的关系

目的:探讨移植胚胎数和着床胚胎数与妊娠早期血清β-hCG值的关系。方法:回顾性分析IVF/ICSI新鲜胚胎移植后820个宫内妊娠周期,根据移植胚胎数及移植后35 d B超显示的妊娠囊数分组,比较移植14 d、18 d血清β-hCG水平及其上升幅度。结果:不同移植胚胎数相同妊娠囊数组间比较血清β-hCG差异无统计学意义(P>0.05);妊娠早期血清β-hCG水平:三妊娠囊组>双妊娠囊组>单妊娠囊组,差异有统计学意义(P<0.05);血清β-hCG上升幅度各组比较无统计学意义(P>0.05)。结论:移植胚胎数对妊娠早期血清β-hCG无直接影响;着床胚胎数影响妊娠早期血清β-hCG水平。妊娠囊越多,其hCG水平就越高。     

采用新鲜和冻融精子进行卵母细胞胞质内单精子注射的临床效果比较

目的 比较采用新鲜和冻融的睾丸及附睾精子进行卵母细胞胞质内单精子注射(ICSI)的临床效果.方法 选择2006年9月-2007年5月因无精症于北京大学第三医院生殖医学中心行ICSI的患者208例,按患者意愿分为冻融组37例和新鲜组171例.冻融组在行ICSI前将冻存的睾丸或附睾精子解冻并复苏.观察冻融组睾丸和附睾精子的临床利用率;比较两组患者的临床结局(包括正常受精率、优质胚胎率、临床妊娠率及胚胎着床率等)和妊娠结局(包括流产率、分娩孕周及新生儿出生体重等).结果 (1)冻融组睾丸精子的临床利用率为92%(23/25),附睾精子为100%(12/12).(2)新鲜组患者的正常受精率、优质胚胎率、临床妊娠率及胚胎着床率分别为62.25%(973/1563)、78.9%(768/973)、44.4%(60/135)和29.3%(84/287),分别与冻融组[分别为64.53%(282/437)、79.1%(223/282)、46.9%(15/32)和33.3%(23/69)]比较,差异均无统计学意义(P＞0.05).(3)新鲜组患者的流产率、单胎妊娠分娩孕周、双胎妊娠分娩孕周、单胎妊娠平均新生儿出生体重及双胎妊娠平均新生儿出生体重分别为11%(6/55)、(39.0±1.4)周、(36.8±1.7)周、(3409±393)g和(2584±266)g,分别与冻融组[分别为7%(1/15)、(38.7±0.6)周、(36.3±1.2)周、(3350±383)g和(2635±171)g]比较,差异均无统计学意义(P＞0.05).结论 采用冻融的睾丸或附睾精子行ICSI安全、有效,值得在临床推广.     

脱氢表雄酮(DHEA)预治疗在体外受精-胚胎移植周期中的应用

目的:探讨脱氢表雄酮(DHEA)预治疗在卵巢储备低下妇女的体外受精/卵胞质内单精子注射-胚胎移植(IVF/ICSI-ET)周期治疗中的作用。方法:对173例卵巢储备功能低下进行IVF/ICSI-ET的患者进行随机对照研究。DHEA预治疗组(n=81)患者口服DHEA,连用3个月,对照组为未服用DHEA预治疗者(n=92)。观察患者的一般情况、超促排卵情况及胚胎发育和妊娠结局。结果:患者一般情况、hCG注射日子宫内膜厚度及E2水平、Gn使用量和Gn使用天数组间均无统计学差异(P>0.05)。DHEA组IVF受精率、优质胚胎率及临床妊娠率均高于对照组(P<0.05)。但在胚胎种植率、早期流产率、周期取消率组间差异无统计学意义(P>0.05)。结论:DHEA预治疗可以改善卵巢储备功能低下妇女的IVF结局。     

重度卵巢过度刺激综合征38例晚期妊娠结局分析

目的:探讨重度卵巢过度刺激综合征(OHSS)患者的晚期妊娠结局。方法:回顾分析我院行体外受精-胚胎移植(IVF-ET)而发生重度OHSS的晚期妊娠患者的临床资料,与同期未发生OHSS的IVF晚期妊娠患者的妊娠结局比较。结果:38例重度OHSS患者中单胎18例、双胎20例;IVF组232例中相应为119例、113例。OHSS组单胎早产率为5.56%、双胎早产率45%,IVF组相应为5.04%、43.36%。OHSS组与IVF组的单胎与双胎分娩比率、早产比率差异均无统计学意义(P>0.05)。OHSS组单胎妊娠期糖尿病(GDM)发病率为5.56%,双胎为5%;IVF组分别为5.04%、5.31%。OHSS组单胎妊娠期高血压疾病(PIH)发病率为11.11%,双胎为10%;IVF组分别为9.24%、9.73%。OHSS组GDM及PIH的发生率与IVF组比较,差异无统计学意义(P>0.05)。结论:重度OHSS的发生未对晚期妊娠结局产生明显不良影响。     

血脂水平与体外受精周期胚胎质量的相关性初步研究

目的:研究不孕症患者血脂水平与体外受精(IVF/ICSI)胚胎质量的相关性。方法:对行IVF/ICSI治疗、符合纳入标准的646例不孕症患者的资料进行回顾性分析,测定、分析血清三酰甘油(TG)、总胆固醇(TC)、高密度脂蛋白(HDL)、非高密度脂蛋白(nonHDL)、低密度脂蛋白(LDL)和脂蛋白(a)[LP(a)]水平与胚胎质量的关系。血脂水平和IVF/ICSI胚胎质量相关性采用Spearman相关分析。结果:患者年龄、体质量指数(BMI)、基础FSH、窦卵泡数、Gn用量及血脂水平临床妊娠组和非临床妊娠组之间均无统计学差异;受精率、卵裂数、优质胚胎数和优质胚胎率临床妊娠组均显著高于未临床妊娠组(P<0.05)。血脂水平和IVF/ICSI胚胎质量相关分析显示:TG和TC与卵子数、受精数及卵裂数均显著负相关,TC、LDL及nonHDL与优质胚胎数呈显著负相关(P<0.05),其余均无统计学意义。结论:血脂水平临床妊娠组与未临床妊娠组间均无统计学差异;IVF/ICSI胚胎质量与TC、LDL及nonHDL呈显著负相关。     

The quality and size of yolk sac in early pregnancy loss

BACKGROUND: Accurate differentiation between normal pregnancy and pregnancy loss in early gestation remains a clinical challenge. AIMS: To determine whether ultrasound findings of yolk sac size and morphology are valuable in relation to pregnancy loss at six to ten weeks gestation. METHODS: Transvaginal ultrasonography was performed in 111 normal singleton pregnancies, 25 anembryonic gestations, and 18 missed abortions. Mean diameters of gestational sac and yolk sac were measured. The relationship between yolk sacs and gestational sacs in normal pregnancies was depicted. The yolk sacs ultrasound findings in cases of pregnancy loss were recorded. RESULTS: In normal pregnancies with embryonic heartbeats, a deformed or an absent yolk sac was never detected. Sequential appearance of yolk sac, embryonic heartbeats and amniotic membrane was essential for normal pregnancy. The largest yolk sac in viable pregnancies was 8.1 mm. Findings in anembryonic gestations included an absent yolk sac, an irregular-shaped yolk sac and a relatively large yolk sac (> 95% upper confidence limits, in 11 cases). In cases of missed abortion with prior existing embryonic heartbeats, abnormal findings included a relatively large, a progressively regressing, a relatively small, and a deformed yolk sac (an irregular-shaped yolk sac, an echogenic spot, or a band). CONCLUSION: A very large yolk sac may exist in normal pregnancy. When embryonic heartbeats exist, the poor quality and early regression of a yolk sac are more specific than the large size of a yolk sac in predicting pregnancy loss. When an embryo is undetectable, a relatively large yolk sac, even of normal shape, may be an indicator of miscarriage.     

Pregnancy outcome of early multifetal pregnancy reduction: triplets to twins versus triplets to singletons

Multifetal pregnancy reduction (MPR) of triplets to twins results in improved pregnancy outcomes compared with triplet gestations managed expectantly. Perinatal outcomes of early transvaginal MPR from triplets to twins were compared with reduction from triplets to singletons. Seventy-four trichorionic triplet pregnancies that underwent early transvaginal MPR at 6–8 weeks gestation were included. Cases were divided into two groups according to the initial procedure: reduction to twin (n = 55) or to singleton (n = 19) gestations. Infants from triplet pregnancies reduced to twins were delivered earlier (36.6 versus 37.9 weeks; P = 0.04) and had lower mean birth weights (2364 g versus 2748 g; P = 0.02) compared with those from triplets reduced to singleton gestations. The rates of pregnancy loss before 24 weeks (3.6% versus 5.3%), as well as of preterm delivery before 32 and 34 weeks of gestation (0% versus 5.3% and 7.3% versus 5.3%, respectively) were similar between the twin and singleton pregnancies. No significant difference was found in the prevalence of gestational diabetes (15.1% versus 5.6%) or gestational hypertension (24.5% versus 16.7%) between the groups. Selective reduction of triplet pregnancies to singleton rather than twin gestations is associated with improved outcomes.     

Gestation sac size in in-vitro fertilization pregnancies

The gestation sac size in pregnancies resulting from in-vitro fertilization (IVF) and embryo transfer have been compared with those in spontaneous pregnancies. Small-for-dates gestational sac sizes were found in 36% of the IVF pregnancies. This proportion held for both singleton and multiple pregnancies. With increasing gestation beyond 8 weeks the gestation sac volume increasingly approached normal. In contrast to spontaneous conceptions, IVF pregnancies had a low rate of pregnancy loss once fetal heart movements were demonstrated, when the gestation sac size was small-for-dates. Small sac size in an IVF pregnancy may lead to the misdiagnosis of a failed pregnancy.     

Gestation sac size in in-vitro fertilization pregnancies

Summary. The gestation sac size in pregnancies resulting from in-vitro fertilization (IVF) and embryo transfer have been compared with those in spontaneous pregnancies. Small-for-dates gestational sac sizes were found in 36% of the IVF pregnancies. This proportion held for both singleton and multiple pregnancies. With increasing gestation beyond 8 weeks the gestation sac volume increasingly approached normal. In contrast to spontaneous conceptions, IVF pregnancies had a low rate of pregnancy loss once fetal heart movements were demonstrated, when the gestation sac size was small-for-dates. Small sac size in an IVF pregnancy may lead to the misdiagnosis of a failed pregnancy.     

Reduction of twin pregnancy to singleton: does it improve pregnancy outcome?

Objective.?To compare pregnancy complications, obstetrical and neonatal outcome of twin pregnancies reduced to singleton, with both non-reduced twin pregnancies and singleton pregnancies.

Methods.?A retrospective case–control study was performed at the Obstetrics and Gynecology Ultrasound unit of a tertiary referral medical center. Patient's population included 32 bi-chorionic bi-amniotic twin pregnancies reduced to singleton and 35 non-reduced twin pregnancies. Thirty-six patients with singleton pregnancies comprised the second control group. Main outcome measures were rates of pregnancy complications, preterm delivery (both before 37 weeks of gestation and before 34 weeks of gestation), late abortions, intra-uterine growth retardation, cesarean section, mean birth weights, and mean gestational age at delivery.

Results.?The reduced twin pregnancies group had similar rates of total pregnancy complications, preterm deliveries, and cesarean section as non-reduced twins. Gestational age at delivery and mean birth weight were also similar to non-reduced twins and significantly different compared with singletons. Preterm delivery and late abortion incidences were significantly higher when reduction was beyond 15 weeks gestation.

Conclusions.?Reduction of twin pregnancy to singleton does not change significantly pregnancy course and outcome. Favorable obstetrical and neonatal outcomes could be achieved by performing early, first trimester reductions.     

Assessment of the predictive value of serum progesterone levels on early pregnancy prognosis in spontaneous twin gestations: a prospective study

OBJECTIVES: The aim of this study was to assess the predictive value of serum progesterone levels in early pregnancy prognosis in spontaneous dichorionic-diamniotic twin gestations. STUDY DESIGN: This study was carried out among 38 spontaneous dichorionic-diamniotic twin gestations between January 2003 and June 2005 in the Department of Obstetrics and Gynaecology at the Gulhane Military Medical Academy. Serum progesterone levels were measured at 7 and 10 weeks' gestation and pregnancies were followed until 14 gestational weeks by ultrasound examination. RESULTS: We found that a progesterone level of 58 nmol/l in the 7th gestational week and of 51 ng/ml at 10 gestational weeks has a predictive value for viable intrauterine twin pregnancies with 83% sensitivity and 69% specificity and 83% sensitivity and 84% specificity, respectively. CONCLUSION: Progesterone levels in the early gestational weeks may be a biochemical marker for the prediction of a twin pregnancy outcome and may reduce the number of ultrasound examinations.     

Is severe OHSS associated with adverse pregnancy outcomes? Evidence from a case–control study

Ovarian hyperstimulation syndrome (OHSS) is a serious and potentially life-threatening complication of fertility treatment. This study evaluated pregnancy outcomes of women hospitalized for severe OHSS. A case–control study was performed of 125 women who were hospitalized due to severe OHSS compared with a control group, consisting of 156 women matched by age and aetiology of infertility, who conceived via IVF and did not develop OHSS. Among women with singleton pregnancies, patients with severe OHSS delivered significantly earlier (37.96 versus 39.11 weeks) and had smaller babies (2854 g versus 3142 g) compared with the matched controls. Similarly, rates of preterm delivery (<34 weeks of gestation: 8.9% versus 0%, P < 0.01; <37 weeks of gestation: 20.5% versus 5.1%, P < 0.01) were significantly increased among patients in the study group. There were no between-group differences in the rates of gestational diabetes, gestational hypertension and intrauterine growth restriction. In contrast, twin pregnancies following OHSS were not significantly different from matched control twins, with regard to the rates of delivery <34 weeks and <37 weeks of gestation, gestational diabetes, gestational hypertension and intrauterine growth restriction. In conclusion, severe OHSS at early gestation is associated with adverse pregnancy outcome only in singleton gestations.     

Obstetric outcome after fetal reduction to singleton pregnancies

OBJECTIVE: To study the outcome after fetal reduction or selective termination to singleton pregnancies for various indications. METHODS: Fetal reduction or selective feticide to singleton pregnancies was performed in 80 multiple gestations (congenital malformations, 17 cases; high-risk obstetric conditions, 25 cases; or social/psychological indications, 38 cases). RESULTS: The overall pregnancy loss rate was 10%; however, pregnancy failure was significantly higher in selective reductions performed for preterm prelabor rupture of membranes (PPROM) (4/8) compared with monochorionic twin and bad obstetric history. Fetal reduction to singletons for psychological reasons resulted in a pregnancy wastage of 5.3% (2/38). Procedures performed at < or =14 weeks showed a significantly lower fetal loss rate (2/61; 3.3%), a higher mean gestational age at delivery (38.3+/-2.2 weeks), and a decreased prematurity rate (p< or =0.001). The number of reduced fetuses, prenatal diagnosis by chorionic villus sampling before the reduction and maternal age did not interfere with pregnancy outcome. CONCLUSION: Fetal reduction to singleton pregnancies has a favorable outcome, especially when performed before 14 weeks of gestation.     

Spontaneous fetal reduction in multiple gestations assessed by transvaginal ultrasound.

OBJECTIVE: To assess the occurrence of disappearance of one or more of the fetuses in pregnancies which start as multiple gestation. DESIGN: Observational study. SETTING: Infertility section, Rambam Hospital, Haifa. SUBJECTS: 88 women with multiple gestations, established after ovulation induction (54 twin, 26 triplet, five quadruplet, and three quintuplet) and diagnosed by transvaginal ultrasound at 5-6 weeks, in all of whom absorption of at least one gestation sac was detected at follow-up ultrasound scan. INTERVENTIONS: Follow-up by serial transvaginal and later abdominal ultrasound scan throughout pregnancy. RESULTS: Of the 54 twin gestations, 51 ended in the birth of a singleton and three in miscarriage. Of the 26 pregnancies starting as triplets, 12 ended in singleton births, 12 in twins and two miscarried. The five quadruplet gestations resulted in one singleton birth, one set of twins, two triplets, and one ended in late miscarriage. Of the three quintuplet pregnancies, two resulted in the birth of triplets, one of them after spontaneous, the other after iatrogenic fetal reduction. In the third quintuplet pregnancy, one fetus vanished spontaneously and another was subject to iatrogenic reduction, two fetuses survived and were liveborn. Of the 221 fetuses identified 107 (48%) vanished spontaneously. CONCLUSION: Iatrogenic fetal reduction should be delayed until 12 weeks gestation in quadruplet or higher multiple gestations, but is probably not indicated in twin and triplet gestations.     

The amniotic fluid index in normal twin pregnancies

OBJECTIVE: We sought to investigate the amniotic fluid index for individual gestational sacs of twin pregnancies. STUDY DESIGN: Four hundred eighty-eight patients with normal diamniotic twins were examined between 14 and 40 weeks' gestation. The dividing membrane between twin fetuses was identified. An amniotic fluid index was then obtained for each gestational sac. RESULTS: The median amniotic fluid index in individual twin gestational sacs rises slowly from 14 to 16 weeks' gestation to 23 to 28 weeks' gestation and then gradually declines. The median amniotic fluid index values by gestational age for twin A and twin B are not statistically different. Although twin pregnancies have a slightly lower median amniotic fluid index value than singleton pregnancies, the difference is also not statistically significant. CONCLUSION: Individual amniotic fluid indices can be obtained in twin pregnancies, and the values are comparable with those of singleton gestations.