TY - JOUR

T1 - Do semiquantitative amniotic fluid indexes reflect actual volume?

AU - Croom, Christopher S.

AU - Banias, Bruce B.

AU - Ramos-Santos, Edgard

AU - Devoe, Lawrence D.

AU - Bezhadian, Ali

AU - Kinney Hiett, A.

PY - 1992/1/1

Y1 - 1992/1/1

N2 - OBJECTIVE: Our objective was to determine how well semiquantitative ultrasonographic measures ofamniotic fluid, i.e., maximal amniotic fluid vertical pocket and amniotic fluid index, reflect actual amniotic fluid volumes in 50 near-term patients whose amniotic fluid volume estimates were normal by visual inspection. STUDY DESIGN: Before amniocentesis for fetal lung maturity, each patient had visual amniotic fluidvolume estimates, maximal amniotic fluid vertical pocket, and amniotic fluid index performed by the same examiner, and then each received intraamniotic injection of a 10% paraaminohippurate solution. Amniotic fluid volume was quantitated by spectrophotometric assay of paraaminohippurate concentration. Oligohydramnios and polyhydramnios were defined as <300 and >2000 ml, respectively. RESULTS: Quantitative amniotic fluid volume was positively related to both amniotic fluid index andmaximal amniotic fluid vertical pocket (r = 0.75 and 0.60, respectively). True-positive rates for oligohydramnios (amniotic fluid index <5 cm or maximal amniotic fluid vertical pocket <2 cm) were 100% and 0%, respectively; false-positive rates with either method were 0%. True-positive rates for polyhydramnios (amniotic fluid index >20 cm and maximal amniotic fluid vertical pocket >8 cm) were 0%; false-positive rates were 16% and 24%, respectively. CONCLUSIONS: Amniotic fluid index appears to be slightly better than maximal amniotic fluid verticalpocket for reflecting actual amniotic fluid volume. Both indirect methods tend to overestimate actual amniotic fluid volume at the upper end of its extremes. (Am J Obstet Gynecol 1992;167:995–9.)

AB - OBJECTIVE: Our objective was to determine how well semiquantitative ultrasonographic measures ofamniotic fluid, i.e., maximal amniotic fluid vertical pocket and amniotic fluid index, reflect actual amniotic fluid volumes in 50 near-term patients whose amniotic fluid volume estimates were normal by visual inspection. STUDY DESIGN: Before amniocentesis for fetal lung maturity, each patient had visual amniotic fluidvolume estimates, maximal amniotic fluid vertical pocket, and amniotic fluid index performed by the same examiner, and then each received intraamniotic injection of a 10% paraaminohippurate solution. Amniotic fluid volume was quantitated by spectrophotometric assay of paraaminohippurate concentration. Oligohydramnios and polyhydramnios were defined as <300 and >2000 ml, respectively. RESULTS: Quantitative amniotic fluid volume was positively related to both amniotic fluid index andmaximal amniotic fluid vertical pocket (r = 0.75 and 0.60, respectively). True-positive rates for oligohydramnios (amniotic fluid index <5 cm or maximal amniotic fluid vertical pocket <2 cm) were 100% and 0%, respectively; false-positive rates with either method were 0%. True-positive rates for polyhydramnios (amniotic fluid index >20 cm and maximal amniotic fluid vertical pocket >8 cm) were 0%; false-positive rates were 16% and 24%, respectively. CONCLUSIONS: Amniotic fluid index appears to be slightly better than maximal amniotic fluid verticalpocket for reflecting actual amniotic fluid volume. Both indirect methods tend to overestimate actual amniotic fluid volume at the upper end of its extremes. (Am J Obstet Gynecol 1992;167:995–9.)

KW - Amniotic fluid volume

KW - amniotic fluid index

KW - amniotic fluid pocket

KW - ultrasonography

UR - http://www.scopus.com/inward/record.url?scp=0026644414&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0026644414&partnerID=8YFLogxK

U2 - 10.1016/S0002-9378(12)80026-3

DO - 10.1016/S0002-9378(12)80026-3

M3 - Article

C2 - 1415439

AN - SCOPUS:0026644414

VL - 167

SP - 995

EP - 999

JO - American Journal of Obstetrics and Gynecology

JF - American Journal of Obstetrics and Gynecology

SN - 0002-9378

IS - 4

ER -