Validity of the third trimester ultrasound screening at 36 weeks compared to 32 weeks gestational foetus in the detection of small for gestational age

A randomised controlled clinical trial on the validity of the third trimester ultrasound screening at 36 weeks compared to 32 weeks gestational foetus in the detection of small for gestational age

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN17997330

Enrollment

2600

Registered

2011-12-05

Start date

2011-05-01

Completion date

Unknown

Last updated

2015-01-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Small foetuses for gestational age and intrauterine growth restriction Pregnancy and Childbirth Small for gestational age

Interventions

1. The third trimester ultrasound screening was carried out using randomisation. In the control group of pregnant women to take during the week 32 and in the case group during week 36, where static va

Eligibility

Sex/Gender

Female

Inclusion criteria

Inclusion criteria: 1. Age greater than or equal to 18 years 2. Gestation of single foetus 3. Gestation length cranes flow dated by LCC or the first quarter 3.1. No foetal malformations detected in the first or second quarter 3.2. Absence of pregestational diabetes, renal or autoimmune diseases, chronic hypertension 4. Sign the informed consent of the study

Exclusion criteria

Exclusion criteria: 1. Have participated in a clinical research study during the last 3 months 2. Inability to sign informed consent or do not want to do it

Design outcomes

Primary

Measure	Time frame
1. Measurements of biparietal diameter (BPD), were obtained from a transverse axial plane of the foetal head showing a central mid-line echo broken in the anterior third by the cavum septii pellucidi and demonstrating the anterior and posterior horns of the lateral ventricles. BPD was measured from the outer borders of the skull. The hemisphere was measured from the mid-line to the inner border of the skull. 2. Chest circumference (CC) was measured in the same axial plane, outside the bone 3. The femur length (FL) was measured from the greater trochanter to the lateral condyle 4. For abdominal circumference (AC), a transverse section of the fetal abdomen was taken at the level of the stomach and the bifurcation of the main portal vein into its right and left branches All the measurements were performed on two occasions, and avaerage was calculated. The same measurements were perfomed in the group of 32 weeks, and in the group of 36 weeks, similar.	—

Measure

Time frame

1. Measurements of biparietal diameter (BPD), were obtained from a transverse axial plane of the foetal head showing a central mid-line echo broken in the anterior third by the cavum septii pellucidi and demonstrating the anterior and posterior horns of the lateral ventricles. BPD was measured from the outer borders of the skull. The hemisphere was measured from the mid-line to the inner border of the skull. 2. Chest circumference (CC) was measured in the same axial plane, outside the bone 3. The femur length (FL) was measured from the greater trochanter to the lateral condyle 4. For abdominal circumference (AC), a transverse section of the fetal abdomen was taken at the level of the stomach and the bifurcation of the main portal vein into its right and left branches All the measurements were performed on two occasions, and avaerage was calculated. The same measurements were perfomed in the group of 32 weeks, and in the group of 36 weeks, similar.

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Secondary

Measure	Time frame
1. The calculation of foetal weight is estimated using the formula of Hadlock 14. Formula BPD, PC, PA, LF. MA (age mesntrual) = 10.85 + 0.060 (PC) (LF) + 0.6700 (BPD) + 0.1680 (BP). With standart deviation of 1.02 and a maximum error of 3.2 weeks 2. The limitation of the percentile will follow the following outline or calculate the difference between the percentile of the week in particular and the upper (PE week 33 between the 20th percentile, 10th percentile and 34th the difference is 10), divide by the difference between 7 days in the week (10 / 7 = 1.4) and so will the change in percentile day. Apply the difference Percentile day (PE at 33, three would be 1.4 x 3 = 4.2 and therefore would be 20 to 4.2 = 15, 8) The ultrasound used are: 2.1. Voluson 730 Expert. 2.2. Acuson Antares. Siemens. 2.3. Toshiba 20 Nemi	—

Measure

Time frame

1. The calculation of foetal weight is estimated using the formula of Hadlock 14. Formula BPD, PC, PA, LF. MA (age mesntrual) = 10.85 + 0.060 (PC) (LF) + 0.6700 (BPD) + 0.1680 (BP). With standart deviation of 1.02 and a maximum error of 3.2 weeks 2. The limitation of the percentile will follow the following outline or calculate the difference between the percentile of the week in particular and the upper (PE week 33 between the 20th percentile, 10th percentile and 34th the difference is 10), divide by the difference between 7 days in the week (10 / 7 = 1.4) and so will the change in percentile day. Apply the difference Percentile day (PE at 33, three would be 1.4 x 3 = 4.2 and therefore would be 20 to 4.2 = 15, 8) The ultrasound used are: 2.1. Voluson 730 Expert. 2.2. Acuson Antares. Siemens. 2.3. Toshiba 20 Nemi

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Countries

Spain

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Feb 4, 2026