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The tap test--an accurate first-line test for fetal lung maturity testing
W K H Kuchenbecker1, L R Pistorius, R C Pattinson
1Medical Research Council Maternal and Infant Health Care Strategies Research Unit, Department of Obstetrics and Gynaecology, Kalafong Hospital, Pretoria.
Summary
The simple tap test and laboratory optical density (OD) shift at 650 nm accurately predict the need for neonatal ventilation in high-risk pregnancies. These fetal lung maturity tests aid in clinical decision-making for delivery.
Area of Science:
- Obstetrics and Gynecology
- Neonatal Medicine
- Clinical Chemistry
Background:
- Accurate assessment of fetal lung maturity is crucial for high-risk pregnancies.
- Decisions regarding delivery are often based on fetal lung maturity testing.
- Predicting the need for neonatal ventilation is a key outcome measure.
Purpose of the Study:
- To evaluate the accuracy of various near-patient and laboratory fetal lung maturity tests.
- To determine which tests best predict the requirement for neonatal ventilation.
Main Methods:
- A prospective descriptive study involving 100 high-risk obstetric patients.
- Amniotic fluid analysis included visual examination, tap test, shake test, lecithin-sphingomyelin (L/S) ratio, phosphatidyl glycerol (PG) detection, and optical density (OD) at 650 nm.
- Neonates born within one week of amniocentesis were assessed for the need for ventilation.
Main Results:
- Twelve out of 100 neonates required ventilation.
- The tap test demonstrated high accuracy in predicting the need for neonatal ventilation.
- Laboratory-based optical density (OD) shift at 650 nm also showed significant predictive accuracy.
Conclusions:
- The tap test is a rapid, simple, and accurate bedside predictor of neonatal ventilation needs.
- The OD shift at 650 nm is the most accurate laboratory-based test for predicting neonatal ventilation in this setting.
- These findings support the use of specific fetal lung maturity tests to guide clinical management.