The effect of freezing amniotic fluid on lamellar body count fetal lung maturity testing

2017 ◽  
Vol 137 (2) ◽  
pp. 203-204
Author(s):  
Sarah Carroll ◽  
Craig V. Towers ◽  
Lynlee Wolfe ◽  
Lisa Duncan ◽  
Beth Weitz ◽  
...  
Keyword(s):  
Amniotic Fluid ◽  
Lamellar Body ◽  
Fetal Lung ◽  
Fetal Lung Maturity ◽  
Lung Maturity ◽  
Body Count

scholarly journals Comparative analysis of amniotic fluid lamellar body count and foam stability test as indices of fetal lung maturity

2010 ◽  
Vol 63 (11-12) ◽  
pp. 747-752 ◽  
Author(s):  
Jovana Visnjevac ◽  
Aleksandra Novakov-Mikic ◽  
Aleksandra Nikolic ◽  
Nemanja Visnjevac
Keyword(s):  
Respiratory Distress Syndrome ◽  
Respiratory Distress ◽  
Amniotic Fluid ◽  
Distress Syndrome ◽  
Lamellar Body ◽  
Fetal Lung ◽  
Receiver Operating Characteristic Curves ◽  
Fetal Lung Maturity ◽  
Lung Maturity ◽  
Body Count

Introduction. Respiratory distress syndrome of the newborn caused by the fetal lung immaturity is a very serious clinical problem. Different tests of prenatal analysis of amniotic fluid, such as lamellar body count and Clements? test, are available for predicting the fetal lung maturity. Material and methods. A prospective clinical study was conducted on amniotic fluid samples from 2005 to 2006. The amniotic fluid samples were obtained at the gestational age of 30 to 42 weeks and collected by vaginal amniotomy, amniotomy during Caesarean section and 72 hours before the delivery by amniocentesis. A haematology analyzer (Nikon-Kohden?) was used to determine the lamellar body counts. Clements? test involved adding an equal volume of 96% ethanol to the multiple amniotic fluid volume (1:2, 1:4, 1:16, 1:32), followed by shaking and noting the presence of ring of bubbles. After the delivery, we compared the lamellar body count results and Clements? test and the outcome of pregnancies, primarily the development of respiratory distress syndrome. The most specific lamellar body cutoffs for maturity and immaturity were determined according to receiver operating characteristic curves. Results and Discussion. Out of 232 amniotic fluid samples which were tested, 112 samples were collected after vaginal amniotomy, 88 during the Caesarean delivery and 32 samples by amniocentesis. The overall incidence of respiratory distress syndrome was 14.6%. Receiver operating characteristic curves were used to identify cutoff points for the test. We found that both tests are good screening tests for predicting the fetal lung maturity with the area under the curve of 0.782 in Clements? test and 0.751 in the lamellar body count. Clements? cutoff 2 with sensitivity of 67.6% and specificity of 72.2%, proved best in the prediction of the fetal lung maturity. The lamellar body count cutoff of 42x10?/?l had the sensitivity of 82.4% and specificity of 64.6% in predicting the fetal lung maturity. Conclusion. Although both tests are good in predicting the fetal lung maturity, the lamellar body count has more advantages, because it is not only more objective, but also inexpensive, easy and fast to do, requires a small sample volume and is universally available.

427: Blood contaminated amniotic fluid and the lamellar body count fetal lung maturity test

2013 ◽  
Vol 208 (1) ◽  
pp. S187
Author(s):  
Kevin Visconti ◽  
Craig Towers ◽  
Mark Hennessy ◽  
Bobby Howard ◽  
Stephanie Porter ◽  
...  
Keyword(s):  
Amniotic Fluid ◽  
Lamellar Body ◽  
Fetal Lung ◽  
Fetal Lung Maturity ◽  
Lung Maturity ◽  
Body Count

scholarly journals The ways of amniotic fluid sampling and its influence on lamellar body count

2010 ◽  
Vol 63 (7-8) ◽  
pp. 483-486 ◽  
Author(s):  
Jovana Visnjevac ◽  
Aleksandra Novakov-Mikic ◽  
Aleksandra Nikolic
Keyword(s):  
Amniotic Fluid ◽  
Lamellar Body ◽  
Fetal Lung ◽  
Sample Collection ◽  
Important Place ◽  
Fetal Lung Maturity ◽  
Artificial Surfactant ◽  
Insight Into ◽  
Lung Maturity ◽  
Body Count

Even though artificial surfactant is now available, respiratory distress syndrome still remains a serious problem in neonatology. Prenatal analysis of the amniotic fluid can provide data giving insight into the fetal lung maturity, which enables planning of the further outcome of high-risk pregnancies. Surfactant prevents atelectasis by forming a layer rich in phospholipids between the air and liquid phase in alveoli thus leading to increased surface tension in them, which is a precondition for a good lung function after birth. Lamellar bodies are a form of stored surfactant, and their count in the amniotic fluid can be determined simply by a standard hematology analyzer. The method of determining lamellar body count has found an important place in prenatal diagnostics and is recommended as an initial method of a ?cascade? procedure of testing fetal lung maturity. However, considering the importance of procedure of sample collection, storage and centrifugation, which can significantly affect the results obtained for the lung maturity, the amniotic fluid samples must be absolutely free of contamination with blood, meconium, mucus, bacteria and leucocytes.

scholarly journals Lamellar body count in amniotic fluid for assessing fetal lung maturity

2010 ◽  
Vol 63 (9-10) ◽  
pp. 595-600 ◽  
Author(s):  
Jovana Visnjevac ◽  
Aleksandra Novakov-Mikic ◽  
Aleksandra Nikolic ◽  
Nemanja Visnjevac
Keyword(s):  
Amniotic Fluid ◽  
Screening Test ◽  
Lamellar Body ◽  
Roc Curves ◽  
Fetal Lung ◽  
Prospective Clinical Study ◽  
Lamellar Bodies ◽  
Fetal Lung Maturity ◽  
Lung Maturity ◽  
Body Count

Introduction. Respiratory distress syndrome (RDS) of the newborn infant caused by immaturity of fetal lung is a very serious clinical problem. Surfactant is stored in the form of lamellar bodies. They are secreted into alveolar space and passed into amniotic fluid where they can be found. The similarity of lamellar body size to platelet size permits the use of a standard automated hematologic cell counter to estimate the number of lamellar bodies in amniotic fluid. Material and Methods. We conducted a prospective clinical study from 2005 - 2006 on amniotic fluid samples. Amniotic fluid samples were collected near delivery by transvaginal amniotomy, amniotomy during Cesarean section and 72 hours before delivery by amniocentesis. A hematology analyzer (Nikon - Kohden?) was used to determine the lamellar body counts. After birth of newborns we compared their complete clinical examination results particularly emphasizing the prediction of the method of RDS by lamellar body count. Maximally specific lamellar body cutoffs for maturity and immaturity were determined using ROC curves. Results and Discussion. Of 232 amniotic fluid samples which were tested, 112 samples were collected by transvaginal amniotomy, 88 were taken during Cesarean delivery and 32 samples were collected by amniocentesis. The incidence of RDS was 14.6%. ROC curves were used to identify cut points for the test. We found that LBC is a good screening test for predicting fetal lung maturity with the area under the curve of 0.751. LBC cutoff of 42x10?/?l, with sensitivity of 82.4% and specificity of 64.6%, proved best for predicting fetal lung maturity. Conclusion. LBC is a good screening test for predicting fetal lung maturity. The advantages of LBC are speed, objectivity, low price, low sample volume required and universal availability.

Amniotic fluid lamellar body count and its sensitivity and specificity in evaluating of fetal lung maturity

2005 ◽  
Vol 25 (3) ◽  
pp. 257-259 ◽  
Author(s):  
S Khazardoost ◽  
H Yahyazadeh ◽  
S Borna ◽  
F Sohrabvand ◽  
N Yahyazadeh ◽  
...  
Keyword(s):  
Amniotic Fluid ◽  
Sensitivity And Specificity ◽  
Lamellar Body ◽  
Fetal Lung ◽  
Fetal Lung Maturity ◽  
Lung Maturity ◽  
Body Count

scholarly journals Lamellar Body Count With Cell Dyn Emerald And Cell Dyn Ruby Methods On Preterm Birth

2017 ◽  
Vol 1 (1) ◽  
pp. 7
Author(s):  
Erlinda Widyastuti ◽  
Ario Imandiri
Keyword(s):  
Preterm Birth ◽  
Amniotic Fluid ◽  
Lamellar Body ◽  
Fetal Lung ◽  
Impedance Method ◽  
Lamellar Bodies ◽  
Cross Sectional ◽  
Fetal Lung Maturity ◽  
Lung Maturity ◽  
Body Count

Background: Lamellar bodies are produced by pneumocyte type II cells in the lung alveoli. Lamellar bodies are present in amniotic fluid in increasing quantities as gestation advances, 1 – 5 µm in size, similar in size to small platelets and can be counted on most electronic cell counters in hematology analyzer. Lamellar body count is useful for prediction of fetal lung maturity and neonatal respiratory distress syndrome. The current gold standard for determination of fetal lung maturity is the evaluation of phospholipids in amniotic fluid samples by thin-layer chromatography, but it is time-consuming and not continuously available at most institutions. In this study we compare Cell Dyn Emerald and Cell Dyn Ruby method, which is expected to be a review for lamellar body count method. Purpose:  The aim of this study was to analyze lamellar body count with Cell Dyn Emerald and Cell Dyn Ruby method on preterm birth. Methods : This was a cross sectional study. Thirty three samples study were inpatient’s amniotic fluid with premature rupture of membranes in Obstetry and Gynecology ward emergency room Dr. Soetomo Hospital Surabaya. Lamellar body count was counted with Cell Dyn emerald and Cell Dyn Ruby method. The statistical differences were assessed using the ANOVA test . Results : The results showed significant differences (t=49,04), lamellar body count with Cell Dyn Ruby method was much lower than Cell  Dyn Emerald method. The lowest result with Cell Dyn Ruby method was 3.38 x 103/µL and 17 x 103/ µL with Cell Dyn Emerald method. The highest results with Cell Dyn Ruby method was 98,2 x 103/ µL and 221 x 103/ µL with Cell Dyn Emerald method. Conclusion : Lamellar body count with impedance method (Cell Dyn Emerald) is significantly higher than optic method (Cell Dyn Ruby).

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