Bmus dating charts

Bmus dating charts

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Fetal Measurements

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You can change your ad preferences anytime. Fetal biometry. Upcoming SlideShare. Like this presentation? Why not share! Embed Size px. Start on. Show related SlideShares at end. WordPress Shortcode. Published in: Full Name Comment goes here. Are you sure you want to Yes No. Mamta Pandey. Bora Hong. Anis Afikah Ismail. Myriam Mbakop. Show More. No Downloads. Views Total views. Actions Shares. Embeds 0 No embeds. No notes for slide. Fetal biometry 1.

Fetal Biometry - is the measurement of parameters to assess gestational age and growth Dating: Why date Pregnancies? Other measurements can be taken, these include humerus same as femur — useful in some types of Dwarfism , transverse cerebellar diameter, foot, orbits, mandible etc. Ultrasound is used to assess changes in fetal head and body size, with increasing gestational age to allow detection of abnormal growth patterns.

FetalFetal BiometryBiometry Why assess growth? Which measurements? Measurement technique: Circumference measurements can be either plotted traced , using callipers to trace around the circumference or Derived. Angle so that the beam is along the transverse plane through the fetal head. Check for symmetry of the head and FetalFetal BiometryBiometry ensure the shape appears oval. Midline falx, broken by cavum septum pellucidum 3. Anterior horns of the lateral ventricles 4.

Posterior horns of the lateral ventricles, with choroid plexus visible 6. Measurements should be: FetalFetal BiometryBiometry 8. Abdominal Circumference: Section used to measure the abdominal circumference: FetalFetal BiometryBiometry Measurement Technique: Use the ellipse function Measure 2 diameters anterior-posterior d1 and transverse diameter d2. Femur Length: Find the long axis of the fetus Identify femur at caudal end Rotate transducer until whole of femur is seen, as close to horizontal as possible reduce chance of foreshortening of femur Landmarks: Section for measuring the femur length Chitty, et al Freeze image on screen and measure.

Some literature suggest that the femur should be parallel with the transducer and posterior shadowing should be seen behind the femur, to get a good section with the end points clearly defined. Other FetalFetal BiometryBiometry femur, to get a good section with the end points clearly defined. Other authors suggest a slight angulation of the femur, to see the end points better.

What is important is to ensure the femur is close to parallel, otherwise you will get foreshortening. Linear measurement from one end of the femoral diaphysis to the other NOTE: Humerus, radius, ulna etc Feet What to look for when choosing charts: Dating graphs — should use cross-sectional data — 1 measurement From each fetus allows generalisation to be made about population as a whole.

A large sample is needed — and similar number of measurements at each gestational age GA. Growth graphs — longitudinal study — serial measurements of the same fetus. Excluding abnormal pregnancies e. GA is the known variable — so should be placed on the X-axis of the graph. Whose Charts? However, regardless of whose charts are used: Very important to know the origin of the charts used especially if programmed into the machine - always use the correct technique that the author used to ensure FetalFetal BiometryBiometry accuracy - Ensure the correct section is used - Use the correct charts for dating or growth Make sure the image settings are optimal for each section Regular QA checks to ensure accurate measurements Plot the measurements yourself if manual plotting is the norm in your dept.

Factors affecting measurement Accuracy: Calliper inaccuracy 3. Poor image resolution difficulties defining margins 4. Variable landmarks for section 5. Technical limitations: References Altman, D. Charts of fetal size: British Journal of Obstetrics and Gynaecology, , Altman, D. New charts for ultrasound dating of pregnancy.

Ultrasound Obstet Gynecol, 10, Chitty, L. Charts of Fetal Size: Head Measurements. Abdominal Measurements. Femur Length. Dudley, N. Fetal Femoral Angle: How important? You just clipped your first slide! Clipping is a handy way to collect important slides you want to go back to later. Now customize the name of a clipboard to store your clips.

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BMUS published their first Working Party Report on fetal measurements in Fetal size and dating: charts recommended for clinical obstetric practice . Jun 16, In , the British Medical Ultrasound Society (BMUS) recommended a series of charts for ultrasound dating and estimation of fetal size in.

One approach to verifying this calculation is to use data contained in the multiple marker evaluation report that is part of the CAP Maternal Screening Survey FP. This computed risk can then be compared with the actual risk reported by the laboratory. The last step requires the use of published "parameter sets" that mathematically describe the multi-dimensional relationships between these markers in Down syndrome and unaffected pregnancies. Without suitable parameter sets, the Down syndrome risks will not be as reliable as they could be in screening programs. All laboratories should understand the importance of selecting and maintaining the parameter sets used for computing clinical Down syndrome risk estimates.

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RUG has considered evidence on methods of pregnancy dating menstrual history vs ultrasound scan and has concluded that the method of choice, in pregnancies where at least one ultrasound has been done by 22 weeks gestation, should be by ultrasound biometry. There is no evidence for policies which use LMP dates, even if they are within 4,7,10 or 14 days etc within the scan dates. LMP dates are often wrong, as they do not accurately reflect the day of conception i. The arguments are summarised here and referenced in one of our Perinatal Forum reviews. From , all West Midlands units are now dating pregnancies by ultrasound alone. The allocation to the West Midlands was distributed by the Perinatal Institute to all units to purchase ultrasound equipment.

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BMUS published their first Working Party Report on fetal measurements in , at a time when the practice of obstetric ultrasound remained varied, with obstetric units having quite widely differing protocols for the number and timing of scans offered, as well as policies on re-dating pregnancy from ultrasound measurements. That report offered recommendations for the use of validated published tables and formulae for the commonly acquired fetal measurements used in dating and monitoring fetal growth. Since then, practice across England and Wales has become more uniform, particularly following the publication of the NICE guidance on antenatal care 1. BMUS accepted the need to review the old guidance, in order to ensure that the statistical validity of the original recommendations remained intact.

These guidelines were launched in August and contain guidance for fetal monitoring including ultrasound. Key message: Trusts responsible for implementing changes. National week ultrasound Standards. The standards around the fetal anomaly scan have been launched by the NSC. Trusts must meet the minimum standards by 1 April This survey is similar to that undertaken in No implications at this stage. Recommended criteria for measurement of fetal crown rump length. Trusts to review and implement. The resource cards devised by the NSC on screening programmes have been revised for sonographers to use. The audit of referrals has been published on the FASP website.

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