Obstetric dating scan dating with std

For all Obstetrics scans, no special preparation is needed, although it is best to wear loose clothing that can easily be lifted or removed in order to expose your abdomen.

You will lie on your back on an examination couch and the transducer moved back and forth across your stomach in order to gain the best possible image of the fetus.

Transvaginal Scans With specially designed probes, ultrasound scanning can be done with the probe placed in the vagina of the patient.

Other placental abnormalities in conditions such as diabetes, fetal hydrops, Rh isoimmunization and severe intrauterine growth retardation can also be assessed.

Computer softwares and lookup charts are readily available.

Progressive increase in the width of the translucent area during the 11- to 14-week measurement period is thus indicative of congenital lymphedema.

Scan measurements are taken such that the dates of the pregnancy can be confirmed or determined. When you arrive for your scan you will be asked to fill out a form about when your last menstrual cycle took place (if known) and some other details relevant to the scan.

Other information obtained includes whether the pregnancy is in the uterus or outside the uterus (an ectopic pregnancy), how many embryos there are, and whether there are any complications surrounding the pregnancy at this early stage. You will be called by the sonographer who will take you to the scanning room.

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A rather thorough discussion paper on Ultrasound screening in pregnancy can be found here.The scan can confirm the number of babies in the uterus, the embryo can be observed and measured by about five and a half weeks and a heartbeat usually detected by 6 weeks.Scans at this stage in pregnancy are reassuring for women experiencing bleeding, pain or who have had previous miscarriages.It can also help to diagnose abnormalities or problems, help determine the age of the pregnancy and subsequent due date as well as showing the position of the placenta in relation to the birth canal.The Royal College of Obstetricians & Gynaecologists (in their 2000 document on Ultrasound Screening), recommend an Early Pregnancy Scan, undertaken before 15 weeks, which can combine the functions of the Early Viability Scan, Nuchal Translucency Scan and dating scan. These two scans are the ‘minimum’ number of scans required during pregnancy and are offered by ¾ of ultrasound units in the UK.After emptying your bladder and wearing a gown you will lie on the bed and a special probe is positioned in your vagina. During this examination the vaginal probe is moved with varying pressure at different angles to obtain images of the uterus and ovaries.

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