Ovulation dating a missed miscarriage
If the sex chromosome option is ordered, results will be reported as either low or high probability.
The individual chromosomes are counted and analysed. As every pair is analysed, the results not only indicate the presence or absence of an extra chromosome number 21(Down Syndrome), but excludes chromosome abnormalities in the other 22 chromosome pairs.
In addition, each chromosome pair is stained with a special dye and examined under ultraviolet light.
Warning signs of miscarriage include strong regular period like pains with fresh red bleeding. An ultrasound examination is first performed to a) confirm the dates, b) to assess the position of the placenta, and c) assess the baby for ultrasound signs of chromosomal abnormality such as Down Syndrome.
The time when miscarriage is most likely to occur is the first 24-48 hrs after the test. The test is performed at the ultrasound clinic by an Obstetrician Gynaecologist Sonologist (specialist ultrasound doctor).
The volume of fluid aspirated is about 1/6th of that present around the fetus and this is naturally replaced over the next 24 hours. An amniocentesis is usually performed between 15 and 18 weeks gestation.
It can, however, be performed at any time throughout the remainder of the pregnancy.
Most patients experience a short duration of mild crampy period-like pains. It is not unusual for some patients to experience slight vaginal blood spotting after the test. This is usually related to infection introduced at the time of the procedure.
This is most likely to occur after the local anaesthetic wears off, ie. If the pains worsens or spotting progresses to fresh red bleeding, then contact your doctor. Antiseptic precautions are taken to minimise this risk.
What preparation is required prior to the procedure?
The fetal cells within the amniotic fluid are harvested, cultured and treated to reveal their chromosomes. The laboratory scientist examines the cells for an extra chromosome number 21 (indicating Down syndrome) and for any abnormality in the other 22 pairs of chromosomes.
The test is performed at the ultrasound clinic by an Obstetrician Gynaecologist Sonologist (specialist ultrasound doctor).Tags: Adult Dating, affair dating, sex dating