Does this take a look at produce other names?
Amniotic fluid bilirubin optical density, OD
What is that this take a look at?
This take a look at is finished to see how properly your child is growing inside you. The liquid that surrounds the infant inside your womb known as amniotic fluid. Healthcare suppliers examine the fluid for a pigment known as bilirubin to see whether or not your child has a blood kind that’s incompatible with yours. When this occurs, it might trigger the infant to develop extreme anemia or different issues.
Why do I would like this take a look at?
In case your child has pink blood cell proteins that you do not have, your physique could later mistake the infant for an intruder and assault it via your immune system. This solely occurs to moms who’re Rh-negative and carry infants who’re Rh-positive. Because of this consultants advocate that you simply get examined in your first prenatal go to, and even earlier, to seek out out in case you are Rh-negative. Should you discover out that your and your child’s blood varieties are usually not suitable, you may get remedy that can shield your child.
Chances are you’ll already know whether or not you’ve blood kind A, B, O, or AB. You probably have had a blood kind take a look at, you may additionally know in case you are Rh-positive or Rh-negative. This tells you whether or not you’ve a sure kind of protein (antigen) known as Rh issue on the floor of your pink blood cells. In case your pink blood cells haven’t got this protein, you might be Rh-negative. In the event that they do, you might be Rh-positive.
Your healthcare supplier will take a look at your blood to see whether or not you might be Rh-negative. In case your child is Rh-positive or has different pink cell proteins that you do not have, your physique could make antibodies towards your child’s blood. Your antibodies may cause a few of your child’s pink blood cells to interrupt down. The blood cells include bilirubin. This will result in critical blood issues in your growing child. When this occurs, the bilirubin ranges within the fluid surrounding the infant go up. Testing the fluid for bilirubin ranges will present whether or not the infant has misplaced too many pink blood cells. This manner, healthcare suppliers can begin remedy to assist your child.
Your healthcare suppliers could counsel this take a look at if:
-
You might be Rh-negative
-
You had been uncovered to pink blood cell proteins you do not have via an earlier supply, miscarriage, or blood transfusion
-
Blood exams present that you’ve got rising ranges of antibodies to Rh think about your blood
Testing for bilirubin could also be achieved after 25 weeks of being pregnant. If the lab finds proof that your child has an irregular breakdown of pink blood cells, healthcare suppliers could repeat this take a look at as typically as each 14 days.
What different exams would possibly I’ve together with this take a look at?
You’ll have a blood take a look at to measure your Rh antibody ranges. Earlier than doing the amniocentesis, healthcare suppliers could do an ultrasound to examine the situation of your child. Ultrasound is a kind of imaging research that makes use of sound waves. After 30 weeks, a healthcare supplier can also examine your amniotic fluid to learn how mature your child’s lungs are. This take a look at known as an L/S ratio.
What do my take a look at outcomes imply?
Take a look at outcomes could range relying in your age, gender, well being historical past, and different issues. Your take a look at outcomes could also be totally different relying on the lab used. They might not imply you’ve an issue. Ask your healthcare supplier what your take a look at outcomes imply for you.
Bilirubin is a pigment, so it may well change the colour of amniotic fluid, making it amber or yellow. The commonest approach bilirubin is measured in amniotic fluid is by discovering its optical density (OD).
-
A degree of 0.28 OD to 0.46 OD at 28 to 31 weeks is taken into account low. This implies your child possible doesn’t have an irregular pink blood cell breakdown or could have solely a really gentle anemia.
-
A degree of 0.47 OD to 0.90 OD means your child could have average pink cell illness. In that case, the infant will possible want a blood transfusion within the womb. Your healthcare supplier can also advocate an early supply in case your being pregnant has reached 32 or 33 weeks.
-
A degree of 0.91 OD to 1.0 OD means your child is in danger for extreme anemia from the breakdown of pink blood cells. Healthcare suppliers name this hemolytic anemia. Your child might have a blood transfusion within the womb. Your healthcare supplier can also advocate an early supply at 32 to 33 weeks.
-
A degree of lower than 0.04 OD towards the tip of your being pregnant means your child is reaching maturity and isn’t at risk of this sort of anemia.
How is that this take a look at achieved?
This take a look at removes a tiny quantity of the fluid in your womb for testing. The process to take away the fluid is called amniocentesis. The take a look at could also be achieved on the hospital or at your healthcare supplier’s workplace. A healthcare supplier will first rub or inject a numbing medication into your stomach. Then they are going to then place an extended, very skinny needle into your womb and take out about 5 to 10 milliliters of fluid (about 1 to 2 teaspoons). Your physique will exchange this fluid in a number of hours. After amniocentesis, your healthcare supplier could ask you to not have intercourse or train for the remainder of the day. In any other case it’s possible you’ll return to all of your regular actions.
Does this take a look at pose any dangers?
Amniocentesis is a secure process. Nevertheless it carries a small threat of damage to the infant, rupture of membranes, miscarriage, bleeding, an infection, or leaking of amniotic fluid. You must focus on these dangers together with your healthcare supplier. Chances are you’ll really feel a stinging sensation when the needle goes in. You might also really feel some strain or discomfort because the fluid is withdrawn. Afterward, you might have some gentle cramping. Having amniocentesis could improve your threat of growing antibodies throughout a future being pregnant. To cut back this threat, your healthcare supplier could provide you with an injection of a drugs known as Rho (D) immune globulin (RhoGAM).
What would possibly have an effect on my take a look at outcomes?
Hemolytic anemia from the breakdown of pink blood cells is the commonest reason for irregular take a look at outcomes. Different forms of fetal issues or illnesses that destroy pink blood cells within the womb could result in irregular outcomes too. You probably have hepatitis or a sickle cell disaster whereas pregnant, this may occasionally additionally have an effect on the outcomes.
Your take a look at outcomes could also be affected in case you have taken any steroid medicines. Different issues that may have an effect on the outcomes embrace:
-
Blood within the fluid pattern
-
Stool from the infant within the fluid pattern
-
Publicity of the fluid pattern to gentle
-
The newborn’s blood plasma is just too acidic (fetal acidosis)
How do I prepare for this take a look at?
If you’re having an ultrasound earlier than the amniocentesis, you must drink fluids 1 hour earlier than and arrive for the take a look at with a full bladder in case your being pregnant is 20 weeks or much less. If you’re 21 weeks or past you needn’t drink further fluids and you’ll urinate earlier than the take a look at. Discuss together with your healthcare supplier about any particular directions you must observe. No different preparations are wanted.