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Detailed Answer:
Hi XXXXXXX mehta,
Thanks for writing in to us.
Placenta thickness is usually evaluated in the second and third trimesters.
Usually the approximate
gestational age (in weeks) = placental thickness +/- 10 mm with an upper limit of 4 cm.
If we use this formula in your situation the placental thickness at 31 weeks may be considered normal if it measures 3.4 cm. So you can relax as far any serious consequences due to thick placenta are considered.
However, a true thickened placenta can cause
placental insufficiency which can further cause problems to the baby during delivery and may also affect growth of the baby inside the mother in some cases. As you have already confirmed that baby's growth is fine there is nothing to worry as far placental thickness is concerned.
AFI or
amniotic fluid index is taken as normal if it is between 8 to 18 during most of the pregnancy though the values change with the gestational age. At 31 weeks the desirable AFI is 14.4. At 10 your AFI is slightly on the lower side of normal. The decrease in AFI can be just a normal variation for you.
In severe cases it can be related to fetal
urinary tract abnormalities, uteroplacental insufficiency, due to dehydration in the mother or for no specific reason. Low AFI also increases the chances of complications like
premature birth and various birth defects (like hypoplastic lungs) in the newborn as well as miscarriage and stillbirth.Risk factors include
gestational diabetes, hypertension,
high blood pressure and preeclampsia.
If there was any serious problem with your baby, it would have been known. However, ultrasound scans at regular intervals of at least two weeks are suggested to check for any further changes in AFI. As precaution the mother is advised to take in adequate amounts of water, fluids and fresh juices. Always be in touch with your doctor.
Hope your query is answered.
Do write back if you have any doubts.
Regards,
Dr.Vivek