Showing posts with label obg. Show all posts
Showing posts with label obg. Show all posts
Friday, 23 February 2018
Radiation in pregnancy
*Maximum permissible dose of radiation in pregnancy is 0.5 rads (not 5 rads).
*The risk is greatest at = 8–15 weeks.
*Larger doses will be required at = 16–25 weeks to cause an equivalent proportion of cases of mental retardation.
*Current evidence suggests that there is no increased risk of malformations, growth restriction, or abortion from a radiation dose of = 0.5 rads or less.
*MRI uses nonionizing radiation and is very safe.
*MC fetal indication for MRI is suspected brain anomaly.
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