Examination Doses
Dose Meter
NegligibleLowModerateHigh

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Quick Reference
0.01 mSv
Chest PA
8 mSv
CT Abdomen
3 mSv
Annual background
20 mSv
Rad worker limit/yr
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Pregnancy Dose Calculator
Most critical period: 8–15 weeks (organogenesis)
Radiation Risk in Pregnancy — Key Facts
Threshold dose for fetal harm
≥ 100 mGy
Below this, no deterministic effects expected
Background fetal dose (40 wks)
~1 mGy
From natural background radiation
CT Abdomen/Pelvis fetal dose
~25 mGy
Well below deterministic threshold
Stochastic risk increase
~0.1%
Per 10 mGy above background lifetime cancer risk
ACR / ACOG Guidance

No single diagnostic imaging procedure results in a dose sufficient to threaten the well-being of a developing embryo or fetus. The risk of not performing needed imaging outweighs the radiation risk for most clinical situations.

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