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Re: I-131 Tx to pregnant patient
Please, GO TO http://www.icrp.org/educational_area.asp
LOOK AT ICRP 84, PREGNANCY AND MEDICAL RADIATION, download and
GO TO NUCLEAR MEDICINE AND PRAGNANT PATIENTS
LOOK AT THE TABLE - Approximate whole body fetal dose (mGy) from common
nuclear medicine procedures
and you will find your answer
Jose Julio Rozental
joseroze@netvision.net.il
Israel
----- Original Message -----
From: <JGarrett@mbhs.org>
To: <radsafe@list.vanderbilt.edu>
Sent: Monday, December 22, 2003 11:59 PM
Subject: I-131 Tx to pregnant patient
> Dear Rad Safers:
>
> I was just informed that there was a patient a couple of weeks ago who
> received an I-131 treatment for residual thyroid disease post
> thyroidectomy. The pregnancy test on the day of the therapy was negative.
> However, a few days later, 5 -6, the patient's period was late. The
> subsequent serum test demonstrated a positive test for pregnancy. I have
> done some initial calculation for the dose to the uterus/embryo. The
amount
> of I-131 administered was 75 mCi. The calculations I have performed are
> given below. My first question is what method would yall use since there
is
> such a drastic difference between the two methods? Thanks for your help.
>
> NRC Guide 8.36 Radiation Dose to the Embryo/Fetus Method
> Dose = I x f1 x DF, where I = initial activity in uCi = 75 mCi=75000 uCi,
> f1 is fractional uptake to the blood = 1.00, and DF is the dose factor =
> 3.64E-3 rem/uCi
> Dose = (75000 uCi)*(1.00)*(3.64E-03 rem/uCi) = 273 rem => 273 rads to the
> embryo.
>
> Using Tabular values from internaldosimetry.com
> Dose to Uterus = 2.2E-01 rad/mCi
> Dose = (75 mCi)*(2.2E-01 rad/mCi) = 16.5 rad to the embryo
>
>
> Jeffrey A. Garrett, MS, DABR
> Chief Physicist
> Mississippi Baptist Medical Center
> 1225 North State Street
> Jackson, MS 39202
>
> Office: 601-968-1725
> Cancer Center: 601-968-1416 or 1420
> Fax: 601-960-3317
>
>
>
>
>
> The information contained in this email is confidential and is intended
for the recipient only. Do not forward this email without permission from
its originator.
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