24-hr Urine Iodine Test Results/Clarification

[Guest guest]

Have just received back the results of a 24-hr Urine Iodine Test that

was done because of iodine contrast used in a CT scan a few months

ago. Could someone help clarify these numbers for me? I'm not sure

which number I'm supposed to be looking at.

Iodine Contrast was 58, Iodine was 109.

I'm scheduled to go off thyroid meds tomorrow to prepare for my first

post-RAI scan.

Anita in TX

[Guest guest]

Hi Aniti.....

Looks like you're going to have to wait some more;-)

Nick

********************************************************************************\

*********************************

(Dr. Ain)

Date: Tue, 30 Jan 2001 08:50:16 -0500

Subject: Evaluation of iodide status after contrast dye

In-reply-to:

>I feel like I am in somewhat the same boat. had TT 11/7/00 and RAI 200

>mci 12/19/00. WBS on 12/29/00 showed uptake in neck area only. But now

>I feel a lump on the right side and the left side of my neck is

>swollen. It feels sort of like having a golf ball (no something a bit

>smaller than a golf ball) caught in my throat all the time sort of

>pushing in on my windpipe or something. I am scheduled for a contrast

>CT on 2/20/01 so I guess we'll see then. My doc says maybe more surgery

>and/or more RAI depending on what we see. he says we only have to wait

>6 weeks between CT with contrast and RAI but I know Dr. Ain on this list

>says that the CT with contrast can make the RAI less effecetive for up

>to a year or so. Should I ask my doctor again about this? I like and

>trust him so far...

Dear ThyCa Members:

Stable (non-radioactive) iodine contamination from iodinated contrast dye

is certainly an important potential contribution to I-131 scan & /or

treatment failure. If one has been exposed during the course of a CAT scan

or other radiographic procedure, it is possible that it may take nearly a

year to clear the stable iodine; however, the length of time may vary from

a couple months to more than 10 months. To determine when this iodine has

cleared requires the following:

1). Start a low iodine diet (carefully followed) for one week. Maintain the

usual thyroid hormone medication (Note: this is not a preparation for scan

or therapy).

2). On the last day of the diet, collect an accurate and full 24-hour urine

sample.

3). Have the urine sent for a total urine iodide analysis. The only

commercial lab that I have found to be reliable is at the Mayo Clinic

(Rochester, MN).

4). A total urine iodide of 80 (or less) micrograms in 24 hours

demonstrates that the stable iodine interference has sufficiently passed.

5) If the urine iodide is much higher, it may be useful to wait 1-2 months

and repeat sequence 1) through 4) to evaluate the body's stable iodine

content. This sequence is repeated until the urine value is sufficiently

low. A urine iodide value sufficiently low demonstrates that the full

scan/therapy preparation may be initiated without interference from the

previous contrast dye administration.

This is the general method that I advise physicians to follow in answering

when their patient may be optimally cleared of such stable iodine

contamination. On the other hand, sometimes clinical situations arise in

which it is not possible to wait until every parameter is optimal.

**************PLEASE BE ADVISED*********************

THE INFORMATION CONTAINED IN THIS COMMUNICATION IS INTENDED

FOR EDUCATIONAL PURPOSES ONLY. IT IS NOT INTENDED, NOR SHOULD

IT BE CONSTRUED, AS SPECIFIC MEDICAL ADVICE OR DIRECTIONS. ANY

PERSON VIEWING THIS INFORMATION IS ADVISED TO CONSULT THEIR OWN

PHYSICIAN(S) ABOUT ANY MATTER REGARDING THEIR MEDICAL CARE.

************************************************

B. Ain, M.D.

Associate Professor of Internal Medicine

Director, Thyroid Nodule & Oncology Clinical Service

Director, Thyroid Cancer Research Laboratory

Division of Endocrinology and Molecular Medicine

Department of Internal Medicine, Room MN524

University of Kentucky Medical Center

800 Rose Street, Lexington, Kentucky 40536-0298

********************************************************************************\

*********************************

At 09:18 PM 3/4/2003 +0000, you wrote:

>Have just received back the results of a 24-hr Urine Iodine Test that

>was done because of iodine contrast used in a CT scan a few months

>ago. Could someone help clarify these numbers for me? I'm not sure

>which number I'm supposed to be looking at.

>

>Iodine Contrast was 58, Iodine was 109.

>

>I'm scheduled to go off thyroid meds tomorrow to prepare for my first

>post-RAI scan.

[Guest guest]

Thanks, Nick. I appreciate this. I should get my hard copy of the

test results today and should know how this was measured. Will post

later.

This is pure, utter frustration All I can say at this point is:

NOOOOOOOOOO!!! Why me??????? I need a pitty party NOWWW!!!! Where

was my brain when I needed it?????

Hmmm - that DID make me feel a LITTLE better

Anita in TX

> >Have just received back the results of a 24-hr Urine Iodine Test

that

> >was done because of iodine contrast used in a CT scan a few months

> >ago. Could someone help clarify these numbers for me? I'm not

sure

> >which number I'm supposed to be looking at.

> >

> >Iodine Contrast was 58, Iodine was 109.

> >

> >I'm scheduled to go off thyroid meds tomorrow to prepare for my

first

> >post-RAI scan.

[Guest guest]

Dear Anita:

It sounds as if your iodine levels are somewhere between the levels

obtained on a regular diet (i.e., about 400) and those obtained on a

very well observed LID (i.e., 50). Also, by the time you receive the

RAI for your scan a few weeks from now, your values should be even lower

than the 58 plus 109. I am curious about the iodine contrast number. Do

they actually assay for the iodine contrast in your urine as well as for

free iodine? You could call the lab to find out what that means. When

you get the answer, let us know. I am assuming you went on the LID in

preparation for the iodine assay.

Good Luck,

Marilyn Loeb, Rochester, NY

24-hr Urine Iodine Test Results/Clarification

Have just received back the results of a 24-hr Urine Iodine Test that

was done because of iodine contrast used in a CT scan a few months

ago. Could someone help clarify these numbers for me? I'm not sure

which number I'm supposed to be looking at.

Iodine Contrast was 58, Iodine was 109.

I'm scheduled to go off thyroid meds tomorrow to prepare for my first

post-RAI scan.

Anita in TX

This e-mail support group is one of many free services of ThyCa: Thyroid

Cancer Survivors' Association, Inc. <web site: www.thyca.org>. If you

do not wish to belong to this group, you may UNSUBSCRIBE by

sending a blank e-mail to:

thyca-unsubscribe

[Guest guest]

Thanks, Marilyn.

Ohhhh,Yes, I did go on the LID - twice - in anticipation of this

test. I am very well versed on the LID, at the moment - and look

forward to doing it again for the upcoming scan

I am confused as to whether the two numbers were to be added

together. I should receive the hard copy of the test today and

should be able to post more when this is received. The only thing

that was given to me, verbally, were the two sets of numbers.

Later,

Anita in TX

> Dear Anita:

>

> It sounds as if your iodine levels are somewhere between the levels

> obtained on a regular diet (i.e., about 400) and those obtained on a

> very well observed LID (i.e., 50). Also, by the time you receive

the

> RAI for your scan a few weeks from now, your values should be even

lower

> than the 58 plus 109. I am curious about the iodine contrast

number. Do

> they actually assay for the iodine contrast in your urine as well

as for

> free iodine? You could call the lab to find out what that means.

When

> you get the answer, let us know. I am assuming you went on the LID

in

> preparation for the iodine assay.

>

> Good Luck,

> Marilyn Loeb, Rochester, NY

>

> 24-hr Urine Iodine Test Results/Clarification

>

> Have just received back the results of a 24-hr Urine Iodine Test

that

> was done because of iodine contrast used in a CT scan a few months

> ago. Could someone help clarify these numbers for me? I'm not

sure

> which number I'm supposed to be looking at.

>

> Iodine Contrast was 58, Iodine was 109.

>

> I'm scheduled to go off thyroid meds tomorrow to prepare for my

first

> post-RAI scan.

>

> Anita in TX

[Guest guest]

When I did the 24-hour urine iodine test, seems to me they wanted the

" free iodine " to be below 65.

-Alyssa Idaho Falls

" anitahin2002 " wrote:

>

> Have just received back the results of a 24-hr Urine Iodine Test that

> was done because of iodine contrast used in a CT scan a few months

> ago. Could someone help clarify these numbers for me? I'm not sure

> which number I'm supposed to be looking at.

>

> Iodine Contrast was 58, Iodine was 109.

>

> I'm scheduled to go off thyroid meds tomorrow to prepare for my first

> post-RAI scan.

>

> Anita in TX

>

>

[Guest guest]

Here is a repost from Dr. Ain addressing those numbers.

Gail

--Dear ThyCa Members: Stable (non-radioactive) iodine contamination from

iodinated contrast dye is certainly an important potential contribution

to I-131 scan & /or treatment failure. If one has been exposed during the

course of a CAT scan or other radiographic procedure, it is possible

that it may take nearly a year to clear the stable iodine; however, the

length of time may vary from a couple months to more than 10 months. To

determine when this iodine has cleared requires the following: 1). Start

a low iodine diet (carefully followed) for one week. Maintain the usual

thyroid hormone medication (Note: this is not a preparation for scan or

therapy). 2). On the last day of the diet, collect an accurate and full

24-hour urine sample. 3). Have the urine sent for a total urine iodide

analysis. The only commercial lab that I have found to be reliable is at

the Mayo Clinic (Rochester, MN). 4). A total urine iodide of 80 (or

less) micrograms in 24 hours demonstrates that the stable iodine

interference has sufficiently passed. 5) If the urine iodide is much

higher, it may be useful to wait 1-2 months and repeat sequence 1)

through 4) to evaluate the body's stable iodine content. This sequence

is repeated until the urine value is sufficiently low. A urine iodide

value sufficiently low demonstrates that the full scan/therapy

preparation may be initiated without interference from the previous

contrast dye administration. This is the general method that I advise

physicians to follow in answering when their patient may be optimally

cleared of such stable iodine contamination. On the other hand,

sometimes clinical situations arise in which it is not possible to wait

until every parameter is optimal.--Dr. Ain 1-01

-- In Thyca , Alyssa Dodd <dodd@t...> wrote:

> When I did the 24-hour urine iodine test, seems to me they wanted the

> " free iodine " to be below 65.

>

> -Alyssa Idaho Falls

>

> " anitahin2002 " wrote:

> >

> > Have just received back the results of a 24-hr Urine Iodine Test that

> > was done because of iodine contrast used in a CT scan a few months

> > ago. Could someone help clarify these numbers for me? I'm not sure

> > which number I'm supposed to be looking at.

> >

> > Iodine Contrast was 58, Iodine was 109.

> >

> > I'm scheduled to go off thyroid meds tomorrow to prepare for my first

> > post-RAI scan.

> >

> > Anita in TX

>

[Guest guest]

Anita

> Iodine Contrast was 58, Iodine was 109.

My guess is that this should read

Iodine Contrast: 58, Total iodine: 109.

I am guessing that they did a standard iodine-in-urine test (109) and then

went further to find how much was contrast.

OTOH, these values are in the right ballpark, a bit high, but far better than

500 or 5000, which they would have been some weeks ago.

Ian

Ian Adam

Radiation Safety Officer

The Institute of Cancer Research

Cotswold Road

Sutton

Surrey

SM2 5NG

Tel: 020 8722 4250

Mobile: 07791 702 230

Fax: 020 8722 4300

EMail: iana@...

[Guest guest]

Gail, I just replied to Ian's response before I read your posting.

I know I've read the following at least a hundred times over the past

few weeks and it just didn't sink in. I think Ian's thought that the

combined total is 109 is going to be correct. I won't know until I

see the paperwork.

Until this minute, I think I've been in complete denial at the

thought I'm going to have to put off the FBS for a while. Oh,

brother.

Thanks, Gail.

Anita in TX

> > >

> > > Have just received back the results of a 24-hr Urine Iodine

Test that

> > > was done because of iodine contrast used in a CT scan a few

months

> > > ago. Could someone help clarify these numbers for me? I'm not

sure

> > > which number I'm supposed to be looking at.

> > >

> > > Iodine Contrast was 58, Iodine was 109.

> > >

> > > I'm scheduled to go off thyroid meds tomorrow to prepare for my

first

> > > post-RAI scan.

> > >

> > > Anita in TX

> >

[Guest guest]

Dear Anita:

We do have to wait to see what the 109 and 58 refer to. But I just

don't think that 109 is a bad number, although I would like to have

others weigh in on this, preferably Drs. Ain or Rolla or .

Marilyn

[Guest guest]

Re: 24-hr Urine Iodine Test Results/Clarification

Gail, I just replied to Ian's response before I read your posting.

I know I've read the following at least a hundred times over the past

few weeks and it just didn't sink in. I think Ian's thought that the

combined total is 109 is going to be correct. I won't know until I

see the paperwork.

Until this minute, I think I've been in complete denial at the

thought I'm going to have to put off the FBS for a while. Oh,

brother.

Thanks, Gail.

Anita in TX

> > >

> > > Have just received back the results of a 24-hr Urine Iodine

Test that

> > > was done because of iodine contrast used in a CT scan a few

months

> > > ago. Could someone help clarify these numbers for me? I'm not

sure

> > > which number I'm supposed to be looking at.

> > >

> > > Iodine Contrast was 58, Iodine was 109.

> > >

> > > I'm scheduled to go off thyroid meds tomorrow to prepare for my

first

> > > post-RAI scan.

> > >

> > > Anita in TX

> >

This e-mail support group is one of many free services of ThyCa: Thyroid

Cancer Survivors' Association, Inc. <web site: www.thyca.org>. If you

do not wish to belong to this group, you may UNSUBSCRIBE by

sending a blank e-mail to:

thyca-unsubscribe