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  • Is there a "best" time of day for a blood draw?

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    Old 08-25-2007, 08:19 PM   #1
    hopalong_too
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    Question Is there a "best" time of day for a blood draw?

    I got my requisition in the mail. It is costing a small fortune. If this is not conclusive....I may just have to give up! I am going to have all the thyroid tests done again in an effort to find out what is going on since my doctor has said everything is "normal"!! Is there a "best" time of day to have the test done so I can have a better picture of any problem? Also does fasting/not fasting make ANY difference? How about time of month? Thanks everyone for your insight and expertise!

     
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    Old 08-26-2007, 12:17 AM   #2
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    Re: Is there a "best" time of day for a blood draw?

    I'm my understanding it's best go to the lab as soon as possible after waking up after a good night sleep - don't drink coffee or have a smoke before labs, just in case .

    What's "normal" according to your doctor?

    Last edited by FinnMaid; 08-26-2007 at 12:21 AM.

     
    Old 08-26-2007, 12:47 AM   #3
    hopalong_too
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    Re: Is there a "best" time of day for a blood draw?

    Hi FinnMaid, These were the latest lab results:

    1995
    TSH .65 (.38-6.15)

    2003
    TSH .87 (.35-5.5)

    08/10
    TSH .793 (.35-5.5)
    Total T3 98 (85-205)

    08/17
    TSH 1.45 (.35-5.5)
    FT3 310 (230-4 2 0)
    FT4 .96 (.61-1.76)
    TPO 21.8 (0-35)

    TSH has been low end of range so often! Total T3 and FT4 are also at the lower end BUT in range! Antibodies are present but not HIGH! I have gained 15 pounds in the past 2 years and 8 pounds the year before that! I am always tired. I am taking depression medication...I thought that was the issue until I started reading about thyroid symptoms and just kept thinking---- that's me! My hands and feet are ALWAYS cold! I could go on and on! My doctor is convinced it is depression or menopause. (He did a blood test for menopause and...low and behold...my ovaries are working just fine. So I'm not menopausal yet!)

    Any comment? Are you saying it is better to fast or that I must fast?

     
    Old 08-26-2007, 12:55 AM   #4
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    Re: Is there a "best" time of day for a blood draw?

    I'd recommend fasting "just in case" - if you have fasted you know eating hasn't had an effect on the results.

    Your last labs do seem pretty normal to me too - but since you have symptoms you should continue to follow the situation.

    Last edited by FinnMaid; 08-26-2007 at 06:39 AM.

     
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