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Ask Dr. David Your Own Question
Dr. David
Dr. David, Board Certified MD
Category: Medical
Satisfied Customers: 45914
Experience:  Board Certified Physician
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I have had a blood test done health, my thyroid

Customer Question

I have had a blood test done for general health, my thyroid test said my T4 levels were a bit low. What does this mean and should I have a thyroid function blood test done privately for more information?
Submitted: 2 years ago.
Category: Medical
Expert:  Dr. David replied 2 years ago.
Dr. David :

This is Dr. David

Dr. David :

T4 and T3 levels can often vary slightly up and down.

Dr. David :

the best measure of total thyroid hormone levels is a TSH or thyroid stimulation hormone level test.

Dr. David :

TSH should be between 0.3 and 3.0 range for your thyroid hormone levels to be normal.

Dr. David :

did you get your TSH levels checked?

JACUSTOMER-s0a5c2a3- :

I dont know, I keep getting coughs, colds and a temperature, often feel tired and though I dont eat that much I dont lose weight

Dr. David :

I see.

Dr. David :

ask your doctor and get a copy of your blood testing reports

Dr. David :

and see if they checked for TSH levels.

Dr. David :

at age 55, you are most likely after your menopause.

Dr. David :

after menopause, your metabolism can slow down as your body produces less estrogen.

Dr. David :

so this can cause hot flashes and cause you to feel tired and grain weight

Dr. David :

have you tried to exercise regularly?

Dr. David :

exercise can help improve your energy and metabolism and help you sleep better at night time and help you loose weight.

Dr. David :

I have to see a patient right now.

Dr. David :

I'll be back in a second.

JACUSTOMER-s0a5c2a3- :

What are TSH levels?

JACUSTOMER-s0a5c2a3- :

My TSH level was 2.83, and T4 level 10.2 I have just got results from the drs.

Dr. David :

your TSH of 2.83 is pretty close to the normal range.

Dr. David :

so you did get your TSH levels checked.

Dr. David :

TSH should be between 0.3 and 3.0

Dr. David :

so it is not your thyroid hormone levels which is causing your low energy and difficulty with weight gain.

Dr. David :

hello?

JACUSTOMER-s0a5c2a3- :

What does the T4 level mean

Dr. David :

T4 is the most common type of thyroid hormone in your body.

Dr. David :

it is called thyroxine

Dr. David :

and is the main thyroid hormone your thyroid gland produces.

JACUSTOMER-s0a5c2a3- :

Apparently I am to have a thyroid test redone in 3 months why if everything is ok

Dr. David :

about 20% of it gets converted into T3 hormone.

Dr. David :

well, if everything is the same and ok in 3 months retest, then your thyroid hormone levels are normal.

Dr. David :

and it is something else which is causing your fatigue and weight gain issues.

Dr. David :

does this make sense?

JACUSTOMER-s0a5c2a3- :

No

Dr. David :

what other questions do you have?

Dr. David :

normal T4 levels should be between 4.5 to 11.2 micrograms per deciliter (mcg/dL).

Dr. David :

so your 10.2 for T4 is in the normal range.

Dr. David :

http://www.nlm.nih.gov/medlineplus/ency/article/003517.htm

JACUSTOMER-s0a5c2a3- :

So no need to get a blood test done privately then , I was told it should be 12 to 22

Dr. David :

what are the units of the T4?

Dr. David :

normal T4 levels should be between 4.5 to 11.2 micrograms per deciliter (mcg/dL).

Dr. David :

you can see here

Dr. David :

http://www.nlm.nih.gov/medlineplus/ency/article/003517.htm

JACUSTOMER-s0a5c2a3- :

I dont know she said mine was 10.2 normal is 12 to 22

Dr. David :

http://en.wikipedia.org/wiki/Thyroid_function_tests

Dr. David :

she might have been talking about free T4 normal range

Dr. David :

free T4 is between 12-23 pmol/L








pmol/L
Dr. David :

free T4 is different from T4

JACUSTOMER-s0a5c2a3- :

Confused!

Dr. David :

T4 hormone can sometimes be found to a protein called thyroid binding globulin.

Dr. David :

T4 measures all of your T4 hormone.

Dr. David :

free T4 measures just the T4 which is not bound to thyroid binding globulin.

Dr. David :

normal free T4 should be between 12-23 pmol/L

Dr. David :

normal T4 should between 4.5 to 11.2 mcg/dL

Dr. David :

I would see your doctor again and get your blood test results.

Dr. David :

I would be happy to review them with you again.

JACUSTOMER-s0a5c2a3- :

Thank you. Goodbye

Dr. David :

you are welcome

Dr. David :

please leave positive feedback below when done.

Dr. David :

we only get credit for helping clients after positive feedback.

Dr. David :

do you see the rating area below?

JACUSTOMER-s0a5c2a3- :

You didnt really answer my question and were very confusing

Dr. David :

why did you leave negative feedback?

Dr. David :

I am still here willing to help you