Aa
TSH test at two seperate labs.
Recently I tested ultra TSH at two seperate labs.
One lab shows normal range from 3.5 to 5.5
whereas other showed 0.5 to 4.6.
Is there any relation between these results from two labs with different ref range?
I mean, if we know the result of first lab can we predict(approximate value) of the result of second lab?
One lab shows normal range from 3.5 to 5.5
whereas other showed 0.5 to 4.6.
Is there any relation between these results from two labs with different ref range?
I mean, if we know the result of first lab can we predict(approximate value) of the result of second lab?
COMMUNITY LEADER
That was a poor choice of words on my part. Yes, the reference range is based on the method used to run the test; however, the reference range does not determine the result. It only shows whether or not your results are within the range for that lab; therefore, you can not predict results from one lab based on results or reference ranges from another lab.
Aside from that, don't forget that TSH fluctuates, so you would have to look at each result and reference range individually.
Aside from that, don't forget that TSH fluctuates, so you would have to look at each result and reference range individually.
1. The reference range the lab uses really has nothing to do with the test result.
2. Reference ranges are usually determined by the method the lab uses to analyze a certain parameter - in this case TSH,.
If statement 1 is true then why Reference range has to depend on the method the lab uses to analyze a certain parameter?
2. Reference ranges are usually determined by the method the lab uses to analyze a certain parameter - in this case TSH,.
If statement 1 is true then why Reference range has to depend on the method the lab uses to analyze a certain parameter?
COMMUNITY LEADER
The actual results would be whatever the individual labs came up with. You can't predict the result of one test based on results of another because TSH can fluctuate even throughout a single day; so if you had one test done in the morning, and another done in the afternoon, it's very possible that you could come up with 2 very different results.
About 7-8 yrs ago, the AACE recommended that all labs use the reference range of 0.3-3.0; most do still do not use that range. The reference range the lab uses really has nothing to do with the test result. The result is the amount of TSH in your blood, the reference range is simply the range THAT lab uses to determine if your result is "normal" or not. Reference ranges are usually determined by the method the lab uses to analyze a certain parameter - in this case TSH,.
About 7-8 yrs ago, the AACE recommended that all labs use the reference range of 0.3-3.0; most do still do not use that range. The reference range the lab uses really has nothing to do with the test result. The result is the amount of TSH in your blood, the reference range is simply the range THAT lab uses to determine if your result is "normal" or not. Reference ranges are usually determined by the method the lab uses to analyze a certain parameter - in this case TSH,.
Have an Answer?
You are reading content posted in the Thyroid Disorders Community
We tapped the CDC for information on what you need to know about radiation exposure
Endocrinologist Mark Lupo, MD, answers 10 questions about thyroid disorders and how to treat them
A list of national and international resources and hotlines to help connect you to needed health and medical services.
Herpes sores blister, then burst, scab and heal.
Herpes spreads by oral, vaginal and anal sex.
STIs are the most common cause of genital sores.
