Aa
A
A
Close
Blank
510230 tn?1211724783
fasting before a tsh test
ok..first i was told to fast before the tsh test and then another nurse told me i didnt have to..so which one is it? that would probably cause a high tsh level right? i was the one with the tsh of 139. that couldve been way off from a cup of coffee and an egg? hummm..how much could it have thrown it off then? wow..im hoping it threw it off and the tsh is really down at a 90 or even a 60..its not uncommon for mine to be that high.it was at 96 when i was 3 months pregnant..humm.anyone know..
Cancel
3 Answers
3 Answers
Page 1 of 1
168348 tn?1379360675
IMHO, but I'm a patient and not a doc .. is whatever way you do it be consistent for ea. test .. I have done it both ways as the first time I wasn't sure and also I had cholesterol tests so was forced, then the next mo fasted again and then subsequent tests did not fast and I was told by lab that TSH doesn't make a difference.  My answer is in regard to TSH and T3 T4 . that is what LabCorp and Quest told me.

C~
Comment
Cancel
168348 tn?1379360675
Comment
Comment
Submit Comment
213044 tn?1236531060
The time of day the blood is drawn will affect the TSH result, slightly. Not enough to matter in your case. Maybe a point or two.

Taking thyroid meds before a blood draw will affect the Free T4 slightly. Again, in your case, it won't make enough difference to worry about.

It is best to have a blood draw early in the morning, before taking thyroid meds. However, as Cheryl mentioned, consistancy is the key. Having it done the same way each time, as best you can. When it gets to the point that they are fine tuning your levels, it matters.

You're about 138 points away from worrying about fine tuning, and whether you take any thyroid meds before a draw will not affect your tests in a significant way right now.
Comment
Cancel
213044 tn?1236531060
Comment
Comment
Submit Comment
314892 tn?1264627503
Fasting will not change the TSH value at all.

It is important to fast before tests such as cholesterol, triglycerides and glucose.

Comment
Cancel
314892 tn?1264627503
Comment
Comment
Submit Comment
Your Answer
510230 tn?1211724783
Answer
Know how to answer? Tap here to leave your answer...
Answer
Submit Answer
A
A
Blank
Weight Tracker
Weight Tracker
Start Tracking Now
Thyroid Disorders Community Resources
RSS Expert Activity
233488 tn?1310696703
Blank
Marathon Running Done Over Many Yea...
May 21 by John C Hagan III, MD, FACS, FAAOBlank
233488 tn?1310696703
Blank
New Article on Multifocal IOL vs &q...
May 21 by John C Hagan III, MD, FACS, FAAOBlank
748543 tn?1443740527
Blank
TMJ/TMJ The Connection Between Teet...
01/15 by Hamidreza Nassery , DMD, FICOI, FAGD, FICCMOBlank
Top Thyroid Answerers
649848 tn?1424570775
Blank
FL
Avatar universal
Blank
MI
Avatar universal
Blank
Sisters, OR
1756321 tn?1377771734
Blank
Queensland, Australia
Avatar universal
Blank
657231 tn?1453836403
Blank
Northern, NJ