Hypothyroid blood test: How many weeks after... - Thyroid UK

Thyroid UK

137,148 members160,828 posts

Hypothyroid blood test

4 Replies

How many weeks after starting to take eltroxin , can we take blood test to test the ft3 ft4 and tsh values...( Now am on my 5th week taking eltroxin) ?? And while taking blood test in the morning , should I take eltroxin and then take blood test ?? Or without taking eltroxin should I take blood test ? Am confused.. each one saying different things.. v should nd v should not.. pls help !

Read more about...
4 Replies
greygoose profile image
greygoose

You need to leave at least six weeks before retesting.

Have the blood draw early in the morning - before 9 am - after fasting over-night.

Leave a 24 hour gap between your last dose of eltroxin and the blood draw. That way, you get the highest TSH and the lowest FT4 - which is what you need if you want an increase in dose.

Always have your blood tests done under the same circumstances so that you can compare results.

in reply to greygoose

Thank u so much 😊

greygoose profile image
greygoose in reply to

You're welcome. :)

SlowDragon profile image
SlowDragonAdministrator

So have you had blood retested yet?

Dose needs increasing in 25mcg steps until TSH around one and FT4 towards top of range and FT3 at least half way in range

All thyroid tests should be done as early as possible in morning and fasting and don't take Levo in the 24 hours prior to test, delay and take straight after. This gives highest TSH, lowest FT4 and most consistent results

Testing

TSH, FT4 and FT3, plus thyroid antibodies

Vitamin D, folate, ferritin and B12 too ideally

Put results and ranges on a new post and members can advise

You may also like...

Blood test results - hypothyroid

My ‘normal’ test results are FT4 : 7.8 (7.7 - 15.1), TSH: 3.90 (0.34 - 5.6). The TSH has come down

help with nhs blood test please for hypothyroid

also should I have had more tests done? I am so exhausted/ill I just don't understand blood tests....

Hypothyroidism Help please - Blood test results

Last blood tests were TSH 0.10 and T4 22.6. GP has reduced my Levo dose however the blood test...

Results of blood tests - interpretation, am I hypothyroid?

advice in this forum to request a T3 test, I now have my blood test results and would be grateful...

Blood Test Results - Newly Diagnosed Hypothyroidism & TTC

all who responded. As suggested, I had some blood tests done with Medichecks, the results are below.