How many blood tests to identify under active t... - Thyroid UK

Thyroid UK

141,246 members166,490 posts

How many blood tests to identify under active thyroid.

Elland profile image
7 Replies

Hello, I was tested for a possible thyroid problem in March, those results were borderline and due to family history and symptoms I was retested 6 weeks later. That test result said ‘patient is now hypothyroid’ on my notes so I retested last week and the results are now in the normal range.

Is that the end of testing for thyroid issues? I still have symptoms but I don’t know if people test multiple times before diagnosis. I’m just curious if that’s what happens, or do most people only have one or two tests?

Written by
Elland profile image
Elland
To view profiles and participate in discussions please or .
Read more about...
7 Replies
Jaydee1507 profile image
Jaydee1507Administrator

Welcome to the group. If you could complete your profile it helps members understand your thyroid journey so far and offer recommendations better. Click on your image icon to start.

What time of day have you been testing? TSH which is the most likely thing your GP is going on is highest at 9am so we recommend booking tests for then or as close as possible.

According to NICE guidelines you can get a diagnosis and treatment after 2 consecutive NHS tests with a TSH above range or one above 10.

You really need to get some printed copies of all your thyroid results to see what has happened here. You are legally entitled to a printed copy of your results, ask at GP reception. In England you can get the NHS app and ask for permission to see your blood results on that by asking at GP’s reception. Start a new post and post the results here with their ranges - numbers in brackets after your result.

When hypo we get low stomach acid which means we cannot absorb vitamins well from our food, regardless of a great diet. For thyroid hormone to work well we need OPTIMAL levels of vitamins. Have you recently or could you ask your GP to test levels of ferritin, folate, B12 & D3? Private tests are available, see link for companies offering private blood tests & discount codes, some offer a blood draw service at an extra cost. thyroiduk.org/help-and-supp...

There is also a new company offering walk in & mail order blood tests in Crawley, Hove and Reigate areas. No charge for blood draw in clinic. Check to see if there is a blood test company near you. onedaytests.com/products/ul...

Only do private postal testing early Monday or Tuesday morning.

Do you know if you had positive thyroid antibodies? Many with autoimmune thyroid disease aka Hashimoto's benefit from a gluten free diet. A smaller percentage of those also need to remove dairy from their diet to feel well. These are intolerances and will not show up on any blood test. It’s worth trialling a strictly gluten free diet to see if it helps symptoms.

Recommended blood test protocol: Test at 9am (or as close as possible), fasting, no biotin containing supplements for 3-7 days (Biotin can interfere with thyroid blood results as it is used in the testing process)? Testing like this gives consistency in your results and will show stable blood levels of hormone and highest TSH which varies throughout the day.

Elland profile image
Elland in reply toJaydee1507

Thank you. I had no idea about testing times.

My first blood test was 11am, second 8am and third was 9.50am. I can’t see that I was tested for ferritin, folate, B12 or D3. I shall ask for that. I realise that my original post misquoted my second result and it said I am becoming hypothyroid, not that I was hypothyroid.

Jaydee1507 profile image
Jaydee1507Administrator in reply toElland

Also get hold of your actual results and make a new post and post them here for people to comment.

Hypo people find that we have to be very active in our treatment and care. Arm yourself up with a bit of knowledge from reading this group and you will likely need to challenge your GP/s on how to help you feel well.

SeasideSusie profile image
SeasideSusieRemembering

Elland

That test result said ‘patient is now hypothyroid’ on my notes

Why didn't they start you on Levo then?

Do you have the actual test results with their reference ranges please?

Did you do the test as we always advise:

* Book the first appointment of the morning, or with private tests at home no later than 9am. This is because TSH is highest early morning and lowers throughout the day.

In fact, 9am is the perfect time, see first graph here, it shows TSH is highest around midnight - 4am (when we can't get a blood draw), then lowers, next high is at 9am then lowers before it starts it's climb again about 9pm:

healthunlocked.com/thyroidu...

If we are looking for a diagnosis of hypothyroidism, or looking for an increase in dose or to avoid a reduction then we need TSH to be as high as possible.

* Nothing to eat or drink except water before the test - have your evening meal/supper as normal the night before but delay breakfast on the day of the test and drink water only until after the blood draw. Certain foods may lower TSH, caffeine containing drinks affect TSH.

* If taking thyroid hormone replacement, last dose of Levo should be 24 hours before blood draw. If taking NDT or T3 then last dose should be 8-12 hours before blood draw, split dose and adjust timing the day before if necessary. This avoids measuring hormone levels at their peak after ingestion of hormone replacement. Take your thyroid meds after the blood draw. Taking your dose too close to the blood draw will give false high results, leaving any longer gap will give false low results.

* If you take Biotin or a B Complex containing Biotin (B7), leave this off for 3-7 days before any blood test. This is because if Biotin is used in the testing procedure it can give false results (most labs use biotin).

These are patient to patient tips which we don't discuss with phlebotomists or doctors.

Were thyroid antibodies tested?

Elland profile image
Elland in reply toSeasideSusie

Thank you. I had no idea about testing times.

My first was 11am, 2nd at 8 and third at 9.50. I’d also had a lot of tea before all the tests. I misquoted from my notes having checked again, after the second test it said I was becoming hypothyroid, not was.

Blood test
SeasideSusie profile image
SeasideSusieRemembering in reply toElland

OK, so if you make sure any future tests are 9am then you will get results which will be the highest TSH possible and hopefully get the 2 x over range ones you need. If thyroid antibodies are tested and are positive then that should be a clincher.

SlowDragon profile image
SlowDragonAdministrator in reply toElland

What were results from first and third tests

Just testing TSH is completely inadequate

Request GP test TSH, Ft4 and Ft3 plus thyroid antibodies and vitamin levels

For full Thyroid evaluation you need TSH, FT4 and FT3 tested 

Also both TPO and TG thyroid antibodies tested at least once 

Very important to test vitamin D, folate, ferritin and B12 at least once year minimum

About 90% of primary hypothyroidism is autoimmune thyroid disease, usually diagnosed by high thyroid antibodies 

Autoimmune thyroid disease with goitre is Hashimoto’s

Autoimmune thyroid disease without goitre is Ord’s thyroiditis. 

Both are autoimmune and generally called Hashimoto’s.

Low vitamin levels are extremely common when hypothyroid, especially with autoimmune thyroid disease 

20% of autoimmune thyroid patients never have high thyroid antibodies and ultrasound scan of thyroid can get diagnosis 

In U.K. medics hardly ever refer to autoimmune thyroid disease as Hashimoto’s (or Ord’s thyroiditis)

Recommended that all thyroid blood tests early morning, ideally just before 9am and last dose levothyroxine 24 hours before test 

This gives highest TSH, lowest FT4 and most consistent results. (Patient to patient tip)

Private tests are available as NHS currently rarely tests Ft3 or all relevant vitamins

List of private testing options and money off codes

thyroiduk.org/getting-a-dia...

Medichecks Thyroid plus antibodies and vitamins

medichecks.com/products/adv...

Blue Horizon Thyroid Premium Gold includes antibodies, cortisol and vitamins

bluehorizonbloodtests.co.uk...

Only do private testing early Monday or Tuesday morning. 

Link about thyroid blood tests

thyroiduk.org/getting-a-dia...

Link about Hashimoto’s

thyroiduk.org/hypothyroid-b...

Symptoms of hypothyroidism 

thyroiduk.org/wp-content/up...

Tips on how to do DIY finger prick test 

healthunlocked.com/thyroidu...

Don’t test in a heatwave as increases risk blood getting too hot in post

Not what you're looking for?

You may also like...

Under active thyroid

Hi everyone I wonder if anyone is able to give me some advice on my bloods, the drs aren't really...
Lmcb2024 profile image

Under active thyroid

I have recently been told that I have thyroid disease by endocrinologist who was very vague and...
Viio3 profile image

Under active thyroid

Hello I've just been diagnosed as having an under active thyroid, I've been given 25g of...
Kateybee profile image

UNDER-ACTIVE THYROID?

I had a blood test (admittedly this was a few years ago) as i exhibit and suffer from many symptoms...
Lunarises profile image

Under active thyroid

Hi all, this is all new to me but I was diagnosed with under active thyroid about 5 - 6 years ago...
Shezxxx profile image

Moderation team

See all
Jaydee1507 profile image
Jaydee1507Administrator
PurpleNails profile image
PurpleNailsAdministrator
SlowDragon profile image
SlowDragonAdministrator

Content on HealthUnlocked does not replace the relationship between you and doctors or other healthcare professionals nor the advice you receive from them.

Never delay seeking advice or dialling emergency services because of something that you have read on HealthUnlocked.