Blood tests - how much difference does timing m... - Thyroid UK

Thyroid UK

141,246 members166,490 posts

Blood tests - how much difference does timing make?

Legomami profile image
11 Replies

I posted last week about my symptoms and recent blood results but I had them done before reading here so I did them mid morning and had breakfast and coffee beforehand! My question is, how much difference might this have made?

I’ve now been told by another nhs professional that my results are normal so I am going to book a private consultation with a specialist. I know the results are not wildly abnormal so I guess I am worried that any small difference could have an effect on the interpretation.

Thyroid seems to me to be a reasonable possibility with my symptoms but I guess I feel that professionals think I’m trying to find something that the bloods don’t show. If anyone could give more comment on my original post it’s here healthunlocked.com/thyroidu...

Written by
Legomami profile image
Legomami
To view profiles and participate in discussions please or .
Read more about...
11 Replies
SlowDragon profile image
SlowDragonAdministrator

yes TSH would be higher if tested early morning

are these the most recent results from previous post

TSH 1.9 (0.27-4.4)

FT3 5.5 (3.1-6.8)

FT4 10.8 (8.9-17.3)

thyroglobulin antibodies 27.7 (0-115)

TPO 32.2 (0-34)

HbA1c 42 (42-47 is “pre diabetic”) has been borderline for a few years, when I tracked with a continuous glucose monitor for 4 weeks my levels were normal and estimated HbA1c from that system was 32. I know this can be affected by iron deficiency and other things.

B12 462 (130-900)

Folate >23.8 (>3)

Ferritin 28 (15-300) taking ferrous gluconate and feroglobin long term, ferritin is always <10 when not supplementing, attributed to heavy periods since first checked 15 years ago.

Your ferritin is deficient and won’t be helping

greygoose profile image
greygoose in reply toSlowDragon

yes TSH would be lower if tested early morning

Think you mean TSH would be higher, no? :)

SlowDragon profile image
SlowDragonAdministrator in reply togreygoose

Whoops yes ….now edited

SlowDragon profile image
SlowDragonAdministrator

Vitamin D not checked but I’ve taken daily supplement for 3 years.

How much vitamin D are you taking

Test at least yearly when supplementing

Can test via NHS private testing service

vitamindtest.org.uk

Legomami profile image
Legomami in reply toSlowDragon

I’m taking vitabiotics ultra 1000 IU daily, I will arrange a test

SlowDragon profile image
SlowDragonAdministrator in reply toLegomami

Definitely test, 1000iu is not a high dose

SlowDragon profile image
SlowDragonAdministrator

Your TPO antibodies are borderline high

Worth getting an ultrasound scan of thyroid

20% of Hashimoto's patients never have raised antibodies

healthunlocked.com/thyroidu...

Paul Robson on atrophied thyroid - especially if no TPO antibodies

paulrobinsonthyroid.com/cou...

Gluten intolerance is often a hidden issue too.

Request coeliac blood test BEFORE considering trial on strictly gluten free diet

nice.org.uk/guidance/ng20/c...

1.1 Recognition of coeliac disease

1.1.1

Offer serological testing for coeliac disease to:

people with any of the following:

persistent unexplained abdominal or gastrointestinal symptoms

faltering growth

prolonged fatigue

unexpected weight loss

severe or persistent mouth ulcers

unexplained iron, vitamin B12 or folate deficiency

type 1 diabetes, at diagnosis

autoimmune thyroid disease, at diagnosis

irritable bowel syndrome (in adults)

first‑degree relatives of people with coeliac disease.

pennyannie profile image
pennyannie

Hey here again ;

We suggest an early morning and fasting blood test as this generally gives a highest TSH reading - which is what most doctor understand and dose on -

as historically we are under medicated and doses reduced because the TSH is too low .

I believe I answered your previous post and your blood test still stands but the issue more one of getting acknowledgement from the medical profession - unless you choose to go privately and even then you need to be sure before you go, who to see, and that you are not wasting your time and money.

Legomami profile image
Legomami in reply topennyannie

Thank you, I wasn’t doubting your previous response. Just been thrown by speaking to someone who is supposed to be knowledgeable about thyroid and again being told it’s fine.

I’m planning to arrange a virtual appointment with the thyroid clinic in Bristol but was wondering whether to redo bloods before that appt.

SlowDragon profile image
SlowDragonAdministrator

cks.nice.org.uk/topics/anae...

Serum ferritin level is the biochemical test, which most reliably correlates with relative total body iron stores. In all people, a serum ferritin level of less than 30 micrograms/L confirms the diagnosis of iron deficiency.

Never supplement iron without doing full iron panel test for anaemia first and retest 3-4 times a year if self supplementing.

It’s possible to have low ferritin but high iron

Test early morning, only water to drink between waking and test. Avoid high iron rich dinner night before test

Stop iron supplements 5-7 days before testing

Medichecks iron panel test

medichecks.com/products/iro...

Look at increasing iron rich foods in diet

Eating iron rich foods like liver or liver pate once a week plus other red meat, pumpkin seeds and dark chocolate, plus daily orange juice or other vitamin C rich drink can help improve iron absorption

List of iron rich foods

dailyiron.net

Links about iron and ferritin

irondisorders.org/too-littl...

davidg170.sg-host.com/wp-co...

Great in-depth article on low ferritin

oatext.com/iron-deficiency-...

drhedberg.com/ferritin-hypo...

This is interesting because I have noticed that many patients with Hashimoto’s disease and hypothyroidism, start to feel worse when their ferritin drops below 80 and usually there is hair loss when it drops below 50.

healthunlocked.com/thyroidu...

Posts discussing Three Arrows as very effective supplement

Great replies from @FallingInReverse

re ferritin and Three arrows

healthunlocked.com/thyroidu......

healthunlocked.com/thyroidu...

healthunlocked.com/thyroidu...

Great reply by @fallinginreverse

healthunlocked.com/thyroidu...

Iron patches

healthunlocked.com/thyroidu...

Thyroid disease is as much about optimising vitamins as thyroid hormones

healthunlocked.com/thyroidu...

restartmed.com/hypothyroidi...

Post discussing just how long it can take to raise low ferritin

healthunlocked.com/thyroidu...

Iron and thyroid link

healthunlocked.com/thyroidu...

Posts discussing why important to do full iron panel test

healthunlocked.com/thyroidu...

Good iron but low ferritin

healthunlocked.com/thyroidu...

healthunlocked.com/thyroidu...

Chicken livers if iron is good, but ferritin low

healthunlocked.com/thyroidu...

Shellfish and Mussels are excellent source of iron

healthline.com/nutrition/he...

Iron deficiency without anaemia

healthunlocked.com/thyroidu...

Ferritin over 100 to alleviate symptoms

healthunlocked.com/thyroidu...

healthunlocked.com/thyroidu...

Great research article discussing similar…..ferritin over 100 often necessary

ncbi.nlm.nih.gov/pmc/articl...

Low Iron implicated in hypothyroidism

healthunlocked.com/thyroidu...

Legomami profile image
Legomami in reply toSlowDragon

Thank you! GP has tested tTG, I don’t have the result to hand but it was almost 0 if I remember correctly.

Iron is GP prescribed but they only go by ferritin and Hb to monitor it and I’m not sure they’d even do those unless I insisted. I will take time to read those advice posts about increasing it and organising further bloods.

Not what you're looking for?

You may also like...

Does Liothryonine make a difference?

I've been taking levothyroxine my entire life as I was born with a thyroid glad that does not...
Alexs89 profile image

Timing of thyroid blood tests

Hi I am having my 6 monthly thyroid bloods next week at 8.20am Previous ones have been 8.10am Not...
Macey2009 profile image

Help with blood tests

Hi I've just had full blood tests done and i was wondering if anyone could help with analysing...
kateeliza profile image

Timing of Thyroid blood tests

I stupidly took my thyroid meds 3 hours before my bloods ( 150 levo and 20mcg of Liothyronine) -...
cazza1001 profile image

Blood Tests

Hi again. Just to remind you of the story so far - sorry if this is long-winded. I have been...
chickenmitch profile image

Moderation team

See all
PurpleNails profile image
PurpleNailsAdministrator
Jaydee1507 profile image
Jaydee1507Administrator
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.