I have just seen the below on labtestonline.org (there is a .co.uk site also). I think what it says is relevant to many of the side effects mentioned on TUK and other communities! I was just looking at tests for Vit B. I also want to look at Ferritin and B6 to see what it says about them.
Please note what it says at the bottom about length of fasting time for B12 and Folate - it's longer than we suggest here when including FT3/4 and above 2 others in Thyroid blood testing.
At a Glance
Why Get Tested?
To help diagnose one cause of anemia or neuropathy; to evaluate nutritional status in some people; to monitor the effectiveness of treatment for vitamin B12 or folate deficiency
When to Get Tested?
When you have an abnormal complete blood count (CBC) with a blood smear showing large red blood cells (macrocytosis) or abnormal (hypersegmented) neutrophils; when you have symptoms of anemia (weakness, tiredness, pale skin) and/or of neuropathy (tingling or itching sensations, eye twitching, memory loss, altered mental status); when you are being treated for vitamin B12 or folate deficiency
A blood sample drawn from a vein in your arm
Test Preparation Needed?
Fasting for 6-8 hours before sample collection may be required. Certain medicines may affect the test results; your healthcare provider will advise you on which ones to stop taking.