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Add a report from your GP, the NHS App or a clinic, and see your results, medicine and how you feel over time. We explain each level in plain words, read against the lab’s own range. Members watch these films in the app, beside their own results.
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The film in words
Your results may include ferritin and iron, vitamin B12, folate and vitamin D.
The thyroid needs iron to make T4 and T3, and low iron is often found with an underactive thyroid, especially in pregnancy.
Iron tablets can stop levothyroxine being absorbed, so doctors recommend taking them four hours apart. Some multivitamins contain iron.
Vitamin B12 helps make red blood cells and keeps the nervous system healthy. Guidance for doctors lists autoimmune conditions, such as thyroid disease, as a risk for low B12.
Vitamin D is needed for healthy bones, teeth and muscles. In autumn and winter, when UK sunlight isn’t strong, the NHS advises everyone over 5 to take 10 micrograms a day.
Guidance for doctors is to offer a coeliac disease test when autoimmune thyroid disease is diagnosed, and when low iron, B12 or folate has no clear cause.
Avoid high doses of vitamins or supplements, unless your doctor advises them.
Sources: British Thyroid Foundation: diets and supplements; NICE NG239; NICE NG20
More films
How your thyroid worksThe gland, its two hormones, and the signal from the brain that runs it.1 min 15
What your blood test showsWhat a usual test looks at, TSH and free T4 side by side, and lab ranges.1 min 31
Hashimoto’s: why the thyroid slows downThe immune system, TPO antibodies, and why the test isn’t repeated.1 min 04
Levothyroxine, and how to take itWhat it does, taking it so it’s absorbed, missed doses, and why changes take time.1 min 41
Still not feeling right?When results are in range but symptoms aren’t, and what to ask your GP.1 min 16
Basic and full thyroid testsWhat TSH, free T4, free T3 and the two antibodies each add.1 min 33
Lab ranges and your reportThe units on a report, typical ranges as a guide, age, and antibody cut-offs.1 min 17
TPO antibodies, in detailWhat a positive result can mean, with or without a thyroid problem, and why it stays.1 min 11
Tg antibodies, in detailThyroglobulin, why it’s watched after thyroid cancer, and what its antibodies change.58 sec
Pregnancy and your thyroidPlanning a pregnancy, the dose and tests in pregnancy, and after the birth.1 min 33
General information, not a diagnosis. Your GP can tell you what your results mean for you.