I am being referred again to the endo but a different one this time in two weeks as i am struggling to conceive and they want to check if my thyroid is the problem as all other tests are normal. Just wondering what they will do on this appointment, any info would be great?
Low Ft4 suggests possible hypothyroidism....but normally TSH is high when hypothyroid
Possibly looking at early stage autoimmune thyroid disease also called Hashimoto’s
Hashimoto’s frequently starts with transient hyperthyroid results and symptoms before becoming increasingly hypothyroid
Alternatively possible central hypothyroidism
Presumably you are NOT on levothyroxine?
For full Thyroid evaluation you need TSH, FT4 and FT3 plus both TPO and TG thyroid antibodies tested. Also EXTREMELY important to test vitamin D, folate, ferritin and B12
Low vitamin levels are extremely common, especially if you have autoimmune thyroid disease (Hashimoto's) diagnosed by raised Thyroid antibodies
Ask GP to test vitamin levels and thyroid antibodies
Recommended on here that all thyroid blood tests should ideally be done as early as possible in morning and before eating or drinking anything other than water .
This gives highest TSH, lowest FT4 and most consistent results. (Patient to patient tip)
Is this how you do your tests?
Private tests are available as NHS currently rarely tests Ft3 or thyroid antibodies or all relevant vitamins
If TPO or TG thyroid antibodies are high this is usually due to Hashimoto’s (commonly known in UK as autoimmune thyroid disease).
About 90% of all primary hypothyroidism in Uk is due to Hashimoto’s. Low vitamin levels are particularly common with Hashimoto’s. Gluten intolerance is often a hidden issue to.
The following link may be helpful. Some women, when hypo can have miscarriages.
For women, is there any connection between hypothyroidism and infertility?
Answer From Yvonne Butler Tobah, M.D.
There is sometimes a link between hypothyroidism — when you have an underactive thyroid gland — and infertility in women.
With hypothyroidism, your thyroid gland doesn't produce enough of certain important hormones. Low levels of thyroid hormone can interfere with the release of an egg from your ovary (ovulation), which impairs fertility. In addition, some of the underlying causes of hypothyroidism — such as certain autoimmune or pituitary disorders — may impair fertility.
For women, treating hypothyroidism is an important part of any effort to correct infertility. If infertility remains after hypothyroidism has been corrected, other interventions to treat infertility may be needed.
If you have hypothyroidism and hope to become pregnant, work with your doctor to make sure your hypothyroidism is under control. Seek additional help from an infertility specialist if needed.
If you have hypothyroidism and become pregnant, tell your doctor promptly. Close monitoring of your thyroid hormone level during pregnancy can promote normal fetal development and reduce the risk of miscarriage.
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TSH low the rest normal
TSH at 0.02 is this too low?
TSH below low reference level
Low TSH and menstrual cycle 
Feeling fine but TSH is low
