In the peri menopause, the hormone levels may change on a daily basis, so blood rests are not accurate or reliable. Hysterectomy, without removal of ovaries, does not interfere with hormone levels in the blood. My GP told me I'm not menopausal until I've had a hot flush. I have shown other symptoms of menopause. Nor all women will experience hot flushes.
Some women have no symptoms of oestrogen deficiency.
However, other factors such as bone density and cardiovascular risks may be relevant. Thrombosis is a blood clot that occurs in either a vein or an artery. HR T is not recommended if you have had a thrombosis or no obvious reason. You may be asked to have a blood test to check for any blood-clotting problem. People with a clotting predisposition may take blood-thinning tablets and are then able to use HRT if necessary.