A TSH test measures the amount of thyroid stimulating hormone (TSH) in your blood. TSH is produced by the pituitary gland and tells the thyroid gland to make and release the hormones thyroxine (T4) and triiodothyronine (T3). See also: 1  T3 test.  T4 test.
Best Answer: Female cats typically have their first heat around the age of six months, which usually lasts for 5 to 7 days. Cat's heat cycles are light dependent and they usually have heat cycles every 9 to 13 days from January through October, though some indoor cats exposed to constant light times will cycle all year. I advise unless you want kittens to keep her in at these times.
The regular heat cycle consists of three parts: 1  Proestrus. Itâs a period of one to two days, in which catâs body is preparing to come in heat. 2  Estrus. Itâs when your cat is responsive to mating and can ovulate and conceive. 3  Interestrus. Itâs when a cat is not in heat, and her body is resting for the next heat cycle.