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.
Never-- if they're SPAYED!! Cats, if they aren't spayed, come into heat every few weeks for most or all of the year, depending on climate. In warmer climates, such as the southern U.S., they cycle all year round. A female is IN HEAT for a week to 10 days (or even as long as 2 weeks in some cases), then out for a week to 10 days-- repeating the cycle until she's bred or spayed.