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.
Rating Newest Oldest. Best Answer: You can spay a cat at 6 weeks, in fact it is much easier on them the earlier you do it. Cats can come into heat on different schedules, many go into heat for a couple weeks every 3-6 months, but it varies greatly. My cat would come into heat every 2 weeks, for a week.