The ZRT Laboratory Blog

The ZRT Blog is an extensive resource for patients and health care providers searching for health and hormone testing information. Here, you can read about ZRT’s cutting edge research, advances in testing, wellness advice, and health industry highlights.

The Fertility Screening Tool You May Not Know About

Posted by Dr. Alison McAllister on Thursday, 09 April


Infertility is a heart breaking condition that affects millions of people around the world or approximately 8-12% of couples. When a couple has been trying over a year (under the age of 35) or over 6 months (over the age of 35) screening for hormonal causes is one of the first recommended steps. This is because sometimes simple adjustments to thyroid and/or progesterone can result in fertility.

Read More

Struggling With Infertility: Hormones Tested in the ZRT Fertility Profile

Posted by Dr. Alison McAllister on Monday, 04 February

infertility_zrt_profile_2.4.13-821943-edited.jpgThis blog explains what hormones are tested in ZRT's Fertility Profile and why each one is important.

LH & FSH are pituitary hormones, which means they affect the brain. Their communication with growing egg follicles in the ovaries is one of the only positive feedback loops in the body. On day three or four of the menstrual cycle (day one is the first day of the period) LH & FSH are at their lowest level. This relationship is normally a 1 to 1 function, but some women have LH levels that are two or three times greater than their FSH levels on day three or four of their cycle. This is a sign of polycystic ovarian syndrome (PCOS) and occurs in approximately 50% of PCOS women. The opposite problem can also occur - high FSH and LH levels.

Read More