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.



Dr. Alison McAllister

Alison McAllister, ND is the Clinical Consultant Manager at ZRT Laboratory.
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Recent Posts

Menstrual Cycle Mapping – Your Questions Answered

Posted by Dr. Alison McAllister on Friday, 02 February

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ZRT has launched a month-long hormone assessment in dried urine called the Menstrual Cycle Mapping test. This is what some call the 28-day hormone test. In our profile, we test estrogen, progesterone, and LH levels throughout a month. 

This article tackles some frequent questions providers might have regarding the purpose of the testing and who the ideal patient is.

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Hormones, the Menstrual Cycle & Cycle Maps

Posted by Dr. Alison McAllister on Thursday, 14 December

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The menstrual cycle is a symphony of hormones coordinated to yield an egg and to prepare the uterus and breast tissue for pregnancy. For most women, pregnancy will only take place in a very small percentage of cycles.

However, the monthly surge and fall of hormones starting in menarche and ending in menopause influences the brain, breast and uterus of women and may result in numerous symptoms throughout the month.

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Keeping Your Child Safe From Toxic Baby Food

Posted by Dr. Alison McAllister on Friday, 10 November

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Is there anything more endearing than the photographs of your baby eating his or her first foods? Their faces squish-up, they are covered from head to toe, their tongues protrude to catch every bite or more often to try to get the revolting taste out of their mouths.

Now, we parents are the ones squishing up our faces and showing huge grimaces of disgust at the latest report that our baby food is contaminated by metals – arsenic, lead, cadmium – none of it monitored or regulated by the FDA.

The non-profit Clean Label Project independently analyzed 500 baby formulas and prepared baby foods (formula, food, pouches, snacks, drinks, cereals) from 60 companies and found the following horrifying information. 

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Cortisol Patterns For Graveyard (Shift) Workers

Posted by Dr. Alison McAllister on Tuesday, 31 October

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If you come by ZRT on Halloween you’re likely to be greeted by a witch, vampire, zombie or other nightcrawler. We take our decorations and dressing up seriously around here, and finding people in costume processing your labs or taking your calls is par for the course.

Laughing aside (and let me tell you, some costumes are hilarious) those who live their lives by night – on the graveyard shift – can really struggle.

Two primary challenges for people who work at night are energy and fatigue. This is largely due to the pineal gland and its interaction with light that triggers and enforces our body’s pre-programmed circadian rhythm – which produces high cortisol in the morning and then drops throughout the day until the lowest value at night. For those who work graveyard shift that normal circadian rhythm must be re-established, and for many people it doesn’t happen.

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