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The information on Stop The Thyroid Madness is excellent for saliva testing and what we share is generally very consistent with this information.
This is the page about saliva testing on STTM: https://stopthethyroidmadness.com/saliva-testing/
Summary:

Patients in the UK say that Medichecks isn’t perfect for their needs, but have said they usually get enough info to make it worthwhile, but it’s up to you.
As of 5/2020 patient are reporting that Genova is coming back with many high to VERY high results on MOST tests for MOST persons. People are saying this doesn’t make sense compared to their history and symptoms. Up to you to decide if this works and make sense for your situation, this is simply a report of what people have told us in their opinion about their results.
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This page is good to study before testing:
Supplements and Meds Influencing Your Cortisol Saliva Results
https://www.stopthethyroidmadness.com/supplements-and-meds-which-affect-adrenals/
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Patient also report:

Patients report optimal test times (modify is schedule is atypical):
Within 1/2 hour of waking, noon, 4-5 and bedtime.
Labs often seem to suggest no food 2 hours prior to samples.
Patients report:
No caffeine the day of or day before the saliva test (wean to avoid headaches)
Test on as normal of a day as possible (no fights or added stress)
No exercise on test day.
No lip products the day of testing.
Nothing in mouth 1/2 hour before each sample
Thyroid meds taken as normal (Adjusted to not have anything in mouth 1/2 hour prior to each sample)
Tips:
IT IS STRONGLY SUGGESTED TO MAKE SURE TO SEND SAMPLES DIRECTLY TO THE LAB LOCATION AND MAKE SURE NOT TO USE A P.O. BOX OR SIMILAR.
For support from your fellow patients, please join Adrenal Fatigue and Thyroid Care by clicking here.
Order Here

(links are below)
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For those that prefer to order from amazon, here is the link. (it is slightly more costly than other options, but some prefer amazon):
For California and most other states if the Amazon link is out of stock, please check these sites:
Canary club: https://www.canaryclub.org/home-diagnostic-tests/focused-test-profiles/focused-tests/cortisol-4x-stress-profile
Testing VIA BLT – All states that allow self-testing:
Canada Testing:
Many are using ZRT or Rocky Mountain.
My MedLab ships to Canada. Can use this number and tell them you saw this via STTM: 417-782-6169
Australia testing:
United Kingdom
https://medichecks.com/products/stress-cortisol-saliva-tests-4
Comprehensive Adrenal Stress Test.
This test also measures levels of Secretory IgA an important marker for immune function and helps to show how stress may be impacting on immune function.
Saliva testing WITH Sex Hormones:
(Note: Some patients report feeling blood testing for sex hormones is more accurate, others report that saliva has been fine for them) This kit is for sex hormones and cortisol:
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