
05/29/2023
Whenever your doctor requisitions you blood work, be sure to always ask the following questions:
1️⃣ Should I be fasted before completing these labs?
2️⃣ Is there a specific time of day I should get these labs done? (AM/PM/anytime)
3️⃣ Is there a specific time in my menstrual cycle I should be getting these labs done?
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The most common thyroid lab test (TSH), actually follows a circadian rhythm, with peak levels being reached at around 2-4am and the lowest point being in the late afternoon. So in order to avoid missing a diagnosis, the best time to get your thyroid tested is first thing in the morning.
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Same goes for fasting – TSH has been shown to be significantly lower after eating versus in the fasted state. Again, to avoid missing a diagnosis, it’s best to be fasted before completing your labs.
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Unfortunately, Dynacare and Lifelabs can produce different results and have different ranges. Pick one of these labs and stick to it for the most accurate comparison of lab work.
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These are the top 4 general rules for accurately testing your thyroid. However, there may be additional factors/testing procedures to consider depending on what other lab markers are on your requisition (cortisol, reproductive hormones, etc). So be sure to always confirm with your MD or ND how they would like you to complete the blood work 🩸