Which vitamins and supplements should be stopped before getting blood work, laboratory tests, or medical imaging?

I discovered that a glucosamine supplement I was taking was causing alarming liver enzyme test results. Multiple tests, even an endoscopy and biopsy showed no problems. I stopped the glucosamine and test results dropped down to normal. I also found some data about the effect.

Wow, never had been advised about any of this prior 2 any of my lab tests, ever! Thank "U "

Interesting, I'd just found this out on my own after having gone downhill for about 7 years, and with 2 years of worsening heart problems. I've been hypothyroid for many decades and was on a fair dose of a good thyroid medication but suspected my thyroid - so went investigating. What I discovered led me to pay out of pocket for ft3 ,ft4, and tsh labs after being off b vitamins for a week. Past tests had always shown high normal results, when in fact my test graph plummeted well below the whole chart for ft3 and 4 after removing the b vitamins that included biotin. Now, on the correct dose, my heart problems are resolving along with so many other things related to low thyroid. I told many friends who found that their doctors, and even endocrinologists, weren't aware of this! Many were on the wrong dose, it turned out. Anyone with thyroid issues knows how this will impact every facet of their lives. Hopefully the professionals will read this.

Thanks, ConsumerLab!! And this... is why I subscribe.

WoW! Thank you so much for this information! I had no idea. I just had a annual blood test and my thyroid was off. I do take supplements and am retesting in 6 weeks as my php said it was confusing relating to other results. I will also check back on here a month before blood work for additional info. THANK YOU! CONSUMER LAB!

I was advised to stop fish oil, turmeric and vitamin e before a medical procedure because of bleeding risk. Surprised at the number of supplements’ cautions regarding tests and procedures. I now look up all my individual supps. before
Med tests.

does taking collagen powder interfere with bone marker tests, particularly urine tests?

Great information! Thanks

Thank you… Very helpful post.

THANK YOU SOOOO VERY MUCH. I had no idea.

Thank you so much for that helpful info. My Dx’s never told me about any of this!

Don't forget about Red Yeast Rice or other "natural statin" supplements raising liver enzymes.

I had no idea, thanks!

Thanks for this info. I get a full body bone scan every 6 mos. and no one
at facility ever told me not to take calcium before test.

thanks love hearing these kinds of info

This information is very beneficial. Thank you!

This is very helpful. I had no idea. It is an excellent and important reminder, that supplements in any form need to be discussed with your doctor. It is also important as WE must take steps to be informed on anything we ingest before having blood work.

Great

Thanks!

Many thanks

What an excellent review! Thank you Consumer Lab.

Thanks. Very helpful.

As a person who has frequent lab work, I find this very helpful. Thank you.

I recently started taking Biotin to help with my hair. I am hypothyroid and when I took my thyroid blood test the result that came back was off the chart crazy . I had to go to an endocrinologist to find out about Biotin.
She said to discontinue for a week before any future tests, and if I had any visits to the ER always tell them that I take Biotin or the blood test results will make them think I'm having a heart attack.