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Vitamin B1 (Thiamine) deficiency??

I recently had blood work done (non-fasting) for vitamin B1 deficiency. My levels came back as 6. Everywhere I have found it documented says that normal levels are from 8-30 in plasma, but my test says normal levels are from 4-10 and I don't think that is correct. Is my B1 low? I've been having persistent tingling for months now. I'm 22, female, healthy weight and balanced diet. I have paresthesia, fatigue, headaches and digestive upset, all with no explanation..
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1756321 tn?1547095325
Lab result ranges are based on the type of test used. My tingling issues were due to vitamin B12 deficiency. I can highly recommend the sublingual (under the tongue) vitamin B12 spray to try out and see if your symptoms resolve.

Thanks for your answer, however my vitamin b12 is normal. It is my vitamin B1 that is low. It was a plasma test, not a whole blood sample, and every online criteria, even from quest diagnostics, drugs.com, and a few others say that plasma blood levels of vitamin B1 should be between 8-30 units so I was wondering if anyone else knew the standard.
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