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How Long Does A Hair Follicle Test Go Back?

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Posted on Tue, 22 Nov 2016
Question: Hello

I just had a hair test today..I noticed when they collected my hair it was put in an envelope with foil with a ruler...I noticed the ruler went up to 10cm is the whole 10cm tested or just 1.5 inches the lady told me the test went back approx 90 days.....
doctor
Answered by Dr. Indu Kumar (3 hours later)
Brief Answer:
Whole hair is tested under the microscope.

Detailed Answer:
Hello,
Thanks for writing to HCM,
I've gone through your query and understand your concern,

Whole hair is tested under the microscope.Hair is observed under the microscope.
It can detect toxic deposition more than three months.

Pattern and nature of deposition is seen for diagnosis.

Get well soon.

Hope I have answered your query.
Further queries are most welcome.

Take Care
Dr. Indu XXXXXXX
Note: For more detailed guidance, please consult an Internal Medicine Specialist, with your latest reports. Click here..

Above answer was peer-reviewed by : Dr. Nagamani Ng
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Answered by
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Dr. Indu Kumar

Radiologist

Practicing since :2004

Answered : 6729 Questions

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How Long Does A Hair Follicle Test Go Back?

Brief Answer: Whole hair is tested under the microscope. Detailed Answer: Hello, Thanks for writing to HCM, I've gone through your query and understand your concern, Whole hair is tested under the microscope.Hair is observed under the microscope. It can detect toxic deposition more than three months. Pattern and nature of deposition is seen for diagnosis. Get well soon. Hope I have answered your query. Further queries are most welcome. Take Care Dr. Indu XXXXXXX