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Why would my (95yr old) mothers urine test not show her use…

Customer Question
Why would my (95yr...

Why would my (95yr old) mothers urine test not show her use of a fentyl patch?

Doctor's Assistant: Have you seen a doctor about this yet? What medications are you taking?

This was dr ordered. She uses oxycodone and a Fentyl patch. She has been using the patch exactly as prescribed but it did not show in her urinne test.

Doctor's Assistant: Anything else in your medical history you think the doctor should know?

He has been treating her since she came to live with my husband and me about 4 years. He prescribes all of her meds. There is no reason why the fentyl did not show in her urine. Now he wants to stop giving it to her. I personally put it on her and change it every 3 days.

Doctor's Assistant: What medications do you take daily? Are you allergic to any medications?

Amlodipine, levothroxin,glipizide, isorb, oxybutin, metoprolol, pota chloride, stool softner, butanimide

Submitted: 10 months ago.Category: Pharmacy
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Answered in 23 minutes by:
10/5/2017
Pharmacist: Dr. C. Rollins, Pharm. D. replied 10 months ago
Dr. C. Rollins
Dr. C. Rollins, Pharm. D.
Category: Pharmacy
Satisfied Customers: 1,108
Experience: Knowledge in hormone replacement therapy, pediatrics, compounding, long term care, retail, hospice, etc.
Verified

It depends what type of test was used

Gas chromatography/mass spectrometry tests will not have false negatives.

Enzyme linked immunoassay – EIA test may have false negatives.

You could ask the lab what test they ran.

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Customer reply replied 10 months ago
Ok
Pharmacist: Dr. C. Rollins, Pharm. D. replied 10 months ago
Hopefully this will help once satisfied with my please rate your satisfaction thanks
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