Hi and Welcome.
Please excuse my tardy response. Our site is undergoing some format changes and some how I missed your post. I'm sorry.
How was the UDS preformed? Did they utilize the Gas chromatography-mass spectroscopy (GCMS), which is highly accurate for UDT, and is considered to have a less than 0.5% false-positive rate?
On a UDS using the GC/MS or LC/MS Opiates UDS the metabolite
s of Morphine, may show Hydromorphone if on high dose or chronic Morphine .