Question: does freezing urine change it's makeup and/or appearance in any way detectable by a lab or the naked eye??

Here's why I ask: just in case I opt to sub at any point, I froze some urine so I could test with the unfreezing process. I had the specimen in an air-tight bottle, then placed that inside a double-ziploc baggie then placed THAT inside a tupperware container for freezing. It was frozen for 2 days.

To unfreeze, I heated water to 100 degrees, then placed the container in the water. This took about 3 times before the temp of the specimen reached 92 degrees.

HOWEVER... after the unfreezing the sample was inconsistent and by that I mean there was some heavy matter (not quite fully liquid looking, but not solid either) floating at the bottom. So, I shook it up and that evened it all out, but after shaking I did notice visible particles that resembled small flakes of fish food floating.

Is that normal or is that something a technician could look at and view as a red flag or even use to fail someone??
hickory Reviewed by hickory on . The effects of freezing urine? Question: does freezing urine change it's makeup and/or appearance in any way detectable by a lab or the naked eye?? Here's why I ask: just in case I opt to sub at any point, I froze some urine so I could test with the unfreezing process. I had the specimen in an air-tight bottle, then placed that inside a double-ziploc baggie then placed THAT inside a tupperware container for freezing. It was frozen for 2 days. To unfreeze, I heated water to 100 degrees, then placed the container Rating: 5