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What else can I help you with?
How long should you incubate water samples?
Water samples should typically be incubated for 5 days at 20-22°C (68-72°F) when measuring biochemical oxygen demand (BOD), which is a standard practice for assessing organic matter levels. For coliform testing, samples are usually incubated for 24 hours at 35°C (95°F). The specific incubation time may vary depending on the type of analysis being performed, so it's important to follow the guidelines relevant to the test in question.
How long is urine sterile for after it leaves the body?
Urine is typically sterile when it exits the body, but it can become contaminated with bacteria from the skin or external environment within a few minutes to an hour.
How long can hair taken five years be used in DNA?
Hair can be used for DNA testing up to several years after it has been shed or collected. The actual time frame can vary depending on storage conditions and the presence of any environmental factors that could degrade the DNA. Ideally, hair samples should be stored in a cool, dry place to help preserve the DNA.
What will be the reaction of urine in a polyethylene tank?
Urine stored in a polyethylene tank will not react with the tank material, as polyethylene is a non-reactive plastic. However, if the urine is left for a long time without proper cleaning, it may develop odors or bacterial growth. Regular cleaning and maintenance are important to prevent these issues.
What are scientists trying to understand about the climate of Earth by analyzing these ice samples?
The Gasses trapped in the air bubbles of the ice in the different levels can tell them what the atmosphere was like when the ice was formed, each layer of ice represents an different year or group of years, it has been there a very long time and provides a timeline of the earths climate changes to help predict what we are going to see in the future. It takes a lot of samples to get a complete picture. Sometimes there wont be a good sample in a particular core for a given time period so multiple cores are needed.
How long is a urine sample good for if frozen?
It's not good anymore for testing once cold, it has to be fresh warm urine for the test to work properly.
How long does urine stay good for testing?
Urine, when stored in an air tight container, free from contamination and help under constant specified temperature can be used for drug testing over a lengthy time period. Frozen urine can be kept indefinitely for testing.
How long can urine be frozen for accurate testing purposes?
Urine can be frozen for accurate testing purposes for up to 6 months.
How long can urine sit out before testing it?
30 minutes
How long can a urine sample be held for testing before it is no good?
Urine samples can typically be stored at room temperature for up to 2 hours before they start to degrade. However, for more accurate results, it is best to refrigerate the sample and test it within 24 hours. After that time, the sample may no longer provide accurate test results.
How long can labs keep urine before testing?
More than likely, if it was positive when given, it will stay positive even after 4 weeks. I am not sure how long the lab keeps your urine, but most don't take that long before testing.
Does alcohol show up in urine test?
Yes... as long as they are testing for it.
How long can a urine specimen be used for alcohol testing?
72 hours, i believe
How long is Fentanyl detectable in urine and blood drug testing?
40 days
How long does frozen urine last before it becomes unusable for testing or analysis?
Frozen urine can typically be stored for up to 6 months before it becomes unusable for testing or analysis.
How long is urine good for drug testing unrefrigerated?
It can't. To be valid urination occurs at the testing facility so that it can't be faked or someone else's substituted.
How long is urine good for urine test?
one day.
