Is blood test better than urine?

Blood test results are about 99 per cent accurate and can detect lower amounts of hCG than urine pregnancy tests. The 2 main types of blood pregnancy test include: Quantitative blood test – measures the exact amount of hCG in the blood and can give you an estimate of how far along the pregnancy has progressed.

Are lab urine tests more accurate?

What about accuracy? Lab-based drug tests are more accurate. We like to say they are more rigorous, more involved, and more defensible in a court of law, all of which are elements certain organizations must consider, particularly heavily regulated industries, like the DOT.

Are blood and urine tests the same?

Unlike urine samples, blood samples generally detect alcohol and drug compounds themselves rather than their metabolites.

Can you have negative urine test but positive blood test?

Blood Pregnancy Test Accuracy As with home urine tests, it is possible (although rare) to end up with false results (both negative and positive) from a blood pregnancy test.

Can lab drug test be wrong?

A worry for anyone undergoing an illicit drug screen – whether it be a urine, hair, saliva or blood test – is the possibility of a false positive drug test. In fact, some data suggests 5 to 10 percent of all drug tests may result in false positives and 10 to 15 percent may yield false negatives.

What is the difference between a home drug test and a lab drug test?

A typical Immunoassay test. In the home drug test the reagent uses a control and detection line as a signal. In a lab performed immunoassay the signal can be a number of things. The most common is linking a chemical that changes color when the reaction takes place.

Can you trust at-home drug test?

No drug test of this type is 100% accurate. There are several factors that can make the test results negative even though the person is abusing drugs. First, you may have tested for the wrong drugs. Or, you may not have tested the urine when it contained drugs.

What is the best sample specimen for drug testing and why?

Drug testing in biological specimens is the most common way to prove and deter drug abuse. Urine is the most widely used matrix for drugs of abuse testing. The advantages of urine specimen include that it is well known specimen, drugs concentrate in the urine and analytically it is an easy sample to work with.