Other causes include: 1  A fall against a hard surface in the seated position, such as a fall from a horse. 2  A direct blow to the coccyx, such as in contact sports.  Straining or dislocating the coccyx. This can happen due to poor posture while driving, or repetitive injury from sports such as rowing or cycling.
1 Positive test results also can mean that the amount of a substance being tested for is higher or lower than normal. 2  A negative test result means that the substance or condition being tested for was not found. false-negative test result may suggest that a person does not have a disease or condition being tested for when he or she does have it. For example, a false-negative pregnancy test result would be one that does not detect the substance that confirms pregnancy, when the woman really is pregnant.
Secs New Member. For urine specimens, negative drug tests turn-around time is only about 24 hours. Positive drug test turn-around time is roughly 3-5 days. Just because the information is available to the employer from the lab, that doesn't mean the employer will actually retrieve the info in 24 hours.or urine specimens, negative drug tests turn-around time is only about 24 hours. Positive drug test turn-around time is roughly 3-5 days.