Any test can be a false negative.
yes.
If a pheochromocytoma is suspected, urine and/or a blood test are usually recommended. A test called "24-hour urinary catacholamines and metanephrines" will be done.
no
As they are strong drugs it can affect the pregnancy test.
Urinating within hours of the urine or swab test, not using the first urine that comes out, or inadequate swabbing can all cause a false negative chlamydia test. In addition, testing too soon after exposure, or recent exposure to partially effective antibiotics could cause a negative test that would be positive within a couple of more weeks.
If a pheochromocytoma is suspected, urine and/or a blood test are usually recommended. A test called "24-hour urinary catacholamines and metanephrines" will be done.
No; Lipitor is not a psychoactive drug and would not cause a false urine test for amphetamines.
No. But the result may be fainter. Do another test.
Promethazine (Phenagren) can cause a false negative.
Mixing water with urine will dilute the urine sample, potentially affecting the accuracy of the urine test results. The concentration of substances in the urine, such as drugs or metabolites, may be lower than expected, leading to false-negative results. Dilution of the urine sample is generally considered an attempt to cheat or manipulate the test.
Diluting urine for a Jaffe's reaction test helps to minimize interference from other substances in urine that may give false-positive or false-negative results. The dilution helps to ensure that the color change observed in the reaction is due specifically to the creatinine concentration in the sample.
Hi, It is possible yes.