Which test is more sensitive for detecting drugs: a blood test or a urine test?

Drug testing. The key issue for sensitivity is the method of detection, and the physiology of the drug in the body. Many drugs are metabolized or excreted through the urine and thus tend to be concentrated in urine samples that are tested by lateral flow immunoassay. Blood testing by Mass Spec is also highly sensitive but not as widely available.

Related Questions

Is my psychiatrist in the position to demand a blood panel 9? And would the drug appear in urine test or blood test she wrote CBC deff/tsh cmp uds 9

Yes, she can. As a physician like any other, your psychiatrist has responsibilities for monitoring parameters of your health -- like these lab results. It appears she wants to check your basic blood and metabolic panels, plus thyroid stimulating hormone. She has also ordered a urine drug screen (uds). Drugs you're using will show in the latter test. Read more...
Lab work. The doctor ordered CBC with differential (which is blood cells count with count of different cell classes) TSH (which is thyroid stimulating hormone) cmp (which is comprehensive metabolic panel) uds 9 (which is urine drug screen 9-drug panel). All those are routine orders and any psychiatrist would need to know the results to properly assess a patient. There is no reason to suspect of your doctor. Read more...

Is it possible by a blood test or a urine test to determine if I have a dopamine deficiency?

Not aware of any. I am not aware of an available blood or urine test for dopamine deficiency. Please explain why you seek this and perhaps there is another way to address the problem. Read more...
Sure it is.... There are plenty of people who'd love to tell you TO THE NANOGRAM how much dopamine you HAVE in your blood or urine, what you're deficiency is, & how much you need to become normal. BUT- how replacement will impact you's a TOTALLY DIFFERENT QUESTION. I wouldn't spend money getting such tests. They're of no value to the clinician who knows how to treat dopamine deficiency diseases. Read more...

4 days late. 2 bfn (urine test). Is it to early to get a bfp? When is the best time to go for a blood test to get a positive result?

After missed period. Blood test for pregnancy is generally positive one day after a missed period, if the woman is pregnant. For home test it is better to wait 4-5 days after missed period to do the test; use first morning urine and follow the instructions carefully. Read more...

Longest cycle 35 days long. Last AF was 8/2. Today is 9/20 & still no AF. Negative blood test last week & negative urine test today. What's goin on?

Hormonal imbalance. Menstrual irregularities are not uncommon and anovulatory cycle is a common cause. If you miss more than two periods it would be time to see your doctor. If you do not wish to be pregnant, use contraception all the time. You may consider implanted contraceptive or an IUD. Consult this site for more information on this topic. http://www.nichd.nih.gov/health/topics/menstruation/conditioninfo/Pages/causes.aspx Practice safe sex. Get HPV vaccine. Read more...

I had a blood test when I was 8days late and a urine test and it showed negative, I am currently 1 5days late but not tested since I had bloods done?

No need to test. If your blood test was negative at 8 days after a missed period, you not likely to be pregnant. Menstrual irregularities are not uncommon and anovulatory cycle is a common cause. If you miss more than two periods it would be time to see your doctor. If you do not wish to be pregnant, use contraception all the time. You may consider implanted contraceptive or an IUD. Consult this site for more information on this topic. http://www.nichd.nih.gov/health/topics/menstruation/conditioninfo/Pages/causes.aspx Practice safe sex. Get HPV vaccine. Read more...

Why do I have high glucose on my blood test, but not in my urine test?

How high ? Glucose can be reabsorbed by the kidneys until the blood level exceeds about 130 mg/dl. Once the blood glucose exceeds 130 glucose starts "spilling" out in the urine. Blood glucose can therefore be abnormally high, up to about 130 without any evidence of glucose in the urine. Once above that level typically it will show up in the urine as well. Read more...