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Doctor insights on: Makes Metanephrine Test

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What makes the plasma metanephrine test different? 

What makes the plasma metanephrine test different? 

Different from urine: The plasma test compared to the urine is newer and more sensitive. In other words if you have pheochromocytoma the plasma test is less likely to miss the diagnosis by coming back normal. ...Read more

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Dr. Clarence Grim
51 doctors shared insights

Metanephrines (Definition)

Metanephrins are metabolic products of cathecolamines: epinephrin and norepinephrin and can be used to diagnose excess production of these adrenal/sympathetic hormones. They can be measured in blood and urine and are very elevated in a condition called pheochromocytoma which is a tumor found mostly in the adrenal glands ...Read more


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What is the ssa/Ssb blot test antibody blood test?

What is the ssa/Ssb blot test antibody blood test?

A test: for a certain autoimmune condition. it's important to understand that these blood tests need to be interpreted carefully in the context of your symptoms and exam findings. a positive test doesn't necessarily mean you have the condition. ...Read more

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Renin , aldosterone , metanephrine and normetanephrine tests tells you what?

Renin , aldosterone , metanephrine and normetanephrine tests tells you what?

BP cause tests aldo: If they are high or low. Usually done looking for cause of high blood pressure or low blood pressure. Renin if low means Aldo or salt intake too high. If high suspect renal artery stenosis. Meta and nors are to test if you have a pheochromocytoma or other fatal tumor (if Dx missed) causing high BP. They can mean you are pregnant if both R and A high. If mets low may have SNS dysfunction ...Read more

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What is c-peptide assay test in diabetes?

What is c-peptide assay test in diabetes?

Measures insulin: The c-peptide is a by-product molecule that the pancreas makes when producing the Insulin hormone. Clinicians use this blood test measure to determine the Insulin production capacity from the pancreas, and to distinguish from Insulin injected as medication (since Insulin rx does not contain c-peptide). The Insulin assay test itself is also less preferable, due to variations in measurements. ...Read more

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Saliva cortisol tests are abnormally low. Serum cortisol tests are normal. Dr says i don't need an acth stim test due to serum results. Agree?

Saliva cortisol tests are abnormally low. Serum cortisol tests are normal. Dr says i don't need an acth stim test due to serum results. Agree?

Yes: If your saliva cortisol tests are low, then you have adrenal insufficiency. Acth stim test will only help determine if the cause is in the adrenal glands, pituitary gland or hypothalamus. Without other hormonal abnormalities or abnormal levels of sodium or potassium, this test is generally not needed and treatment for the adrenal insufficiency can be done. ...Read more

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My metanephrine free urine was 51, blood test was 63, normetanephrine free urine 181, blood test 150- total urine 232, blood test 213. Normal?

My metanephrine free urine was 51, blood test was 63, normetanephrine free urine 181, blood test 150- total urine 232, blood test 213. Normal?

Sounds normal if....: the upper limits for blood metanephrine and normetanephrine are 0.50nm/l and 0.90nm/l. Urinary levels are, respectively: Total 24 hr. metanephrine =1.3mg for urine; and total plasma ME+NME is less than 205pg/ml. It sound as though you're within the normal ranges, but depending on the units of measure, which vary from lab to lab and med ctr to med ctr., you may not. Meet w/ your endocrinologist. ...Read more

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

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. ...Read more

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Which test is more reliable for monitoring diabetes: a blood sugar test or urine sugar test?

Which test is more reliable for monitoring diabetes: a blood sugar test or urine sugar test?

Bllod sugar: Glucose appears in urine only when blood sugar is greater than (debate) 180-220. Would like to aim for sugars 80-150 for good control. So can still be in 150-180 range, chronically, and still be in less than ideal control without any sugar appearing in urine. ...Read more

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What does quantitative igg subclass measurement blood test show?

IgG subclasses: There are several classes of immunoglobulins like IgA, IgM, and IgE. IgG also has subclasses that we test for. A subclass deficiency can be an explanation for susceptibility to certain types of infections. An Allergist/Immunologist can put the results in perspective for you in the context of your history. ...Read more

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Have GTT test. Blood glucose normal. O hour and 1 hour urine glucose negative but 2 hour urine glucose is trace. False positive or renal glycosuria?

Have GTT test. Blood glucose normal. O hour and 1 hour urine glucose negative but 2 hour urine glucose is trace. False positive or renal glycosuria?

Urine glucose: If your GTT is OK and the 2 hour urine only a trace high, I don't think you have anything to worry about. That said, be careful with your food and drink intake. ...Read more

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Is Haptoglobin (mg/dl) test a blood chemistry test or hematological test?

Is Haptoglobin (mg/dl) test a blood chemistry test or hematological test?

Haptpglobin: Is a transport protein for the breakdown of hemoglobin. If is used to assess for RBC destruction. When the haptoglobin Is low there is an association with increased hemolysis ...Read more

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What level of THC does labcorb test for in a urine drug test?

What level of THC does labcorb test for in a urine drug test?

Not sure, but: I'm not sure the exact level, but i can tell you that the best way to pass the test is to not have thc in your system. Also remember that the labcorp test not only checks for thc, but also for metabolites of thc. So, almost any in your system and it's hard to pass the test. ...Read more

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Why are blood pregnancy tests more accurate and detects sooner than urine tests?

Why are blood pregnancy tests more accurate and detects sooner than urine tests?

Because : Blood is more sensitive, blood detects down to 2-5 miu HCG urine can go down to about 25-30 miu and urine can be influenced by the concentration of the urine. ...Read more

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What does an ipep blood test detect?

Please spell it out: It would help if you could describe the test you have in mind.. If your doctor ordered the test, it would be prudent to ask her/him. ...Read more

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Whats the test using chromogranin a?

Whats the test using chromogranin a?

Tumor marker: It is a test for neuro-endocrine tumors. See this site for more info. http://www.mayomedicallaboratories.com/test-catalog/Clinical+and+Interpretive/34641 ...Read more

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Blood test shows cortisol 1.29 microgr. What does it mean?

Blood test shows cortisol 1.29 microgr. What does it mean?

Can't tell: Hormones including cortisol are secreted in a pulsatile fashion depending on a variety of internal and external stimuli. Only the doc who ordered this test can understand its implications. ...Read more

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If normetanephrine free & metanephrine free are abnormal, will the metanephrine,fractionated blood test be as well?

If normetanephrine free & metanephrine free are abnormal, will the metanephrine,fractionated blood test be as well?

No, can be different: Metanephrines are metabolites of norepinephrine and epinephrine (formerly known as nor-adrenalin and adrenalin). Metanephrines and their parent chemical are made and released into blood, have their actions on receptors, and are then removed very quickly, from blood. Thus they can be strongly positive in urine and negative in blood. They can be highly elevated in adrenal tumors. ...Read more