Doctor insights on:
How Reliable Are Fingerstick Blood Tests
How reliable are blood tests that look for monoclonal gammopathy in elevated ImM levels ? Are false negatives possible?
Is immunicap testing reliable for allergy in kids with severe excema?
He already did skin prick and blood tests for specific allergies
Helps some: All allergy related tests have benefits & limitations. Any finding of an elevated IgE response to a particular food is worrisome and worthy of excluding that food. Elevated IgG levels to foods do not always correlate with the kids actual responses to that food. This or other tests can provide a guide to your food selections so you can eliminate candidate foods & see if it makes a difference. ...Read moreSee 2 more doctor answers
Are blood tests for allergy/IgE levels to foods considered reliable? Paranoid over certain foods and want to put fears to rest and liberalize my diet.
False positives: If the result of either the Allergy skin test or specific IgE test is negative then it's very reliable. Positive results on the other hand are only accurate 40-60% of the time so would need to be matched with specific allergy symptoms upon eating the food in question. Screening for a bunch of foods without a thorough history is therefore frowned upon. Testing for Celiac somewhat different. ...Read more
Pancreatitis: Typical tests done include amylase and lipase. Amylase can be elevated due to other problems, so lipase is more specific. Any elevation indicates a problem. Lab values are specific to the lab used. Severe pancreatitis can elevate the lipase into the 1000's. Even a small elevation above normal can cause severe pain. ...Read more
Depends: Depending on what kind of blood tests are being done, you may need to fast. If you are having a metabolic panel, liver panel or cholesterol panel you will need to fast. Probably would be best if you check with your ordering physician to make sure that you understand what you need to do. This will make you avoid potentially abnormal results or the need for a repeat test later. ...Read more
It depends: What is your idea of "accurate"? The lab test results need to be interpreted in the context of the clinical condition. Different tests have different sensitivity, specificity and predictive values. These characteristic vary with the population under consideration, e.g., the HIV screening tests have different performance when used on drug addicts vs. Observant nuns. ...Read more
Depends: It is usually urine that is tested for drugs of abuse. Different drug have different elimination times and it also depends on the chronicity of use. In general cocaine has the fastest elimination and THC (cannabis) the longest. In a chronic user THC may be positive for month after last use. ...Read more
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