Saliva testing has been used in scientific testing for decades and has been shown to be highly accurate. The World Health Organization (WHO) has used this method of hormone testing in worldwide comparisons of breast cancer among women living in industrialized vs. non-industrialized countries. Many studies in scientific literature have shown a strong correlation between the levels of steroid hormones in the blood stream and the "bioavailable" (free) levels of steroid hormones in saliva.

Laboratory test results for drugs of abuse have indicated a greater than >98% accuracy when used according to the provided directions. See similar questions...

Ketones may be measured in blood and show up approximately 2-4 hours before they will be present in the urine. In addition, with blood ketones your physician is able to get an accurate reading on your level and know when you need medical intervention. See similar questions...

A blood test is more accurate, but it depends on the type you get. Many doctors will order a simple qualitative hCG. It only gives a yes or no answer, but doesn't register your HCG levels. If you are early in your pregnancy, and your levels are low, you may get a false negative. A quantitative blood test will measure the exact amount of hCG present. It will detect even the most minimal level. See similar questions...

From talking with many customers, I have come to the conclusion that it is very accurate. To the extent that you can even determine how serious your overgrowth is by how fast it develops and how much there is. If it develops almost immediately and there is a lot of stuff, you have it worse than someone who has one or two strings or a little cloudiness develop 20 minutes or so later. See similar questions...

Saliva tests measure "free" hormones (2-5% of the hormones in a person's body), which are the hormones that are bioavailable to stimulate receptor cells and carry out the tasks they are designed to perform. In contrast, serum testing generally measures the "total" hormones, which includes those hormones already bound to protein and unavailable for the cells to use. See similar questions...

There is still a lot of controversy regarding the accuracy and validity of the various testing methods available. We encourage our patients to have their levels tested, preferably using saliva analysis, however we still consider blood analysis better than nothing at all even though they might not be 100% accurate. We understand that many doctors are very resistant to order saliva tests and in such cases blood tests will suffice. See similar questions...

We want to test the blood and saliva samples for chemicals like phthalates, hormones, perfluorinated chemicals, metals, pesticides, and possibly other toxins. The importance of having a data bank of these samples is that with emerging technology and advances in science, we may be able to do more tests in the future than we can do now. Having these samples creates the possibility of study in many different areas of breast cancer research. See similar questions...

It is now very accurate but HIV blood test needs repeating. You need to wait at least 3 months for your blood to show positive signs. The period between the showing of HIV positive sign and the blood testing is called the 'WINDOW PERIOD'. In this period transmission of HIV is possible. See similar questions...

Serum is the specimen of choice for cotinine measurement since it is subject neither to bacterial degradation nor sample concentration. Cotinine can also be measured in saliva in concentrations similar to those in serum; however sample collection is cumbersome as is sample extraction. Most cotinine is excreted by the kidneys into the urine, where it is concentrated about 10X higher than it is circulation. This makes it the specimen of choice for determination of passive exposure. See similar questions...

The examination components provide the quantitative values to determine if the applicant/incumbent’s current medical status meets the medical standards. See similar questions...

Saliva testing may be accurate for hormones that circulate in high concentrations, such as progesterone but not all hormones can be accurately assessed using saliva. Since we require extensive blood testing for each consultation, there is no need to collect saliva samples as well. All the hormones we assess are accurately measured using the blood samples. See similar questions...

Trace amounts of nicotine can be detected in blood and urine for several hours, but they should be gone by 48 hours. However, if you are being tested for nicotine, there is a metabolite of nicotine, called cotinine, which can be detected in blood or urine for as long as 7 to 10 days after your last exposure to nicotine. See similar questions...

Yes, blood in the urine is not a normal finding. There may be several reasons for this. Infection should be ruled out first. If you are taking anticoagulant medicine (blood thinners) this may be responsible and your doctor will determine whether or not you need to see a Urology doctor. See similar questions...

A recent clinical trial conducted at Walter Reed Army Medical Center-Washington, D.C., National Navy Medical Center-Bethesda, MD and Navy Medical Center-San Diego, CA concluded that virtual colonoscopy is slightly more accurate than conventional colonoscopy in detecting significant colonic polyps. This study was published in the New England Journal of Medicine in 2003. See similar questions...

Yes, especially if you are going to have surgery to correct the prolapse, bladder testing (called urodynamics) must be done first. The prolapsed portion of your vagina may be pushing on your urethra and preventing urine leakage. If that is the case, having the prolapse corrected can give you a new problem - urinary incontinence. See similar questions...

Biospecimens, like blood and saliva, are windows into the body that help us understand exposure to chemicals. When people are exposed to toxins, depending on how the toxin enters the body, the toxins may get broken down, transported, and excreted or stored. Blood helps us identify chemicals that are being transported in our body, so it allows us to look at current exposures and how the chemicals interact with our body. See similar questions...

We are sorry, but due to confidentiality concerns, we will not give out individual results from the biospecimen tests. Your privacy will be protected throughout the study and after it has ended. For the step-by-step process of where the data and samples will go and how they will be handled, visit our section on privacy and confidentiality. See similar questions...

Blood pressure machines in large stores are okay for screening purposes and are usually fairly accurate, however, if your blood pressure reads high you should have it checked by your physician to be sure of the accuracy. See similar questions...

When instructions are followed, determining fertility through ovulation microscopy has been shown to be 98% accurate. See similar questions...