What is diagnostic tests?

Several types of genetic testing are done for different reasons: Diagnostic testing. If you have symptoms of a disease that may be caused by genetic alterations, genetic testing can reveal if you have the suspected disorder. Examples of disorders for which genetic testing may be used to confirm a diagnosis include adult polycystic kidney disease, iron overload (hemochromatosis) and Charcot-Marie-Tooth disease. Presymptomatic testing. If you have a family history of a genetic condition, undergoing genetic testing before you have symptoms may show if you're at risk of developing that condition. Carrier testing. If you or your partner has a family history of a genetic disorder, such as sickle cell anemia or cystic fibrosis, you may choose to have genetic testing before you have children. Genetic testing can determine if you carry a copy of an altered gene that would put a child at risk of developing the disorder. Prenatal testing. If you are pregnant, tests are available that can detect abnormalities in your fetus's genes. Spina bifida and Down syndrome are two genetic disorders that health care providers often screen for using prenatal genetic testing. Newborn screening. This is the most common type of genetic testing. In many states, it's required that all newborns be tested for gene abnormalities that cause specific conditions, such as congenital hypothyroidism and phenylketonuria. This type of genetic testing is important because if a disorder is found, care and treatment can begin right away.

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Sterile extracts for scratch, prick or puncture testing are supplied in dropper vials containing, in addition to the extract allergens and antigens, 50% (v/v) glycerin as preservative, 0.5% sodium chloride and 0.275% sodium bicarbonate. The strength of these extracts may be expressed in terms of... ... Certain diagnostics carry labeling which states Allergenic Extract for Diagnostic Use Only. Data to support the therapeutic use of products labeled with this statement have not been established. 14 In addition to a carefully taken history, the use of glycerin-containing extracts in scratch, prick or puncture testing is an accepted method in the diagnosis of allergic conditions. 1, 2, 3 Extracts of all allergens do not produce equivalent results in scratch, prick or puncture tests. The intensity of the skin reactions produced will be determined by two factors: the degree of sensitivity of the patient, and the nature of the allergenic extract applied. Scratch, prick or puncture tests are not as sensitive as the intradermal test, but are safer and cause less discomfort. They may, therefore, be the method of choice when a large number of tests are needed, or when testing the pediatric patient. In some cases, where the relatively insensitive scratch, prick or puncture tests are negative or do not confirm the allergic history, follow-up intradermal tests may be positive. However, ANTIGENS PRODUCING LARGE 3 to 4+ SCRATCH, PRICK OR PUNCTURE TESTS SHOULD NOT BE TESTED INTRADERMALLY.

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Diagnostic Tests — The Family Health Guide

Medical Tests: A Practical Guide to Common Tests provides you with information about common screening and diagnostic medical tests so that you can breathe ...

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Diagnostic test - Wikipedia, the free encyclopedia

A diagnostic test is any kind of medical test performed to aid in the diagnosis or detection of disease. For example: to diagnose diseases; to measure the ...

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Digestive Diseases Diagnostic Tests

Patient education fact sheets on six diagnostic tests involving gastrointestinal disorders: colonoscopy, sigmoidoscopy, upper GI series, lower GI series, ...

Screening and Diagnostic Tests: eMedicine Emergency Medicine

Nov 9, 2009 ... Overview: Diagnostic tests help physicians revise disease probability for their patients. All tests should be ordered by the physician to ...

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Diagnostic Tests | Glaucoma Research Foundation

May 1, 2009 ... Diagnostic Tests. Early detection, through regular and complete eye exams, is the key to protecting your vision from damage caused by ...

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Diagnostic Tests

As in the case of the diagnostic tests, treatments should be undertaken only under the supervision of a physician knowledgeable about their use and ...

Neurological Diagnostic Tests and Procedures: National Institute ...

Dec 18, 2009 ... Fact sheet on neurological diagnosis and testing, prepared by the National Institute of Neurological Disorders and Stroke (NINDS).

Read more on www.ninds.nih.gov

Use of Rapid Influenza Diagnostic Tests

Aug 10, 2009 ... This interim guidance provides an overview of the sensitivities of rapid influenza diagnostic tests (RIDT) in detecting novel influenza A ...

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Kidney Stones

Your GP will usually be able to diagnose a kidney stone from your symptoms. However, a number of different diagnostic techniques may be used to help confirm the diagnosis, or to identify precisely where a kidney stone is. These include...

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Allergy testing
Bernstein IL, Li JT, Bernstein DI, Hamilton R, et al. American Academy of Allergy, Asthma and Immunology, American College of Allergy, Asthma and Immunology. Allergy diagnostic testing: an updated practice parameter. Ann Allergy Asthma Immunol. 2008 Mar,100(3 Suppl 3):S1-148.

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Tensilon test
The Tensilon test is a method to help diagnose myasthenia gravis.

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Citric acid urine test
The test is used to diagnose renal tubular acidosis and evaluate kidney stone disease.

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LE cell test
The test is mainly used to diagnose systemic lupus erythematosus (SLE).

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Nitric oxide test
Nitric oxide testing is done to help diagnose asthma or see how well asthma medications are working. If you've already been diagnosed with asthma, your doctor may use a nitric oxide test during office visits to see if your asthma is under control. If the diagnosis of asthma is uncertain, your doctor may use a nitric oxide test to confirm that you have asthma.

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CA 125 test
You may have a CA 125 test for several reasons: To help diagnose cancer. Your doctor may suggest a CA 125 test if it's suspected that you have ovarian, endometrial or fallopian tube cancer. However, a CA 125 test cannot diagnose these diseases. Only a biopsy of tissue can confirm a diagnosis of cancer. Other tests also may be helpful in the evaluation of these cancers, such as a transvaginal or pelvic ultrasound, computerized tomography (CT) or magnetic resonance imaging (MRI)., To monitor cancer treatment. If you've been diagnosed with ovarian, endometrial or fallopian tube cancer, your doctor may recommend a CA 125 test on a regular basis to monitor your condition and treatment., To screen for ovarian cancer if you're at high risk. If you've been identified as being at high risk of developing ovarian cancer due to a family history of the disease or because you have the BRCA1 or BRCA2 gene mutation, your doctor may recommend a CA 125 test as one way to screen for the disease. A CA 125 test isn't accurate enough to use for cancer screening in all women, however, because many other conditions can cause your level of CA 125 to rise.

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Ferritin test
You may have a ferritin test for several reasons: To diagnose a medical condition. Your doctor may suggest a ferritin test if other blood tests have shown that the level of oxygen-carrying protein in your red blood cells (hemoglobin) is low, or if the proportion of red blood cells to the fluid component in your blood (hematocrit) is low. These may indicate that you have iron deficiency anemia. A ferritin test can help confirm that diagnosis. A ferritin test may also be used to help diagnose conditions such as hemochromatosis, liver disease and adult Still's disease, among others. When used to diagnose a medical condition, a ferritin test is often done in conjunction with an iron test and a total iron-binding capacity (TIBC) and transferrin test. These tests provide additional information about how much iron is in your body., To monitor a medical condition. If you've been diagnosed with a disorder that results in too much iron in your body, such as hemochromatosis or hemosiderosis, your doctor may use a ferritin test to monitor your condition and guide treatment.

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Newborn screening tests
Screening tests do not diagnose illnesses. They identify which babies need additional testing to confirm or rule out illnesses. Good screening tests have a low false-negative rate (if the test is normal, the child should be healthy), but may have a high false-positive rate (as many affected children as possible should test positive, even if this means many healthy children also test positive).

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Bone mineral density test
A bone mineral density (BMD) test can help your health care provider confirm a diagnosis of osteoporosis. The test can help in several ways: BMD testing is one of the most accurate ways to assess your bone health. When repeated over time, it can be used to monitor your rate of bone loss. It can detect osteoporosis at its earliest stage, so treatment can begin sooner. If you are being treated for osteoporosis, BMD testing can help your health care provider monitor your response to the treatment.

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CSD skin test
The CSD skin test was once used to help diagnose cat scratch disease. The test is rarely used today and is not recommended. There are better methods, such as antibody detection by the EIA test, available to diagnose cat scratch disease.

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Trichophyton extract for diagnostic skin testing is a sterile solution that is prepared by extracting allergenic source material of equal parts of Trichophyton mentagrophytes and Trichophyton rubrum with an aqueous solution of 0.25% sodium chloride, 0.125% sodium bicarbonate and 50% glycerol v/v. Phenol is added at 0.4% w/v as a preservative. Extract for intradermal administration is diluted with the above solution without glycerol. WEIGHT BY VOLUME (W/V) Weight by volume refers to the weight of raw product added to a measured volume of extraction solution. A 1:500 w/v extract contains 1 gram of source material in 500 mL of solution. The w/v designation refers to concentration rather than potency. Extract labeled w/v has no U.S. Standard of Potency. Intradermal skin tests with Trichophyton extract are indicated for use in persons who are suspected of having Type I hypersensitivity (i.e. allergy) to the fungus.

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