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What is a laboratory test?
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A laboratory (lab) test is a procedure in which a health care provider takes a sample of your blood, urine, other bodily fluid, or body tissue to get information about your health. Some lab tests are used to help diagnose, screen, or monitor a specific disease or condition. Other tests provide more general information about your organs and body systems.
Lab tests play an important role in your health care. But they don't provide a complete picture of your health. Your provider will likely include a physical exam, health history, and other tests and procedures to help guide diagnosis and treatment decisions.
Why do I need a lab test?
Lab tests are used in many different ways. Your health care provider may order one or more lab tests to:
- Diagnose or rule out a specific disease or condition
- An HPV test is an example of this type of test. It can show you whether or not you have an HPV infection
- Screen for a disease. A screening test can show if you are at a higher risk for getting a specific disease. It can also find out if you have a disease, even if you have no symptoms.
- A Pap test is a type of screening test for cervical cancer
- Monitor a disease and/or treatment. If you've already been diagnosed with a disease, lab tests can show if your condition is getting better or worse. It can also show if your treatment is working.
- A blood glucose test is a type of test that is used to monitor diabetes and diabetes treatment. It is also sometimes used to diagnose the disease.
- Check your overall health. Lab tests are often included in a routine checkup. Your provider may order tests of various organs and systems to see if there have been changes in your health over time. Testing can help find health problems before symptoms appear.
- A complete blood count is a type of routine test that measures different substances in your blood. It can give your health care provider important information about your overall health and risk for certain diseases.
What do my results mean?
Lab results are often shown as a set of numbers known as a reference range. A reference range may also be called 'normal values.' You may see something like this on your results: 'normal: 77-99mg/dL' (milligrams per deciliter). Reference ranges are based on the normal test results of a large group of healthy people. The range helps show what a typical normal result looks like.
But not everyone is typical. Sometimes, healthy people get results outside the reference range, while people with health problems can have results in the normal range. If your results fall outside the reference range, or if you have symptoms despite a normal result, you will likely need more testing.
Your lab results may also include one of these terms:
- Negative or normal, which means the disease or substance being tested was not found
- Positive or abnormal, which means the disease or substance was found
- Inconclusive or uncertain, which means there wasn't enough information in the results to diagnose or rule out a disease. If you get an inconclusive result, you will probably get more tests.
Tests that measure various organs and systems often give results as reference ranges, while tests that diagnose or rule out diseases often use the terms listed above.
What are false positive and false negative results?
A false positive result means your test shows you have a disease or condition, but you don't actually have it.
A false negative result means your test shows you don't have a disease or condition, but you actually do.
These incorrect results don't happen often, but they are more likely to happen with certain of types tests, or if testing was not done right. Even though false negatives and positives are uncommon, your provider may need to do multiple tests to make sure your diagnosis is correct.
What factors can affect my results?
There are many factors that can affect the accuracy of your test results. These include:
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- Certain foods and drinks
- Medicines
- Stress
- Vigorous exercise
- Variations in lab procedures
- Having an illness
If you have any questions about your lab tests or what your results mean, talk to your health care provider.
References
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- AARP [Internet]. Washington D.C.: AARP; c2015. Your Lab Results Decoded; [cited 2018 Jun 19]; [about 4 screens]. Available from: https://www.aarp.org/health/doctors-hospitals/info-02-2012/understanding-lab-test-results.html
- FDA: U.S. Food and Drug Administration [Internet]. Silver Spring (MD): U.S. Department of Health and Human Services; Tests Used In Clinical Care; [updated 2018 Mar 26; cited 2018 Jun 19]; [about 4 screens]. Available from: https://www.fda.gov/MedicalDevices/ProductsandMedicalProcedures/InVitroDiagnostics/LabTest/default.htm
- Lab Tests Online [Internet]. Washington D.C.: American Association for Clinical Chemistry; c2001–2018. Deciphering Your Lab Report; [updated 2017 Oct 25; cited 2018 Jun 19]; [about 2 screens]. Available from: https://labtestsonline.org/articles/how-to-read-your-laboratory-report
- Lab Tests Online [Internet]. Washington D.C.: American Association for Clinical Chemistry; c2001–2018. Reference Ranges and What They Mean; [updated 2017 Dec 20; cited 2018 Jun 19]; [about 2 screens]. Available from: https://labtestsonline.org/articles/laboratory-test-reference-ranges
- Middlesex Hospital [Internet]. Middletown (CT): Middlesex Hospital c2018. Common Lab Tests; [cited 2018 Jun 19]; [about 4 screens]. Available from: https://middlesexhospital.org/our-services/hospital-services/laboratory-services/common-lab-tests
- National Cancer Institute [Internet]. Bethesda (MD): U.S. Department of Health and Human Services; Understanding Laboratory Tests; [cited 2018 Jun 19]; [about 3 screens]. Available from: https://www.cancer.gov/about-cancer/diagnosis-staging/understanding-lab-tests-fact-sheet#q1
- National Heart, Lung, and Blood Institute [Internet]. Bethesda (MD): U.S. Department of Health and Human Services; Blood Tests; [cited 2018 Jun 19]; [about 3 screens]. Available from: https://www.nhlbi.nih.gov/health-topics/blood-tests
- O'Kane MJ, Lopez B. Explaining laboratory test results to patients: what the clinician needs to know. BMJ [Internet]. 2015 Dec 3 [cited 2018 Jun 19]; 351(h):5552. Available from: https://www.bmj.com/content/351/bmj.h5552
- UW Health [Internet]. Madison (WI): University of Wisconsin Hospitals and Clinics Authority; c2018. Health Information: Understanding Lab Test Results: Results; [updated 2017 Oct 9; cited 2018 Jun 19]; [about 4 screens]. Available from: https://www.uwhealth.org/health/topic/special/understanding-lab-test-results/zp3409.html#zp3412
- UW Health [Internet]. Madison (WI): University of Wisconsin Hospitals and Clinics Authority; c2018. Health Information: Understanding Lab Test Results: Topic Overview; [updated 2017 Oct 9; cited 2018 Jun 19]; [about 2 screens]. Available from: https://www.uwhealth.org/health/topic/special/understanding-lab-test-results/zp3409.html
- UW Health [Internet]. Madison (WI): University of Wisconsin Hospitals and Clinics Authority; c2018. Health Information: Understanding Lab Test Results: Why It Is Done; [updated 2017 Oct 9; cited 2018 Jun 19]; [about 3 screens]. Available from: https://www.uwhealth.org/health/topic/special/understanding-lab-test-results/zp3409.html#zp3415
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Blood Test Range Chart Body Surface Area Calculator Ideal Body Weight Calculator Blood test results have specific meaning to knowledgeable and qualified medical personnel. What is the normal range of each part of my Blood test? What is the normal maximum and normal minimum result in each part of a Blood test? For instance, what id the normal range of uric acid? What is the normal white Blood cell count? Blood test results, made possible by the taking of Blood for laboratory testing, are one of the most important tools that your doctor uses in evaluating your health status. Blood tests are fast and almost painless. It is important to realize that your Blood test result may be outside of what is called the 'normal range' for many reasons. Remember that Blood test results are always best interpreted by a Blood professional or doctor who is familiar with your Blood test history, over time. Blood tests, including various Blood chemistry and hematology 'Blood tests' offered by most test labs, represent an economical way by which quality information about a patient's physical condition, at the time of the Blood testing, can be made available to the physician. These Blood test results, after review and interpretation by a qualified Blood professional, play an important part in an overall diagnosis. Blood test results are important in detecting and diagnosing Blood disorders in Blood tests and a Blood test with Rare Blood types. Blood test results are compared and measured in 'normal ranges' for a given population group and individual. Low cost Blood tests, discount Blood testing and even free Blood tests are available and listed in your local community. Blood Test Results, Blood test.
A large number of laboratory Blood tests are widely available. Many Blood tests are specialized to focus on a particular disease or group of diseases. Many different Blood tests are used commonly in many specialties and in general practice. Discount Blood testing Bloodmobile.Blood Test Results, Blood test. Because most Blood test reference ranges (often referred to as 'normal' ranges of Blood test results) are typically defined as the range of values of the median 95% of the healthy population, it is unlikely that a given Blood sample, even from a healthy patient, will show 'normal' values for every Blood test taken. Therefore, caution should be exercised to prevent overreaction to mild abnormalities without the interpretation of those tests by your examining physician. Again, a Blood test, though important, is only a part of the final diagnosis of a health problem. Often, you can get your Blood tested at the Bloodmobile. Physicians rely on 'Blood-work,' or clinical laboratory diagnostic Blood testing to diagnose medical conditions. From this Blood testing the medical professional then prescribes therapies and remedies, based on those Blood tests. Blood test results reveal Blood disorders in Blood tests and also with a Blood test with Rare Blood types. Good Blood tests make possible state-of-the-art lab procedures that can be provided directly to the public in private and these Blood tests can be provided affordably. Some of the most common Blood test are: Blood Test Results, Blood test, rare Blood types, Blood disorders.
In the next paragraphs we will talk about categories of these Blood tests and the results of your Blood test. Most Blood tests fall within one of two categories: screening or diagnostic. Screening Blood tests are used to try to detect a disease when there is little or no evidence that a person has a suspected disease. For example, measuring cholesterol levels helps to identify one of the risks of heart disease. These screening tests are performed on people who may show no symptoms of heart disease, as a tool for the physician to detect a potentially harmful and evolving condition. In order for screening tests to be the most useful they must be readily available, accurate, inexpensive, pose little risk, and cause little discomfort to the patient. Coupons for DNA and Cancer Blood tests. Iron Rich Foods Information Website Diagnostic Blood tests are utilized when a specific disease is suspected to verify the presence and the severity of that disease, including allergies, HIV, AIDS, Hepatitis, cancer, etc. What is a Blood test? Blood tests are an essential diagnostic tool. Blood is made up of different kinds of cells and contains other compounds, including various salts and certain proteins. Blood tests reveal details about these Blood cells and, Blood compounds, salts and proteins The liquid portion of the tested Blood is plasma. When our Blood clots outside the body, the Blood cells and some of the proteins in Blood turn into a solid. The remaining liquid is called serum, which can be used in chemical tests and in other Blood tests to find out how the immune system fights diseases. Doctors take Blood samples and grow the organisms, found in Blood tests, that cause illness, to evaluate each, microscopically. Discount Blood Test, Blood Typing, Mercury Blood Tests, Positive Blood Type, Iron Rich Foods, Negative Blood Type, How is a Blood test carried performed? Blood samples taken for Blood testing can be taken either from an artery. A few drops of Blood are needed, most of the time. It is often enough to take a small drop from the tip of your finger and then squeeze the Blood out for Blood testing. Most Blood tests are taken from an artery (arteries carry fresh, oxygenated Blood FROM the heart,) most often from those arteries near the elbow. First a tourniquet is tied around the upper arm to make the artery easy to find and take the Blood for the Blood test. The place where the injection is to take place is then made sterile and then a hollow needle is put into the artery. The needle will be attached either to a Blood test sample bottle or to a syringe where the plunger is pulled back to create low negative pressure. When the needed amount of Blood for testing has been removed from the artery, the needle is removed. The area is then re-cleaned and pressure is placed on the area with a small ball of cotton. This is pressed against the area for a couple of minutes before applying a bandage. Blood test results are important in Blood disorders in Blood tests and a Blood test with Rare Blood types. Blood tests are relatively painless. Platelet testing is a Blood test that is often used by doctors. First lets define platelets. Platelets are very small cells in the Blood. These clump together at places where injury to Blood vessels occur. They are the basis of the Blood clot that normally forms when the skin is broken. A Blood test revealing a low platelet count can make us vulnerable to bleeding, sometimes even without an injury that we see. Some of the causes of a low Blood platelet count include autoimmune diseases, where the effected individual produces an antibody to his or her own platelets, chemotherapy, leukemia, viral infections and some medicines. High numbers of platelets make an individual more vulnerable to Blood clotting. High Blood platelet counts are always found where a condition involving bone marrow such as leukemia, cancer and other Blood borne conditions that are revealed by Blood test results.
No Blood test is completely accurate all of the time. Sometimes a test result is incorrectly abnormal in a person who does not have the suspected disease (a false-positive result). Sometimes a test result is incorrectly normal in a person who has the disease (a false-negative result). Tests are rated in terms of their sensitivity (the probability that their Blood testing results will be positive when a disease is present) and their specificity (the probability that their test results will be negative when a disease is not present). A very sensitive test is unlikely to miss the disease in people who have it, however, it may falsely indicate disease in healthy people. Blood test results are important in Blood disorders in Blood tests and a Blood test with Rare Blood types. A very specific test is unlikely to indicate disease in healthy people. Although, it may miss the disease in some who have it. Problems with sensitivity and specificity can be largely overcome by using several different Blood tests. Because your physician can not always be sure whether or not the reported result of a particular test from a particular person is false or true, a person with an abnormal result may often need to be re-tested or undergo a different type of testing. Links to Free Blood tests and Free Blood testing click here. Normal test result values are expressed as a reference range, which is based on the average values in a healthy population; 95% of healthy people have values within this range. These values vary somewhat among laboratories, due to methodology and even geography. Blood tests and Blood testing methods and quality vary widely in different parts of the world and in different parts of many countries, due to characteristics in the population, both racial Blood differences and ethnic Blood characteristics, among other factors. Free Cord Blood testing at the Bloodmobile. American Blood laboratories use a different version of the metric system than does most of the rest of the world, which uses the Systeme Internationale (SI). In some cases translation between the two systems is easy, but the difference between the two is most pronounced in the measurement of chemical concentration. The American system generally uses mass per unit volume, while SI uses moles per unit volume. Since mass per mole varies with the molecular weight of the substance being analyzed, conversion between American and SI units requires many different conversion factors. Keep in mind that there are three Blood test 'normal ranges.'
VISIT THE BLOODMOBILE :: NATIONAL BLOOD REPORT :: FLORIDA BLOOD CENTER LINKS :: SELLING SPERM The following Blood Test Reference Range Chart is presented in the 'American Metric' format (exceptions as noted.) View Measurements section HERE.
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