CMV rapid culture
What is this test?
This test is used for a quick detection of a virus called cytomegalovirus (CMV). A sample of urine or a sample of saliva may be collected for this test. This test is used when CMV infection is suspected.
What are other names for this test?
- Cytomegalovirus rapid culture
Why do I need this test?
Laboratory tests may be done for many reasons. Tests are performed for routine health screenings or if a disease or toxicity is suspected. Lab tests may be used to determine if a medical condition is improving or worsening. Lab tests may also be used to measure the success or failure of a medication or treatment plan. Lab tests may be ordered for professional or legal reasons. The following is a possible reason why this test may be done:
- CMV infection - Cytomegalovirus infection
When and how often should I have this test?
When and how often laboratory tests are done may depend on many factors. The timing of laboratory tests may rely on the results or completion of other tests, procedures, or treatments. Lab tests may be performed immediately in an emergency, or tests may be delayed as a condition is treated or monitored. A test may be suggested or become necessary when certain signs or symptoms appear.
Due to changes in the way your body naturally functions through the course of a day, lab tests may need to be performed at a certain time of day. If you have prepared for a test by changing your food or fluid intake, lab tests may be timed in accordance with those changes. Timing of tests may be based on increased and decreased levels of medications, drugs or other substances in the body.
The age or gender of the person being tested may affect when and how often a lab test is required. Chronic or progressive conditions may need ongoing monitoring through the use of lab tests. Conditions that worsen and improve may also need frequent monitoring. Certain tests may be repeated to obtain a series of results, or tests may need to be repeated to confirm or disprove results. Timing and frequency of lab tests may vary if they are performed for professional or legal reasons.
How should I get ready for the test?
To prepare for giving a urine sample, be sure to drink enough fluids before the test, unless you have been given other instructions. Try not to empty your bladder before the test.
There is no preparation needed for this test.
How is the test done?
A sample of urine or a sample of saliva may be collected for this test.
Immediately before a test that requires a clean urine sample, males must clean, rinse, and dry the head of the penis. Females must clean, rinse, and dry the urethral area. As you begin urinating, allow a small amount of urine to go into the toilet, and then stop the urine stream. Position the container to collect your urine, and urinate into the container. Remove the container when it has a sufficient amount of urine in it, and finish urinating into the toilet.
The urine sample may also be collected from a urinary catheter. If a catheter is present, the healthcare worker will collect urine from the catheter for testing. If there is no catheter present, a catheter may need to be inserted temporarily to collect the sample. The area will be cleaned, and a sterile catheter will be inserted into your urethra. Urine will drain from the catheter into a container for the test. When sufficient urine has been collected, the catheter will be removed. A special bag may be used to collect a urine sample from an infant.
Saliva samples may be collected by having you spit into a plastic tube several times or by using a swab. For the swab method you will need to open your mouth wide. The person doing the test will use a long, sterile cotton swab to wipe the inside of your cheeks. The swab may be rubbed several times to collect the sample. Do not close your mouth when the sample is being collected. After the sample has been collected, the swab will be taken out and tested.
How will the test feel?
The amount of discomfort you feel will depend on many factors, including your sensitivity to pain. Communicate how you are feeling with the person doing the test. Inform the person doing the test if you feel that you cannot continue with the test.
There is usually no pain experienced when a clean-catch urine sample is given or when the sample is taken from an existing urinary catheter. If an intermittent (temporary) catheter is used to obtain the sample, you may feel some discomfort.
This test usually causes no discomfort.
What should I do after the test?
After collecting a urine sample, close the container if it has a lid. Place the container where the healthcare worker asked you to put it. Clean your hands with soap and water.
There are no special instructions to follow after this test.
What are the risks?
Clean urine: There are several different ways that may be used to collect a sample of clean urine. Urine may be collected by urinating in a cup using the clean-catch technique, or by collecting urine from an existing urinary catheter. Generally, there are no risks when collecting a clean urine sample using either of these methods. Another way to collect a clean urine sample is by inserting a temporary urinary catheter. Risks of using this method include bleeding, infection, catheter misplacement, and damage to the urethra or bladder. If you have a medical condition, or are using a medication or supplement that causes excessive bleeding, you are at a higher risk of bleeding. The person doing this test may need to perform it more than once. Talk to your healthcare worker if you have any concerns about the risks of clean urine collection.
Other body fluid or tissue samples: A different sample other than the samples listed above may be used for this test. Ask your healthcare worker to explain the risks of this test to you. If you have questions or concerns about this test, talk to the healthcare worker.
What are normal results for this test?
Laboratory test results may vary depending on your age, gender, health history, the method used for the test, and many other factors. If your results are different from the results suggested below, this may not mean that you have a disease. Contact your healthcare worker if you have any questions. The following is considered to be a normal result for this test:
What follow up should I do after this test?
Ask your healthcare worker how you will be informed of the test results. You may be asked to call for results, schedule an appointment to discuss results, or notified of results by mail. Follow up care varies depending on many factors related to your test. Sometimes there is no follow up after you have been notified of test results. At other times follow up may be suggested or necessary. Some examples of follow up care include changes to medication or treatment plans, referral to a specialist, more or less frequent monitoring, and additional tests or procedures. Talk with your healthcare worker about any concerns or questions you have regarding follow up care or instructions.
Where can I get more information?
- Henry JB (Ed): Clinical Diagnosis and Management by Laboratory Methods, Twentieth. W.B. Saunders Company, Philadelphia, PA, USA, 2001.
- Tietz NW (Ed): Clinical Guide to Laboratory Tests, 3rd ed. W. B. Saunders, Philadelphia, PA, 1995.
- Lipitz S, Achiron R, Zalel Y, et al: Outcome of pregnancies with vertical transmission of primary cytomegalovirus infection. Obstet Gynecol 2002; 100(3):428-33.
- Miller MJ, Bovey S, Pado K, et al: Application of PCR to multiple specimen types for diagnosis of cytomegalovirus infection: comparison with cell culture and shell vial assay. J Clin Microbiol 1994; 32(1):5-10.
- Warren WP, Balcarek K, Smith R, et al: Comparison of rapid methods of detection of cytomegalovirus in saliva with virus isolation in tissue culture. J Clin Microbiol 1992; 30:786-789.
- Swenson PD & Kaplan MH: Comparison of two rapid culture methods for detection of cytomegalovirus in clinical specimens. J Clin Microbiol 1987; 25(12):2445-6.
- Paya CV, Wold AD, & Smith TF: Detection of cytomegalovirus infections in specimens other than urine by the shell vial assay and conventional tube cell cultures. J Clin Microbiol 1987; 25(5):755-7.