Health Guide

Microbial ova-parasite examination, urine

What is this test?

This test detects ova (egg) or parasites in urine. It is used to evaluate a suspected parasitic infection called schistosomiasis. This infection is caused by Schistosoma (parasitic worms)[1][2][3][4].

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. You may need this test if you have:

  • Infection by Schistosoma

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.

Samples for this test may be collected over 2 to 3 consecutive days[4][5].

How should I get ready for the test?

Random terminal urine:

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.

24 hour terminal urine collection:

During a 24-hour urine collection, follow your usual diet and drink fluids as you ordinarily would, unless healthcare workers give you other instructions. Avoid drinking alcohol before and during the urine collection.

How is the test done?

A terminal urine sample may be collected randomly or over 24 hours for this test. A terminal urine sample collects the last portion of the urine passed (approximately 10 to 20 milliliters).

Random terminal urine:

Ask the healthcare worker how to properly collect the samples needed for this test[6].

24 hr terminal urine collection:

For this type of urine collection, all of the "terminal urine" that you pass over a 24 hour period must be collected[6]. Ask the healthcare worker how to properly collect the samples needed for this test.

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.

Random or 24 hour terminal urine collection:

This test usually causes no discomfort.

What should I do after the test?

Random terminal urine:

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.

24 hour terminal urine collection:

When 24-hour urine collection is complete, close the container and seal the lid tightly. Return the sample in the urine container to the facility or healthcare worker as instructed. If you had the sample in an ice bath, return the sample within two hours after removing the container from the ice bath.

What are the risks?

Urine: A urine test is generally considered safe. Talk to your healthcare worker if you have questions or concerns about this test.

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:

  • Negative

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?

Related Companies

  • Centers for Disease Control and Prevention (CDC) -
  • World Health Organization -


[1] Attallah AM, Ismail H, El Masry SA, et al: Rapid detection of a Schistosoma mansoni circulating antigen excreted in urine of infected individuals by using a monoclonal antibody. J Clin Microbiol 1999; 37(2):354-357.

[2] Al-Sherbiny MM, Osman AM, Hancock K, et al: Application of immunodiagnostic assays: detection of antibodies and circulating antigens in human schistosomiasis and correlation with clinical findings. Am J Trop Med Hyg 1999; 60(6):960-966.

[3] Kahama AI, Odek AE, Kihara RW, et al: Urine circulating soluble egg antigen in relation to egg counts, hematuria, and urinary tract pathology before and after treatment in children infected with Schistosoma haematobium in Kenya. Am J Trop Med Hyg 1999; 61(2):215-219.

[4] Kahama AI, Nibbeling HAM, Zeyl RJM Van, et al: Detection and qualification of soluble egg antigen in urine of schistosoma haematobium-infected children from kenya. Am J Trop Med Hyg 1998; 59(5):769-774.

[5] Tietz NW (Ed): Clinical Guide to Laboratory Tests, 3rd ed. W. B. Saunders, Philadelphia, PA, 1995.

[6] Francis J, Barrett SP, & Chiodini PL: Best practice guidelines for the examination of specimens for the diagnosis of parasitic infections in routine diagnostic laboratories. J Clin Pathol 2003; 56(12):888-891.

Last Updated: 7/4/2018
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