How to Read a Urinalysis: Results and Key Terms

A urinalysis is a laboratory examination of urine. It can report physical properties, chemical markers, and substances or cells seen under a microscope. Learning what the sections mean can help you understand a report and ask focused questions, but it cannot establish a diagnosis on its own. Interpretation depends on the reason for testing, symptoms, medicines, health history, and how the sample was collected.

Before you start, use the complete report from the laboratory or patient portal, including units and reference ranges. Do not compare your numbers with a random online chart: methods and ranges can differ. If the report is incomplete or a result is marked abnormal, contact the clinician who ordered the test for interpretation.

What You’ll Need

The full urinalysis report, including all pages, units, flags, and reference ranges.
Any notes about whether the test was a dipstick, microscopic urinalysis, or urine culture.
The reason for testing and relevant context to share with your clinician, such as symptoms, medicines, supplements, menstruation, or recent strenuous exercise.
A way to write down questions; avoid changing medicines or treatment based on the report alone.

Step-by-Step

Confirm whose report it is. Check the name, collection date, and whether all pages belong to the same test. Make sure you are reading a urinalysis rather than a urine culture alone; these tests answer different questions.
Identify the sections. Reports commonly group findings as physical appearance, dipstick chemistry, and microscopy. Some tests include only a subset. A culture, if ordered, looks for microorganisms that grow from the sample and may report organism identification and susceptibility; it is not simply another dipstick result.
Read the laboratory’s reference range. For each item, note the result, unit, and the lab’s stated range or expected wording. “Negative” or “not detected” generally means the test did not find that marker at its detection limit; it does not mean every possible problem has been ruled out. A flag such as H, L, or abnormal means the value differs from that lab’s criteria, not that a disease is confirmed.
Review appearance and concentration. Color and clarity are descriptive, and can vary with hydration, foods, medicines, and sample handling. Specific gravity estimates how concentrated the urine is. A value can be affected by fluid intake and other factors, so read it with the rest of the report rather than treating it as a stand-alone measure of health.
Read the chemical strip findings. Common entries include pH, protein, glucose, ketones, blood, nitrite, leukocyte esterase, and bilirubin. These are screening clues, not diagnoses. For example, nitrite and leukocyte esterase can support consideration of a urinary infection in the right context, but neither alone proves one; a negative result does not always exclude infection. Protein, blood, glucose, or ketones can have multiple explanations and may need follow-up.
Check microscopic findings. If microscopy was performed, look for red blood cells, white blood cells, epithelial cells, bacteria, crystals, and casts. The report may give counts per high-power field or another unit. Cells or bacteria can reflect illness, contamination, or collection conditions; epithelial cells can be a clue that the specimen was not cleanly collected. Casts and crystals have different meanings depending on type and context.
Look for patterns, not isolated flags. Consider which results are abnormal together and whether they fit the reason for testing. For instance, several findings may lead a clinician to consider further evaluation, but you should not use a pattern to self-diagnose. A culture, repeat sample, or other test may be needed depending on the situation.
Check collection and timing notes. Menstrual blood, vaginal discharge, skin cells, delayed transport, and a sample that was not collected as instructed can affect results. A clinician may ask for a repeat clean-catch sample if contamination is suspected. Do not repeat testing without checking what the ordering clinician recommends.
Discuss the result with the ordering clinician. Ask what the finding means for your specific situation, whether it needs confirmation, and what follow-up is appropriate. Share symptoms, pregnancy status if relevant, medicines, and collection circumstances. Seek prompt medical care for severe symptoms or if the clinician’s instructions say to do so.

Common Mistakes

Treating a flag as a diagnosis: “Abnormal” signals a result to interpret, not a definitive condition.
Assuming a negative test rules everything out: Screening tests have limits, and a result must be read in the context of symptoms and test method.
Using another lab’s ranges: Reference intervals and reporting formats vary. Use the range printed on your own report.
Confusing bacteria on microscopy with a confirmed infection: Bacteria may enter a sample during collection. Symptoms, collection quality, and sometimes culture matter.
Ignoring collection conditions: Menstruation, contamination, or delayed processing may affect some findings. Tell the clinician rather than guessing which results to disregard.
Changing treatment yourself: Do not start, stop, or adjust a prescription based only on a urinalysis. Ask the prescriber or ordering clinician.

Tips

Read the report from top to bottom, and keep the result, unit, reference range, and flag together.
Distinguish “not tested” or blank from “negative.” A blank field may mean the item was not included or not reported.
Keep earlier reports available if your clinician wants to compare results; differences can reflect collection or testing conditions as well as health changes.
Write down questions such as: “Could the sample have been contaminated?” and “Does this result need a culture or repeat test?”
Use the portal’s contact instructions or the ordering office for clarification rather than relying on a color-coded flag alone.

Troubleshooting

The report has no reference ranges: Ask the laboratory or ordering office for the correct interpretation and units. Do not substitute ranges from a different source.

A result is marked abnormal but you feel well: Contact the clinician who ordered the test. Some findings can be temporary or incidental, but only a clinician with your context can decide whether follow-up is needed.

You have symptoms but the urinalysis appears normal: A normal-looking or negative screening result does not always explain symptoms or rule out every cause. Tell the clinician what you are experiencing and ask whether further evaluation is appropriate.

The report says the sample may be contaminated: Ask whether a repeat specimen is needed and how to collect it. Follow the laboratory’s instructions; a clean-catch method is commonly requested, but the exact directions can vary.

You cannot tell what test was done: Look for terms such as dipstick, microscopic examination, or culture, then ask the ordering office to explain which components were performed. A culture result may be finalized separately from the initial urinalysis.

Frequently Asked Questions

What is the difference between a urinalysis and a urine culture?

A urinalysis checks urine appearance, chemical markers, and sometimes cells or other material under a microscope. A culture attempts to grow microorganisms from the sample and can help identify them; it may take longer to report.

Does an abnormal urinalysis mean I have an infection?

No. Some findings can be associated with infection, but they can also have other explanations or result from contamination. A clinician considers symptoms, collection quality, and whether culture or other testing is needed.

Why might my results differ from an online chart?

Laboratories may use different methods, units, and reference criteria. Interpret your result using the range printed on that report, and ask the lab or clinician if the units or range are missing.

Can medicines or food affect a urinalysis?

Some medicines, supplements, foods, hydration changes, and recent exercise can affect urine appearance or selected measurements. Tell the ordering clinician what may be relevant; do not stop a medicine unless the prescriber advises you to.

Should I repeat a test with an abnormal result?

Not automatically. The ordering clinician can decide whether a repeat sample, culture, or another evaluation makes sense based on the finding and your circumstances.

When should I contact a clinician?

Ask the ordering clinician to interpret abnormal results or results that do not match how you feel. Seek prompt care for severe or worsening symptoms, or follow any urgent instructions supplied with your test.

Further reading: MedlinePlus. Details can change, so check the official page for anything that matters to you. Spotted a mistake? Tell us. How we write an answer.