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Blood Test Tracker

Urine Mucus

A rating of how much mucus is seen when urine is looked at under a microscope. Small to moderate amounts are the usual finding.

AI-drafted. Awaiting verificationLOINC 88979-0

What it is

Mucus is a thin, slippery fluid that coats and moistens parts of the body, including the urinary tract. A small amount in your urine is normal. Mucus is also made in the genital area, so some often gets into the sample as it is collected. Under a microscope it shows up as thin threads. Labs report it with words such as none, rare, few, moderate or many, and some use 1+ to 4+. The scale differs by lab, and many urinalysis reports do not list mucus at all.

Why it matters

On its own, a mucus finding adds little. It is read together with the rest of your urinalysis, such as white blood cells, bacteria, nitrite and the symptoms you have. A large amount, especially with other findings, is one reason a clinician may look further. Because collection can add mucus, a repeat clean-catch sample can be a simple way to check.

If it’s high

A large amount of mucus is more than the small or moderate amount seen in most people's urine. Often it comes from how the sample was collected. Sometimes it goes along with a urinary tract infection or another condition, so your clinician will read it with your other results and symptoms.

Common causes

  • Mucus, skin cells or secretions picked up while collecting the sample
  • A urinary tract infection (UTI)
  • A sexually transmitted infection (STI)
  • Kidney stones
  • Irritable bowel syndrome (IBS), which MedlinePlus lists among conditions linked to extra mucus
  • Less often, a problem in the bladder or urinary tract, which your clinician would look for with other tests

What can help

  • Ask whether to give a new clean-catch midstream sample, and ask for the collection steps
  • Tell your clinician about symptoms such as burning when you urinate, needing to go often, cloudy or bad-smelling urine, or pain low in the belly
  • If you get frequent UTIs, ask about further testing and ways to help prevent them

What can affect your result

  • How the sample was collected: a clean-catch midstream sample picks up less outside material
  • Your menstrual period or bleeding hemorrhoids, which can affect a urine sample
  • Who or what reads the sample: manual microscopy and automated analyzers can grade mucus differently
  • The lab's scale: words and counts differ from lab to lab
  • How the sample was collected matters most. Mucus, skin cells and secretions can get into the sample from the genital area, which is why labs ask for a clean-catch midstream sample.
  • A menstrual period or bleeding hemorrhoids can affect a urine sample, so MedlinePlus asks you to tell your provider about them before the test.
  • People reading slides and automated analyzers can grade mucus differently. In one 2024 comparison, agreement between manual microscopy and an automated analyzer was low (kappa 0.296).
  • There is no standard scale. 'Moderate' or '2+' at one lab does not mean the same count as at another.

Any time of day. A clean-catch midstream sample keeps more outside material, including mucus from the skin and genital area, out of the sample. The result reflects only the sample you gave. It can change from one sample to the next.

When to talk to a clinician

Mucus alone is rarely urgent. Contact a clinician soon if you have burning when you urinate, needing to go often, cloudy or bad-smelling urine, pain low in the belly, or dark or reddish urine. A fever, or pain in your back or side along with urinary symptoms, needs prompt attention.

Questions you could ask

  • What does 'moderate' or 'many' mean on my lab's scale?
  • Could this come from how the sample was collected, and should I give another clean-catch sample?
  • Do my other urinalysis results, such as white cells, bacteria and nitrite, point anywhere?

Questions people ask

Is mucus in my urine normal?

A small amount is. MedlinePlus says a normal test result usually shows a small or moderate amount of mucus. A large amount can go along with an infection or another condition, so your clinician will look at your other results too.

Does mucus in my urine mean I have a UTI?

Not by itself. A large amount can go along with an infection, but mucus also gets into samples during collection. Clinicians look at white blood cells, bacteria, nitrite and your symptoms before drawing any conclusion.

Why doesn't my report list mucus?

Not every lab reports it. For example, Labcorp's sample report for its standard complete urinalysis lists white cells, red cells, epithelial cells, casts and bacteria under microscopy, but no mucus line.

Show the science and sources

For clinicians and researchers

Mucus in urine sediment is reported semi-quantitatively by microscopy (none, rare, few, moderate, many; or per low-power or high-power field) or counted by automated sediment analyzers, which list it among their reported particles (for example the Cobas u701). LOINC separates presence, per-area and per-volume results, which is why this entry carries several codes. There is no standardized reference interval. MedlinePlus states that a normal result usually shows a small or moderate amount, and that a large amount may be linked to a urinary tract infection, a sexually transmitted infection, kidney stones, irritable bowel syndrome or bladder cancer. Agreement between manual microscopy and an automated analyzer was low for mucus (kappa 0.296, p = 0.012) in a 2024 comparison of manual and automated urinalysis (Biomed Res Int 2024), so changes between two reports from different labs or methods may not mean much. Labcorp's standard Urinalysis, Complete sample report (test 003772) lists white cells, red cells, epithelial cells, casts and bacteria under microscopy and does not report mucus. Interpret with squamous epithelial cells, which also indicate contamination, and with white cells, bacteria, nitrite and leukocyte esterase.

LOINC 88979-0 (primary), 8247-9, 53321-6, 105106-9, 28545-2, 46421-4, 51478-6. Specimen: urine.

Sources

  1. Mucus in Urine, MedlinePlus (U.S. National Library of Medicine)
  2. Assessing Concordance of Results: A Comparative Study of the Manual and Automated Urinalysis Methods, BioMed Research International 2024 (2024)
  3. Evaluation of the analytical performances of Cobas 6500 and Sysmex UN series automated urinalysis systems with manual microscopic particle counting, Biochemia Medica 2018 (2018)
  4. Urinalysis, Complete (test 003772): sample patient report with reference intervals, Labcorp (2026)
  5. LOINC codes verified with the NLM Clinical Tables LOINC search, U.S. National Library of Medicine

AI-drafted. Awaiting verification. Last reviewed 2026-10-03. How we build and check these pages.

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