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Blood Test Tracker

Urine Yeast

Whether yeast cells are seen in a urine sample under the microscope. It is often contamination from the skin or genital area, but it can matter in some people.

AI-verified against cited sources. Awaiting expert reviewLOINC 21033-6

What it is

Yeast are tiny fungi, and the most common kind seen in urine is Candida. Under the microscope they look like small, round or oval cells, sometimes with buds or thread-like strands. Labs report them as none seen, as a number per high-power field (HPF), or in words such as few or many. This is a microscope finding. It cannot tell the exact type of yeast, or whether there is an infection.

Why it matters

Yeast in a urine sample often comes from the skin or genital area while the sample is collected, and many people who have yeast in their urine have no symptoms. It matters more in people with diabetes, a urinary catheter, a weakened immune system or recent antibiotics, and when it comes with symptoms or white blood cells. Your clinician reads it with your symptoms and other urine results, and may order a urine culture. Many cases need no treatment, and treatment is kept for specific situations.

If it’s high

Yeast seen on a urine microscope exam is not a diagnosis by itself. Most often it is contamination or harmless colonization. It is more likely to matter if you have symptoms, a catheter, diabetes or a weakened immune system, or if many yeast cells show up together with white blood cells.

Common causes

  • Contamination from the skin or genital area during collection, including a vaginal yeast infection
  • Sugar in the urine, from high blood sugar or from some diabetes medicines (SGLT2 inhibitors), which yeast can feed on
  • A urinary catheter or other urinary tract device
  • Recent antibiotics
  • A weakened immune system
  • Urinary tract problems such as blockage or poor bladder emptying
  • A true yeast infection of the bladder or kidneys, which is less common

What can help

  • Use the clean-catch method and take the sample to the lab promptly
  • Tell your clinician about genital itching or discharge, diabetes, a catheter or recent antibiotics
  • Ask whether a repeat sample or a urine culture is needed

What can affect your result

  • How clean the sample was (clean-catch midstream)
  • A yeast infection of the genital area
  • Blood sugar and sugar in the urine
  • A catheter, recent antibiotics or a weakened immune system
  • How long the sample stood before it was examined
  • Yeast from the skin or genital area can get into a sample that was not collected clean-catch (Poloni 2020).
  • Under the microscope, yeast cells can look like red blood cells, oil droplets or calcium oxalate crystals, and automated analyzers can count yeast as red cells.
  • If urine stands for a long time, thread-like pseudohyphae can appear.
  • Labs report yeast differently: none seen, per high-power field, in words, or as present or absent. Separate codes exist for budding yeast, hyphae and pseudohyphae.

A midstream clean-catch sample, examined fresh. AFP advises examining urine within 2 hours, or refrigerating it if there will be a delay. Reflects the sample at the moment of collection.

When to talk to a clinician

See a clinician if you have burning with urination, pelvic or back pain, fever or chills, or if you have a catheter or a weakened immune system and yeast was reported. Fever with shaking chills or confusion needs urgent care.

Questions you could ask

  • Does this matter given any catheter, diabetes or immune condition I have?
  • Could this be contamination, and should I give a cleaner sample?
  • Do my symptoms, blood sugar or medicines make this finding more important?
  • Do I need a urine culture?

Questions people ask

Does yeast in my urine mean I have a yeast infection?

Not necessarily. It is often picked up from the skin or genital area while you give the sample, and many people with yeast in their urine have no symptoms. Your clinician looks at your symptoms and other results to decide whether it matters.

Will I need treatment?

Often not. Guidelines keep treatment for specific situations, and your clinician decides based on your symptoms, health conditions and other test results.

How can I give a cleaner sample?

Wash your hands, clean the genital area with the wipe you are given, start urinating into the toilet for a few seconds, then collect the middle part of the stream in the container. Finish in the toilet and cap the container without touching the inside.

Show the science and sources

For clinicians and researchers

Candida species are the usual yeasts in urine. Poloni and Rotta (J Fungi 2020) describe yeast cells as ovoid, spherical or elongated, pale green with smooth, well-defined walls at 400x, seen without stain, with pseudohyphae appearing if urine stands, and note they can resemble erythrocytes, lipid droplets, calcium oxalate monohydrate crystals and acanthocytes; the 2019 Ann Lab Med review notes automated analyzers can misclassify yeast as red cells. They also state that yeast in sediment can reflect sample contamination and should not be over-interpreted. Colony counts cannot separate contamination, colonization and infection (Andryszkiewicz 2026), current laboratory techniques cannot tell colonization from infection, and most candiduria is asymptomatic (Castellano-Sanchez 2026). Reported risk factors are urinary catheters or nephrostomy tubes, urinary tract abnormalities, abdominal surgery, broad-spectrum antibiotics, female sex, age over 65, diabetes, immunosuppression, mechanical ventilation and ICU stay. Management guidance, including the IDSA candidiasis guideline as summarized by Castellano-Sanchez 2026, stresses controlling risk factors and reserving antifungal treatment for specific clinical situations. SGLT2 inhibitor glycosuria raises the risk of genital mycotic infection (Andryszkiewicz 2026). LOINC has separate codes for budding yeast, hyphae and pseudohyphae.

LOINC 21033-6 (primary), 32356-8, 5822-2, 105099-6, 87831-4. Specimen: urine.

Sources

  1. Urine Sediment Findings and the Immune Response to Pathologies in Fungal Urinary Tract Infections Caused by Candida spp., Journal of Fungi (2020)
  2. Characteristics and Clinical Relevance of Candiduria in Hospitalized Patients, Journal of Clinical Medicine (2026)
  3. SGLT2 Inhibitors in Clinical Practice: Cardiorenal Benefits and Risk of Fungal Infections: A Nephrologist's Perspective, Journal of Clinical Medicine (2026)
  4. Progress in Automated Urinalysis, Annals of Laboratory Medicine (2019)

AI-verified against cited sources. Awaiting expert review. Last reviewed 2026-10-03. How we build and check these pages.

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