Squamous Epithelial Cells

Urine
check icon Optimal Result: 0 - 3 HPF.

What are squamous epithelial cells?

Squamous epithelial cells in urine usually mean the urine sample was contaminated during collection — not that there is kidney damage or cancer. These flat surface cells come from the skin or outer genital area and can enter the sample if clean-catch technique is not perfect. A small number is common and often normal, but higher amounts (such as 10–20 or more per high-power field) typically suggest contamination rather than infection.

Why this marker matters

A higher squamous epithelial cell count most commonly reflects contamination from skin or genital tract cells rather than kidney disease. This matters because contamination can:

  • Increase the chance that bacteria seen on microscopy is from external contamination rather than a true urinary infection

  • Reduce the accuracy of urinalysis for predicting a true positive urine culture

Normal range (and why it varies)

Reference ranges vary between laboratories and reporting methods, which is why your lab’s interval should always guide interpretation.

Many labs consider something like 0–5/HPF as a typical “low/normal” range, but cutoffs vary by lab method (manual microscopy vs automated) and reporting style (HPF/LPF vs qualitative buckets). Use your lab’s reference interval when available.

What Your Squamous Epithelial Cell Result Means (0–5, 6–10, 10–20, 20–40)

Use your lab’s reference range first; these are common interpretations:

  • 0–5/HPF (or “rare/few”): often considered within expected limits.

  • 6–10/HPF: can still be contamination, especially if collection wasn’t clean-catch; interpret other UA markers cautiously.

  • 10–20/HPF: frequently reported as likely contamination; repeat with careful collection if results don’t match symptoms.

  • 20–40/HPF (or “many”): strongly suggests contamination; retesting is commonly recommended before drawing conclusions about infection.

Female-specific note

Squamous epithelial cells are more commonly elevated in females due to anatomy and higher likelihood of vaginal cell contamination during collection. This does not automatically indicate disease. It often indicates the need for repeat clean-catch if the result is being used to evaluate UTI or hematuria.

Does this mean cancer?

Usually, no. Squamous epithelial cells in urine most commonly reflect contamination. Cancer concerns are generally driven by other findings (persistent gross/microscopic hematuria, abnormal urine cytology, risk factors, or persistent symptoms). If you have blood in urine, unexplained weight loss, severe/persistent urinary symptoms, or you were instructed to follow up, talk with a clinician.

When to retest vs when to seek care

Consider repeating the test (clean-catch) if:

  • You have no UTI symptoms, or symptoms are mild/unclear

  • Your report shows high squamous cells with borderline/uncertain infection markers

Seek medical evaluation sooner if:

  • You have UTI symptoms with fever, flank pain, pregnancy, kidney disease, immunosuppression, or worsening symptoms

  • You have persistent hematuria or severe urinary pain

Clean-catch collection (quick checklist)

  • Wash hands

  • Clean genital area thoroughly (front-to-back for females)

  • Start urinating into the toilet, then collect midstream urine in the cup

  • Avoid touching inside of cup/lid

  • Deliver sample promptly per lab instructions

Frequently Asked Questions

How many squamous epithelial cells indicate contamination?

There is no universal cutoff, but counts above 10–20 cells per high-power field (HPF) are commonly associated with sample contamination. Many laboratories recommend repeating the test if results fall in this range and clinical symptoms do not clearly suggest infection.

What does 6–10 squamous epithelial cells in urine mean?

A result of 6–10 cells per high-power field (HPF) is usually a mild elevation. In many cases, this reflects minor contamination during sample collection rather than infection. If you do not have urinary symptoms, your doctor may recommend repeating the test using proper clean-catch technique.

What does 10–20 squamous epithelial cells in urine mean?

A result of 10–20/HPF often suggests contamination of the urine sample. This is especially common in females. If other urinalysis markers (white blood cells, nitrites, bacteria) are borderline or unclear, repeating the test is typically recommended before diagnosing a urinary tract infection.

What does 20–40 squamous epithelial cells in urine mean?

A count of 20–40/HPF or a lab comment such as “many” strongly suggests sample contamination. This level does not automatically indicate infection or kidney disease, but the test may need to be repeated for accurate interpretation.

Are squamous epithelial cells in urine normal?

Yes. A small number — commonly 0–5/HPF or reported as “rare” — is generally considered within normal limits. Interpretation should always follow your laboratory’s reference range.

Do squamous epithelial cells in urine mean infection?

Not by themselves. Squamous epithelial cells most commonly indicate contamination rather than infection. A true urinary tract infection is more strongly suggested by laboratory findings in combination with urinary symptoms, such as:

  • Elevated white blood cells

  • Positive nitrites

  • Bacteria on microscopy

  • Urinary symptoms (burning, urgency, frequency)

Do squamous epithelial cells in urine mean cancer?

Usually, no. Squamous epithelial cells alone do not diagnose cancer. Cancer evaluation is based on persistent blood in the urine, abnormal cytology, imaging findings, or ongoing symptoms — not on squamous cells alone.

Why are squamous epithelial cells more common in females?

Due to female anatomy, vaginal epithelial cells can more easily enter the urine sample during collection. This increases the likelihood of contamination and does not necessarily indicate disease.

Can pregnancy increase squamous epithelial cells in urine?

Yes. During pregnancy, hormonal and anatomical changes can make contamination more likely. However, UTIs are also more common in pregnancy, so elevated cells should be interpreted alongside symptoms and other urinalysis findings.

How can I reduce contamination in a urine sample?

Use proper clean-catch technique:

  • Wash hands

  • Clean the genital area thoroughly

  • Begin urinating into the toilet

  • Collect midstream urine in the cup

  • Avoid touching the inside of the container

  • Deliver the sample promptly

When should I see a doctor?

Seek medical evaluation if you have:

  • Fever or flank pain

  • Persistent blood in urine

  • Severe urinary symptoms

  • Pregnancy with symptoms

  • Worsening or recurring symptoms

If you have elevated squamous epithelial cells without symptoms, a repeat clean-catch urinalysis is often the next step.

References:

Kurn H, Daly DT. Histology, Epithelial Cell. 2023 Feb 17. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan–. PMID: 32644489.

Mohr NM, Harland KK, Crabb V, Mutnick R, Baumgartner D, Spinosi S, Haarstad M, Ahmed A, Schweizer M, Faine B. Urinary Squamous Epithelial Cells Do Not Accurately Predict Urine Culture Contamination, but May Predict Urinalysis Performance in Predicting Bacteriuria. Acad Emerg Med. 2016 Mar;23(3):323-30. doi: 10.1111/acem.12894. Epub 2016 Feb 17. PMID: 26782662.

Maher PJ, Jablonowski KD, Richardson LD. Squamous epithelial cell presence reduces accuracy of urinalysis for prediction of positive urine cultures. Am J Emerg Med. 2020 Jul;38(7):1384-1388. doi: 10.1016/j.ajem.2019.11.024. Epub 2019 Nov 28. PMID: 31843330.

Walter FG, Gibly RL, Knopp RK, Roe DJ. Squamous cells as predictors of bacterial contamination in urine samples. Ann Emerg Med. 1998 Apr;31(4):455-8. doi: 10.1016/s0196-0644(98)70253-7. PMID: 9546013.

Chen A, Caron A, Jackson NJ, Kanji F, Kuhlmann P, Le CH, Eilber KS, Anger JT, Ackerman AL. Defining Properly Collected Urine: Thresholds to Improve the Accuracy of Urinalysis for Microscopic Hematuria Evaluation in Women. J Urol. 2022 Feb;207(2):385-391. doi: 10.1097/JU.0000000000002200. Epub 2021 Sep 21. PMID: 34544262.

Poloni JAT, de Oliveira Vieira A, Dos Santos CRM, Simundic AM, Rotta LN. Survey on reporting of epithelial cells in urine sediment as part of external quality assessment programs in Brazilian laboratories. Biochem Med (Zagreb). 2021 Jun 15;31(2):020711. doi: 10.11613/BM.2021.020711. PMID: 34140834; PMCID: PMC8183119.

Owens CL, Ali SZ. Atypical squamous cells in exfoliative urinary cytology: clinicopathologic correlates. Diagn Cytopathol. 2005 Dec;33(6):394-8. doi: 10.1002/dc.20344. PMID: 16299739.

Regeniter A, Haenni V, Risch L, Köchli HP, Colombo JP, Frei R, Huber AR. Urine analysis performed by flow cytometry: reference range determination and comparison to morphological findings, dipstick chemistry and bacterial culture results--a multicenter study. Clin Nephrol. 2001 May;55(5):384-92. PMID: 11393384.

What does it mean if your Squamous Epithelial Cells result is too high?

High squamous epithelial cells in urine most commonly indicate sample contamination, not kidney damage or cancer. These cells come from the skin or outer genital area and often enter the urine sample during collection, especially in females.

What counts as high?

Although ranges vary slightly by lab:

  • 0–5 cells/HPF: Usually considered within normal limits

  • 6–10 cells/HPF: Mild elevation, often due to collection technique

  • 10–20 cells/HPF: Likely contamination; repeat clean-catch recommended

  • >20 cells/HPF or “many”: Strongly suggests contamination

If squamous epithelial cells are elevated but you have no urinary symptoms, the most appropriate next step is often to repeat the test using proper clean-catch technique.

When it may reflect something more

Less commonly, elevated squamous epithelial cells may be seen with:

  • Urinary tract infection (especially if white blood cells, nitrites, or bacteria are also present)

  • Urethral irritation or recent catheter use

  • Inflammation of the lower urinary tract

On their own, squamous epithelial cells do not diagnose cancer. Cancer evaluation is guided by persistent blood in the urine, abnormal cytology findings, imaging results, or ongoing symptoms — not by squamous cells alone.

What to do next

Consider repeating the urinalysis if:

  • Your result shows 10–20 or more cells/HPF

  • The lab comments mention possible contamination

  • You do not have clear infection symptoms

Seek medical evaluation sooner if you have:

  • Fever

  • Flank pain

  • Persistent blood in urine

  • Pregnancy

  • Severe urinary symptoms

In most cases, elevated squamous epithelial cells are a collection issue rather than a disease marker.

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