---
title: "Hyaline casts levels: what casts are, the normal count, when hyaline casts are harmless, and which other cast types signal kidney disease"
type: biomarker
url: "https://www.test-well.com/biomarkers/hyaline-casts"
also_known_as:
  - hyaline casts
  - hyaline casts, urine
  - casts
  - casts, ua
  - urinary casts
  - urine casts
category: Urinalysis
units:
  - /lpf
order_price_usd: 17.99
order_item: Complete Urinalysis Test
order_url: "https://www.test-well.com/tests/urinalysis"
reviewed_at: 2026-11-03
---

# Hyaline casts levels: what casts are, the normal count, when hyaline casts are harmless, and which other cast types signal kidney disease

> Hyaline Casts is measured with a urine sample; no fasting is needed. A typical reference range is 0 – 2 /lpf. At TestWell it's $17.99 all-in as Complete Urinalysis Test, results in 1–3 business days, drawn at Labcorp. An out-of-range result is a prompt to look closer, not a diagnosis.

Casts are tiny cylinders that form inside the kidney tubules from a protein called uromodulin (Tamm–Horsfall protein) and are washed out in the urine. Hyaline casts are the plain, protein-only kind: a few are normal, and more appear with dehydration, exercise, fever and diuretics without meaning anything. The casts that matter are the ones with something trapped in them — red cells, white cells, tubular cells or granular debris — each of which points to a specific kind of kidney disease.

Also known as: hyaline casts, hyaline casts, urine, casts, casts, ua, urinary casts, urine casts.

## Key facts

| Fact | Value |
| --- | --- |
| Units | /lpf |
| Sample | Urine sample |
| Fasting | Not required |
| Results | 1–3 business days |
| Price | $17.99 |
| Labs | Labcorp · BioReference in NY/NJ |

## What do hyaline casts measure?

The cells lining the thick ascending limb of the kidney tubule secrete uromodulin, which gels in concentrated, acidic, slow-flowing urine into a cylinder the shape of the tubule — a cast. When nothing else is in the tubule at the time, the cast is clear and colorless: a hyaline cast. If the tubule contains red cells, white cells, shed tubular cells or cellular debris, those are embedded and the cast takes its name and its meaning from them.

Casts are counted on urine microscopy per low-power field (lpf). Hyaline casts are the only type that is normal in small numbers, 0–2 per lpf; the conditions that concentrate and acidify urine and slow flow — dehydration, exercise, fever, heat — form more of them in a healthy kidney. Because they dissolve in dilute or alkaline urine and break up in a standing sample, a fresh, first-morning specimen is the one that shows them.

The informative casts: red blood cell casts (bleeding inside the glomerulus — glomerulonephritis or vasculitis); white blood cell casts (inflammation or infection in the kidney itself — pyelonephritis or interstitial nephritis); renal tubular epithelial cell casts and granular 'muddy brown' casts (acute tubular necrosis); fatty casts and oval fat bodies (nephrotic syndrome); and broad, waxy casts, formed in dilated, scarred tubules (advanced chronic kidney disease).

## Who should check for casts in urine?

Casts are reported on any urinalysis with microscopy, and they become a deliberate question in anyone with a raised creatinine or falling eGFR, blood or protein in the urine, swelling, new high blood pressure, a recent severe illness, surgery, shock or contrast exposure, nephrotoxic medications, lupus or vasculitis, or a kidney transplant. In those settings the sediment is one of the fastest ways to tell a kidney problem's location — glomerulus, tubule or interstitium — and nephrologists examine it themselves.

In a well person with hyaline casts alone on a routine urinalysis, no blood, no protein and a normal creatinine, no further testing is needed beyond normal hydration and, if the count was high, a repeat on a well-hydrated day.

## How to get tested for urinary casts and prepare

Order a complete urinalysis with microscopy; through TestWell it is collected as a walk-in urine sample at a Labcorp patient service center, and the urinalysis with reflex to culture is also offered at Quest. If kidney function is the question, pair it with a renal function panel or a comprehensive metabolic panel for creatinine and eGFR, and a urine albumin-to-creatinine ratio.

Collect a first-morning, clean-catch midstream sample and deliver it within an hour or two; casts dissolve in alkaline, dilute urine and disintegrate with time. Drink normally — forcing fluids dilutes the sample and hides casts, while dehydration manufactures harmless hyaline ones — and avoid strenuous exercise for 48 hours, which raises hyaline and even granular casts briefly. Note diuretics, fever and any recent illness so that an increase in hyaline casts can be interpreted.

## What is the normal range for Hyaline Casts?

| Population | Reference range |
| --- | --- |
| age 18+, hyaline; microscopy | 0 – 2 /lpf |

Reference intervals differ slightly between labs; the range printed on your report is the one to interpret against. Ranges are usually set so 95% of healthy people fall inside them.

## What is a normal hyaline cast count?

0–2 hyaline casts per low-power field; some laboratories accept up to 5. Any number of red-cell, white-cell, epithelial, granular, fatty or waxy casts is abnormal. An increased hyaline cast count with an otherwise normal urinalysis and normal kidney function is not a disease.

The company casts keep decides their meaning: hyaline casts with protein and blood in the urine and a raised creatinine are part of a kidney picture; hyaline casts alone after a long run or a hot day are physiology. Red-cell casts with dysmorphic red cells and protein is nephritic syndrome; granular casts with a rising creatinine after an operation, sepsis or contrast is acute tubular necrosis; waxy casts in someone with a long-standing low eGFR is chronic scarring.

## What causes hyaline casts in urine?

Harmless and common: dehydration, strenuous exercise, fever, heat exposure, emotional stress and loop diuretics such as furosemide, all of which concentrate the urine and slow its flow. Also seen in: heart failure and other low-flow states, chronic kidney disease of any cause (alongside other casts), nephrotic syndrome, and pyelonephritis, where hyaline casts accompany white-cell casts. Heavy proteinuria of any origin increases cast formation because protein is the raw material.

The question with any cast report is whether hyaline casts are the only type. A laboratory that reports 'hyaline casts' and nothing else, with a negative protein and blood, is describing a normal kidney under some physiological stress. A report of granular, cellular, fatty or waxy casts, or hyaline casts together with protein, blood or renal tubular cells, is describing kidney injury and needs creatinine, eGFR and a urine albumin-to-creatinine ratio the same week.

## What to check next when casts are found in urine

Hyaline casts only, normal dipstick: hydrate normally and repeat the urinalysis on a rested, well-hydrated day; if it is normal, stop there. Hyaline casts with protein or blood, or any other cast type: serum creatinine and eGFR, a urine albumin-to-creatinine ratio, blood pressure, a complete blood count, and a careful look at the rest of the sediment — dysmorphic red cells and red-cell casts mean glomerulonephritis and an urgent nephrology referral (with ANA, ANCA, complement levels and hepatitis serologies as the work-up); white-cell casts mean pyelonephritis (culture, treat) or interstitial nephritis (stop the offending drug, which is often an NSAID, proton-pump inhibitor or antibiotic); granular and epithelial casts with a rising creatinine mean acute tubular necrosis and same-day assessment; waxy or broad casts mean advanced chronic kidney disease and a nephrology referral if not already under care. A kidney ultrasound is added when obstruction, size or scarring is in question.

## What does a high Hyaline Casts mean?

Hyaline casts rise with dehydration, exercise, fever and diuretics and are usually harmless; red-cell casts mean glomerular bleeding, white-cell casts kidney infection or inflammation, granular or waxy casts tubular injury or chronic kidney disease — those need prompt evaluation.

## How do you get tested for Hyaline Casts?

| Order | Type | Price | Includes |
| --- | --- | --- | --- |
| [Urinalysis, Complete](https://www.test-well.com/tests/urinalysis) | Single test | $17.99 | This marker |
| [Kidney Health Panel](https://www.test-well.com/tests/kidney-health-panel) | Panel | $64.99 | 4 tests |
| [Early Pregnancy Panel](https://www.test-well.com/tests/prenatal-screening-panel) | Panel | $249.99 | 9 tests |
| [Men's Total Body Advanced Panel](https://www.test-well.com/tests/mens-total-body-advanced-panel) | Panel | $999.99 | 65 tests |
| [Women's Total Body Advanced Panel](https://www.test-well.com/tests/womens-total-body-advanced-panel) | Panel | $999.99 | 65 tests |

## Quest vs Labcorp vs BioReference

| Lab | Available | Price | Notes |
| --- | --- | --- | --- |
| Quest Diagnostics | No | — | Not offered through Quest for this test. |
| Labcorp | Yes | $17.99 | Choose Labcorp at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. |
| BioReference (NY & NJ) | Yes | $20.99 | New York and New Jersey orders route here automatically — state rules keep Quest and Labcorp from accepting self-ordered draws. |

- [What a high Hyaline Casts means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/hyaline-casts/high)

## Common questions about Hyaline Casts

### Are hyaline casts in urine normal?

A few are — 0 to 2 per low-power field, and up to 5 at some laboratories. They form from a normal kidney protein whenever urine is concentrated and flowing slowly, so dehydration, exercise, fever, heat and diuretics raise the count without any disease. Hyaline casts alone, with no protein or blood and a normal creatinine, need only normal hydration and perhaps a repeat.

### What is the difference between hyaline casts and granular casts?

Hyaline casts are clear cylinders of protein with nothing trapped in them and are the only type that is normal in small numbers. Granular casts contain the broken-down debris of tubular cells; a few fine granular casts can follow exercise, but coarse or 'muddy brown' granular casts with a rising creatinine are the signature of acute tubular necrosis and need same-day evaluation.

### Which urinary casts are serious?

Red-cell casts, which mean bleeding from the kidney's filters (glomerulonephritis or vasculitis) and are a nephrology emergency; white-cell casts, which mean a kidney infection or interstitial nephritis; granular and epithelial casts with a rising creatinine (acute tubular necrosis); fatty casts (nephrotic syndrome); and broad waxy casts, formed in scarred, dilated tubules in advanced chronic kidney disease.

### Can dehydration or exercise cause casts in urine?

Yes. Both concentrate the urine and slow its flow through the tubules, which is exactly how hyaline casts form, and hard exercise can briefly add a few granular casts and red cells as well. Casts from these causes disappear within a day or two of rest and normal fluids, which is why the first step for an unexpected cast report in a well person is simply a repeat sample.

### Do I need a doctor's order to test my hyaline casts?

No. TestWell's licensed physician network reviews and approves your order — usually within minutes. You can place an order online without an in-person visit or a referral from your own doctor.

### How long does it take to get Hyaline Casts results?

Most Hyaline Casts results are available in 1–3 business days after your specimen arrives at the lab. You'll get an email the moment your results are ready, with everything viewable in your TestWell portal.

### How much does a Hyaline Casts test cost?

Our Complete Urinalysis Test starts at $17.99. That's the all-in price — no copays, no insurance hoops, no surprise bills. HSA and FSA cards are accepted.

### Do I need to fast before my Hyaline Casts test?

Fasting is not required for the Hyaline Casts test. You can have your blood drawn any time of day.

### Which lab will process my Hyaline Casts test?

Your test will be processed by Quest Diagnostics, Labcorp, or BioReference depending on which is closest to you and which lab carries the test. All three are CLIA-certified and trusted by hospitals nationwide. You'll choose your lab during checkout from 4,000+ locations.

## Keep reading

- [Metabolic Lab Testing: Which Panel Do You Actually Need?](https://www.test-well.com/guides/metabolic-lab-testing)
- [How to Read Your Blood Test Results, Line by Line](https://www.test-well.com/guides/how-to-read-your-blood-test-results)
- [Fatigue: which blood tests?](https://www.test-well.com/symptoms/fatigue)
- [Before your test: Hydration](https://www.test-well.com/prep/hydration)
- [Before your test: Exercise](https://www.test-well.com/prep/exercise)
- [Before your test: Recent illness](https://www.test-well.com/prep/recent-illness)

## Sources

- [MedlinePlus (NIH) — Urinalysis](https://medlineplus.gov/lab-tests/urinalysis/)
- [Simerville JA, et al. Urinalysis: a comprehensive review. Am Fam Physician. 2005;71(6):1153–62](https://www.aafp.org/pubs/afp/issues/2005/0315/p1153.html)
- [Cavanaugh C, Perazella MA. Urine sediment examination in the diagnosis and management of kidney disease: core curriculum 2019. Am J Kidney Dis. 2019;73(2):258–72](https://pubmed.ncbi.nlm.nih.gov/30249419/)
- [KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of CKD](https://kdigo.org/guidelines/ckd-evaluation-and-management/)

## Related biomarkers

- [Protein in Urine](https://www.test-well.com/biomarkers/protein-in-urine)
- [Blood in Urine](https://www.test-well.com/biomarkers/blood-in-urine)
- [Ketones in Urine](https://www.test-well.com/biomarkers/ketones-in-urine)
- [Leukocyte Esterase](https://www.test-well.com/biomarkers/leukocyte-esterase)
- [Urobilinogen](https://www.test-well.com/biomarkers/urobilinogen)
- [Bilirubin in Urine](https://www.test-well.com/biomarkers/bilirubin-in-urine)

- [Reference range lookup tool](https://www.test-well.com/tools/reference-range-lookup)
- [Lab unit converter](https://www.test-well.com/tools/lab-unit-converter)
- [All biomarkers](https://www.test-well.com/biomarkers)

---

Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-11-03. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md

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