Urinary Casts — What It Means in Your Urine Test
New to reading lab reports? Start with our guide to reading a blood test report
This looks for tiny tube-shaped clumps that form in your kidneys, which can carry clues about them.
Under the microscope, Urinary Casts appear as small tube-like shapes born within your filtering organs. Because each variety can hold its own hints, spotting them helps your doctor read what may be unfolding inside.
Also known as: Casts (urine), Hyaline casts, Granular casts, RBC casts, WBC casts, Cylindruria
This isn't a case where higher or lower is better. Your body keeps it in a narrow band, and both directions can matter.
Last reviewed: 2026-08-16
What is Urinary Casts?
Casts are tube-shaped moulds of protein that harden inside the kidney's filtering tubules and wash out into the urine. Their shape and any trapped cells reveal what is happening within those tubules.
Why is Urinary Casts tested?
It is checked under the microscope to look for signs from your kidney tubes. Different cast types can reflect different things going on inside the kidney.
What is a normal Urinary Casts range?
- India
- No India-specific national reference interval is published for this parameter; your lab's printed range is the most reliable comparison.
- Global
- Hyaline casts: 0–2 per HPF (may be normal); all other casts: none expected
Ranges vary by lab, method and equipment — the range printed on your own report is the one that applies to your result.
Source: [CLSI, 2009]
What does your Urinary Casts value mean?
There is no widely-accepted set of value bands for this parameter. Compare your result with the reference range printed on your own report, and discuss it with your doctor.
What does a high Urinary Casts result mean?
Casts that carry cells inside can reflect something affecting your kidney tubes or filters. This usually calls for a closer look at your kidneys, worth discussing with your doctor.
What does a low Urinary Casts result mean?
A few plain (hyaline) casts are considered normal. Having no cell-carrying casts is the expected finding.
What can affect your Urinary Casts result?
- Hard exercise (a few plain casts)
- Concentrated or acidic urine
- Long storage
- Correct spinning of the sample
- Hydration
Questions to ask your doctor
About this result
- What does my Urinary Casts result mean for me specifically, given my age and health?
- Is my Urinary Casts in the range that is right for me, not just the lab's general range?
What to do next
- Could anything I eat, do, or take have affected my microscopic protein molds from the kidney tubules result?
- Is there anything I should do about my Urinary Casts, or is it fine to leave as it is?
About retesting
- Does my Urinary Casts need to be repeated, and if so, when?
- The typical range for Urinary Casts can vary between labs — should I compare my result against my own lab's printed range?
The bigger picture
- Should my Urinary Casts be looked at together with my Urine pH and Urine Specific Gravity result?
- Does my Urinary Casts connect to any condition I already have, or to anything I have noticed in how I feel?
Frequently asked questions
- What is Urinary Casts?
- Casts are tube-shaped moulds of protein that harden inside the kidney's filtering tubules and wash out into the urine. Their shape and any trapped cells reveal what is happening within those tubules. It is checked under the microscope to look for signs from your kidney tubes. Different cast types can reflect different things going on inside the kidney.
- What is a normal microscopic protein molds from the kidney tubules range?
- A typical adult range is around Hyaline casts: 0–2 per HPF (may be normal); all other casts: none expected. No India-specific national reference interval is published for this parameter; your lab's printed range is the most reliable comparison. Ranges vary by lab, method and equipment — the range printed on your own report is the one that applies to your result.
- What does a high Urinary Casts result mean?
- Casts that carry cells inside can reflect something affecting your kidney tubes or filters. This usually calls for a closer look at your kidneys, worth discussing with your doctor.
- What does a low Urinary Casts result mean?
- A few plain (hyaline) casts are considered normal. Having no cell-carrying casts is the expected finding.
- What can affect your Urinary Casts result?
- Several everyday factors can influence it, including Hard exercise (a few plain casts), Concentrated or acidic urine, Long storage, Correct spinning of the sample, Hydration.
Sources
- CLSI (2009) — CLSI GP16-A3 Urinalysis; Approved Guideline
- KDIGO (2012) — KDIGO 2012 Clinical Practice Guideline for Acute Kidney Injury
Part of the Urine (Urinalysis)
Related tests in this panel
Related reading
Check your Urinary Casts
Upload your report to see your Urinary Casts explained for you.
Upload your report