Three things to know
- Foamy urine alone cannot diagnose proteinuria.
- A urine albumin-to-creatinine ratio helps measure albumin leakage.
- Persistent findings deserve evaluation even when creatinine is normal.
Proteinuria and albuminuria explained
Proteinuria means protein is present in urine; albuminuria refers specifically to albumin. A screening dipstick may detect protein, but a laboratory measurement can help quantify it. The urine albumin-to-creatinine ratio, often written uACR, adjusts for how concentrated a urine sample is.
Why protein may appear
Diabetes and high blood pressure are common contributors, but there are other kidney causes. Fever, strenuous exercise or a urinary infection can sometimes affect testing. A persistent abnormality is interpreted with blood pressure, kidney function, urine microscopy and your medical history.
From a urine finding to a plan
Understanding the result
uACR below 30 mg/g is generally in the normal-to-mildly increased category; 30–300 is moderately increased; above 300 is severely increased. These categories guide assessment rather than providing a complete diagnosis. Your clinician may confirm an unexpected result, often with a first-morning sample.
What evaluation can involve
The next step may include repeat urine testing, blood tests and review of medicines and systemic conditions. Selected cases require additional blood work, imaging or a kidney biopsy discussion. Treatment depends on the cause and may include blood-pressure, diabetes and kidney-protective care with appropriate monitoring.
Questions to bring to your visit
- Was albumin measured or only a dipstick?
- Should I repeat a first-morning sample?
- How will we monitor response?
Common questions
Does foamy urine always mean kidney disease?
No. Appearance alone is unreliable. Urine testing is needed to assess protein.
Can creatinine be normal when urine albumin is high?
Yes. Urine albumin and filtration provide different information, which is why both can matter.
Sources & further reading
- National Kidney Foundation: Albuminuria (opens in a new tab)
- KDIGO: CKD evaluation and management (opens in a new tab)
Education supports, and does not replace, individual care. Dialysis treatments and transplant evaluations are delivered through the appropriate dialysis programs and transplant centers. External resources do not imply endorsement of AspireMed.