What does it measure?
Kidney filters normally keep most blood proteins in circulation. A urine dipstick mainly detects albumin and reports a rough amount. It is different from a urine albumin-to-creatinine ratio, which can detect smaller increases and adjust for urine concentration.
Before the test
- Collection
- Check whether the request is for one urine sample or a timed collection.
- Mention
- Tell the clinician about recent hard exercise, dehydration, and menstruation.
What can the result mean?
Persistent protein can point to a kidney problem that deserves follow-up. A small temporary increase may occur with hard exercise, illness, or dehydration. A negative strip does not exclude small albumin losses or every type of abnormal protein. [1]
When is it useful, and how is it read?
Read persistent protein with blood pressure, diabetes history, urine blood, and eGFR. Protein appearing during fever or after strenuous activity is not interpreted in the same way as protein that remains on repeat samples. [1]
What can affect it?
A concentrated or contaminated sample can affect interpretation. Pregnancy changes what a positive result may mean, especially alongside raised blood pressure. Your clinician will read this with kidney blood tests, blood pressure, and your history. [1]
Myth: «A negative protein strip rules out kidney damage»
A routine strip can miss smaller albumin losses and some other proteins. A urine albumin-to-creatinine ratio answers a more sensitive, specific question when kidney-risk assessment calls for it. [1]
Questions you might have
Does one positive result mean permanent kidney damage?
No. Protein can rise temporarily. Repeat testing helps show whether it persists. [1]
Why might I need a different urine protein test?
A strip is an initial check. A quantitative test can measure the amount and help guide follow-up. [1]
What comes next?
An unexpected positive often needs confirmation with a fresh sample and a quantitative albumin or protein ratio. Bring recent blood-pressure readings and mention strenuous exercise or illness around the collection. [1]
Is this a temporary finding, and should we confirm it with a urine albumin-to-creatinine ratio?
The reference interval and units on your report are part of understanding your result. Understand units, reference intervals, and treatment targets.
Sources & references
Medical references & original research
Books we consulted
References that informed our explanations of the test and its context.
- Pagana KD, Pagana TJ, Pagana TN. Mosby’s Diagnostic and Laboratory Test Reference. 14th ed. Elsevier; 2019.
Practical-section sources accessed: .
For general health education. Interpreting your result and deciding on tests or treatment requires your health context and a qualified clinician.
