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Urinalysis with guided kidney function assessment (qualitative protein screening and renal function evaluation)

Published: August 9, 2026Updated: August 16, 2026

This test examines your urine for protein and evaluates how well your kidneys are filtering waste from your blood.

Quick summary

["Helps detect kidney issues and monitor protein loss in urine."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
35899-4
Short code
RF Guided Kidney Bx
Synonyms
RF Guided Kidney Bx
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
rf
CPT
86430
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What Does This Test Measure?

The test includes two main parts: a qualitative urine protein screen and a kidney function assessment. Protein in urine may indicate kidney damage or disease, while kidney function measures how effectively your kidneys remove waste and excess fluids from your blood.

Urine Protein (Qualitative)

This part checks for the presence of protein in your urine, which can be abnormal if your kidneys are not working properly. Small amounts of protein in urine are normal, but larger amounts may signal kidney problems.

Kidney Function Assessment

This involves evaluating how well your kidneys filter waste products and maintain fluid balance. While the exact method isn’t specified, it may include indirect measures of kidney function based on urine characteristics.

Why Might You Need This Test?

Your doctor may recommend this test if you have symptoms like swelling, frequent urination, fatigue, or if you have a history of kidney disease, diabetes, or high blood pressure. It can also be part of routine check-ups for certain high-risk groups.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Urinalysis with kidney function check

Frequently asked questions

What does a positive urine protein result mean?
A positive urine protein result means there is more protein than usual in your urine. This can happen if your kidneys are not working well, which may need further testing to determine the exact cause.
How often should I get this test?
Your doctor will determine how often you need this test based on your health history, symptoms, and any ongoing conditions. Regular follow-ups may be recommended if you have kidney-related concerns or risk factors.
Can lifestyle changes help with kidney function?
Yes, maintaining a healthy diet, staying hydrated, managing blood pressure and diabetes, and avoiding smoking can support kidney health. Your doctor may also recommend specific lifestyle adjustments based on your test results.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy