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Quantitative Serum Onset Time for Renal Function (Electrophoresis-based)

Published: August 9, 2026Updated: August 17, 2026

This test measures the time-related onset of renal function changes in serum, often assessed through electrophoresis to evaluate early kidney-related biochemical shifts. It may be used in specialized settings to monitor kidney health dynamics.

Quick summary

["This test helps track early kidney function shifts over time, useful in specific diagnostic contexts."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
18513-2
Short code
QRS Onset Time RefB
Synonyms
QRS Onset Time RefB
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
0
Ref high
17
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ekg
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 This Test Measures

The test evaluates the timing of biochemical changes in serum that indicate early kidney involvement. Electrophoresis helps detect subtle shifts in protein or electrolyte patterns associated with renal onset phases.

Why It Might Be Ordered

Your healthcare provider may order this test if you have symptoms or risk factors suggesting early kidney dysfunction, such as persistent swelling, fatigue, or unexplained electrolyte imbalances. It may also be part of a broader evaluation for conditions affecting kidney function onset.

What to Expect Before the Test

No special preparation is typically required. You may provide a blood sample during a routine clinic visit. If you’re on certain medications, inform your provider beforehand.

What to Expect During the Test

A healthcare professional will draw blood from a vein, usually in your arm. The process takes a few minutes, and you may feel slight discomfort. The sample is then processed via electrophoresis to analyze onset-related biochemical markers.

Reference range

NCBI: NSE 0-17 ng/mLN/A

Specimen: serum

No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Serum Renal Onset Time (Screening)

Frequently asked questions

What does a positive or abnormal result mean?
An abnormal result may indicate early kidney involvement, prompting further evaluation by your healthcare provider to assess underlying causes and guide treatment decisions.
How often will I need this test?
The frequency depends on your clinical situation. Your provider will determine how often this test is needed based on your symptoms, risk factors, and overall health.
Can I eat or drink before this test?
No specific dietary restrictions apply, but always follow your provider’s instructions. If you have questions about timing, ask your healthcare team.
  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 17, 2026. · Read our editorial policy