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Hemoglobin A1c (HbA1c) with 24-hour urine collection for creatinine clearance calculation

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

This test measures your long-term blood sugar levels (HbA1c) and evaluates how well your kidneys filter blood over 24 hours, using creatinine as a marker.

Quick summary

["Helps track diabetes management and kidney function together in one test set."]

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

Key facts at a glance

LOINC
31775-0
Short code
C trach Ag UrnS Ql
Synonyms
C trach Ag UrnS Ql
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What is HbA1c and why is it measured?

HbA1c reflects the average blood sugar levels over the past 2–3 months by measuring the percentage of hemoglobin molecules attached to glucose. It’s a key tool for diagnosing and managing diabetes, helping doctors assess how well your body controls blood sugar over time.

How is creatinine clearance measured in urine?

Creatinine clearance in urine is a measure of how well your kidneys filter waste products from your blood. Your doctor may use this test to check kidney function alongside your HbA1c results, especially if you have diabetes or other conditions that affect kidney health.

How is this test collected and prepared?

For HbA1c: A small blood sample is taken from your arm. For creatinine clearance: You’ll provide a 24-hour urine sample collected in a special container, starting right after your morning urine of the first day. Follow your doctor’s instructions carefully to ensure accurate results.

How long does it take to get results?

Results for HbA1c are typically ready within 3–5 business days. Creatinine clearance results may take slightly longer, depending on lab processing times. Your doctor will discuss the full report with you.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HbA1c + CrCl 24h

Frequently asked questions

Why do I need both HbA1c and creatinine clearance tested together?
Your doctor may recommend this combined test if you have diabetes or risk factors for kidney disease. HbA1c gives a long-term view of blood sugar control, while creatinine clearance assesses kidney function. Together, they help identify potential issues early and guide treatment adjustments.
Can I eat or drink anything before this test?
For HbA1c: No special diet or fasting is needed. For creatinine clearance: Avoid high-protein foods or supplements 24 hours before your urine collection, as they may affect creatinine levels. Follow your doctor’s specific instructions for your urine sample.
How often should I get this test?
Typically, HbA1c is checked every 3–6 months for people with diabetes. Creatinine clearance may be tested less frequently unless your doctor notices changes in kidney function or blood sugar control. Ask your doctor for personalized recommendations.
  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