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Hemoglobin A1c (HbA1c) with 24-Hour Urine Collection for Creatinine Clearance

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

This test measures your average blood sugar levels over the past 2–3 months and evaluates how well your kidneys are filtering waste from your blood.

Quick summary

["Helps track diabetes management and kidney health in tandem."]

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

Key facts at a glance

LOINC
67769-0
Short code
HEDIS 2012-13 PPC-C CMV
Synonyms
HEDIS 2012-13 PPC-C CMV
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

Why This Test Matters for Diabetes Care

HbA1c reflects your blood sugar control over time, while creatinine clearance assesses kidney function. Together, they provide a clearer picture of how well your body manages glucose and filters waste.

How the HbA1c Test Works

Your blood is drawn to measure HbA1c, which binds to red blood cells and reflects long-term blood sugar levels. Urine is collected over 24 hours to measure creatinine, a waste product filtered by kidneys.

What to Expect Before the Test

No special preparation is needed for HbA1c, but you may be asked to fast for 8–12 hours if your creatinine clearance requires a urine sample. Drink plenty of water the day of testing to support kidney function.

Common Results and Next Steps

High HbA1c (above target) may indicate poor diabetes control, while abnormal creatinine levels could signal kidney issues. Your doctor will discuss results and adjust care plans accordingly.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HbA1c + Kidney Function Test

Frequently asked questions

What does an abnormal HbA1c result mean?
An elevated HbA1c (above your target range) suggests your blood sugar has been consistently high, which may require lifestyle or medication adjustments. A low creatinine clearance could mean your kidneys are working harder than usual.
Can I eat or drink before the HbA1c test?
For HbA1c alone, no fasting is required. For creatinine clearance, follow your doctor’s instructions—often involving a 24-hour urine collection, so drink as directed.
How often should I get this test?
Typically, HbA1c is checked every 3–6 months if you have diabetes. Creatinine clearance may be part of routine kidney screenings or if kidney health is a concern.
  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