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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 checks how well your kidneys are functioning. It’s often used to monitor diabetes management and kidney health together.

Quick summary

["Helps track diabetes control and kidney function in one combined assessment."]

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

Key facts at a glance

LOINC
45177-3
Short code
HG IgG NCF Ser Ql IF
Synonyms
HG IgG NCF Ser Ql IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
CPT
82784
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 Management

HbA1c reflects your blood sugar levels over time, giving doctors a clearer picture of how well your diabetes is controlled. A stable HbA1c helps prevent long-term complications like nerve damage or kidney issues.

Understanding Kidney Function in the Test

The urine creatinine clearance portion assesses how well your kidneys filter waste. This helps identify early kidney problems that might not show up in other tests.

How the Test Works: Blood and Urine Samples

Your blood is drawn to measure HbA1c, while a 24-hour urine sample is collected to measure creatinine levels. This combined approach provides a fuller picture of your health.

What to Expect Before the Test

No special preparation is needed for the blood draw, but you may be asked to collect urine over 24 hours. Drink plenty of water to help with urine flow.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical for patients with diabetes because it links blood sugar control to kidney health. High HbA1c or abnormal creatinine levels may signal the need for lifestyle changes, medication adjustments, or further medical evaluation.

Short name

HbA1c + Kidney Function Test

Frequently asked questions

Why does my doctor want both HbA1c and kidney function tested together?
Combining these tests helps detect kidney problems early, which can be linked to long-term diabetes complications. It also ensures your diabetes treatment is working as intended.
How often should I expect this test?
Your doctor will determine frequency based on your diabetes management plan and kidney health. Typically, HbA1c is checked every 3–6 months, while kidney function may be monitored more often if needed.
What do abnormal results mean for my treatment?
Abnormal HbA1c may mean your blood sugar isn’t well-controlled, while abnormal creatinine could signal kidney strain. Your doctor will discuss next steps, such as diet changes, medication adjustments, or additional tests.
  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