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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 over the past 2–3 months and checks how well your kidneys are functioning. It’s often used together to assess both diabetes management and kidney health.

Quick summary

["Helps track long-term blood sugar control and kidney function in one combined test."]

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

Key facts at a glance

LOINC
54062-5
Short code
HEDIS 2009-10 PPC-C HSV
Synonyms
HEDIS 2009-10 PPC-C HSV
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 Blood Sugar Control

HbA1c reflects your blood sugar levels over time, giving doctors a clearer picture than daily readings alone. It’s especially useful for people with diabetes to adjust treatment plans and avoid complications like nerve damage or heart disease.

Understanding Kidney Function in the Test

The creatinine clearance part evaluates how well your kidneys filter waste from blood. This helps identify early kidney problems, which can be linked to diabetes or other health conditions.

How the Test Works

Your blood is tested for HbA1c (via immunoassay) and a 24-hour urine sample is analyzed for creatinine (likely via nephelometry or similar method) to estimate kidney function. Results help balance blood sugar goals with kidney health.

What to Expect Before the Test

For HbA1c: No special prep is needed. For creatinine clearance: Collect all urine for 24 hours (start timing after your first morning urine). Drink normal fluids unless instructed otherwise.

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 suggests your blood sugar has been consistently higher than recommended, which may require changes in diet, exercise, or medication. A low creatinine clearance could mean your kidneys aren’t filtering waste as well, which may need further evaluation by your doctor.
How long does it take to get results?
Results for HbA1c are typically available within 1–3 business days. Kidney function (creatinine clearance) may take longer, sometimes up to a week, depending on lab processing times.
Can I eat or drink normally before this test?
Yes, you can eat and drink normally for the HbA1c part. For the 24-hour urine collection, avoid special diets or supplements unless your doctor advises otherwise, as they could affect creatinine levels.
  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