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Hemoglobin A1c Index Adjusted for Temperature and Blood Mixing

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

This test measures your long-term average blood sugar levels using hemoglobin A1c, adjusted for factors like temperature and sample preparation. It helps doctors assess diabetes control over the past 2–3 months.

Quick summary

["This adjusted index provides a more accurate reflection of your blood sugar trends, accounting for lab conditions."]

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

Key facts at a glance

LOINC
50990-1
Short code
Horowitz index temp adj BldMV+IhG-Rto
Synonyms
Horowitz index temp adj BldMV+IhG-Rto
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What Is the Purpose of This Test?

Doctors use this test to monitor how well your blood sugar is managed over time, especially if your results vary due to temperature or sample handling. Adjustments help ensure reliable long-term diabetes tracking.

How Is This Test Different from a Standard HbA1c?

Unlike standard HbA1c, this version accounts for temperature and mixing effects, which can slightly alter results. It helps correct minor lab variations for more precise interpretation.

What Does a High or Low Result Mean?

Results reflect your average blood sugar levels but may be adjusted slightly based on lab conditions. High levels suggest poor control, while low levels may indicate underestimation due to adjustments.

How Is This Test Performed?

A small blood sample is drawn from your arm. The lab processes it to measure hemoglobin A1c, then applies adjustments for temperature and mixing to refine the reading.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Adjustments ensure the test reflects true long-term glucose trends, reducing minor errors from sample handling or temperature. This helps clinicians make more accurate diabetes management decisions.

Short name

HbA1c Temp-Adjusted Index

Frequently asked questions

Why was this specific adjustment included in my test?
Your lab may have used this method to account for minor variations in sample preparation or storage conditions, ensuring your results are as accurate as possible.
Does this test replace standard HbA1c?
No, this is a refined version of HbA1c. Your doctor may use both to confirm trends, but this adjusted index provides a more precise snapshot of your blood sugar control.
Will this change my treatment plan?
Possibly. Since adjustments account for lab factors, your doctor may use this test to fine-tune diabetes care if your results show consistent trends despite minor fluctuations.
  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