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Titratable Serum Acid Neutralizing Capacity (TANC) or Serum pH Buffer Capacity (Titratable Acid Neutralization)

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

This test measures how well your blood can neutralize acids, reflecting your body’s ability to maintain stable pH levels. It’s often part of broader kidney function or metabolic studies.

Quick summary

["Your kidneys help balance acidity in your blood, and this test checks one way they do it."]

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

Key facts at a glance

LOINC
22590-4
Short code
T palldm Ab Titr Ser
Synonyms
T palldm Ab Titr Ser
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

What Does This Test Measure?

This test evaluates the serum’s capacity to neutralize acids through titration—a process where a known acid is added until the blood reaches a neutral pH. The result helps assess kidney function, acid-base balance, and metabolic health.

Why Might You Need This Test?

Doctors may order this test if you have symptoms like fatigue, muscle cramps, or signs of kidney disease. It can also be part of metabolic evaluations, especially in conditions affecting acid production or excretion.

How Is the Test Performed?

A blood sample is drawn from a vein, typically in your arm. The serum is then analyzed in a lab using titration methods to determine its acid-neutralizing capacity.

What Does a Result Mean?

Results are qualitative (not numerically reported) and compare your blood’s ability to neutralize acids against a standard. Abnormal results may signal kidney dysfunction, metabolic disorders, or other health concerns.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

TANC

Frequently asked questions

How often do I need this test?
This test is usually not a routine screening. It’s often ordered based on specific symptoms, lab findings, or medical conditions like chronic kidney disease, diabetes, or acid-base imbalances. Your doctor will determine if and when it’s needed.
What are the typical reference ranges?
Since this test is qualitative, there are no standard numeric ranges provided. Instead, results are interpreted relative to a standard reference. Your doctor will explain what your result means in the context of your health.
Can I prepare for this test?
No special preparation is usually needed. However, inform your doctor about any medications or conditions that might affect blood acidity, such as kidney disease or diabetes.
  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