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Titratable Acidity in Serum (or Plasma) by pH Measurement

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

This test measures how much acidity can be neutralized in your blood serum or plasma, determined by how much you can lower the pH (acidity level) through titration.

Quick summary

["Helps assess your body’s ability to balance acidity, which is critical for normal metabolism and organ function."]

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

Key facts at a glance

LOINC
71793-4
Short code
T palldm Ab Titr SerPl Aggl
Synonyms
T palldm Ab Titr SerPl Aggl
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
aggl
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?

Titratable acidity reflects the total amount of acid that can be neutralized in your blood. It’s influenced by metabolic processes, kidney function, and dietary factors. This measurement indirectly evaluates your body’s buffering capacity—its ability to resist changes in blood pH.

Why Might You Need This Test?

Doctors may order this test if you have symptoms like fatigue, muscle weakness, or unexplained metabolic disturbances. It can also help diagnose conditions affecting acid-base balance, such as kidney disease or certain metabolic disorders.

How Is the Test Performed?

A blood sample is drawn, and the serum or plasma is mixed with a known base solution. The test measures how much base is needed to raise the pH to a neutral level, indicating the total acidity present.

What Are Common Uses?

This test is less commonly used than direct pH measurements but may be part of broader metabolic evaluations, particularly in cases where acid-base imbalances are suspected.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This test provides insight into your body’s ability to handle acid production, which is vital for maintaining homeostasis. Abnormal results may signal underlying conditions like renal failure, diabetic ketoacidosis, or other metabolic disorders that disrupt normal acid-base equilibrium.

Short name

Serum/Plasma pH Titration

Frequently asked questions

What does a high or low titratable acidity mean?
A high titratable acidity may suggest excessive acid production or impaired buffering, while a low value could indicate reduced acid excretion or overcompensation by the body. These findings are context-dependent and require interpretation by a healthcare provider.
How long does it take to get results?
Results are typically available within 1 to 3 business days, depending on lab processing times and whether additional testing is needed.
Can diet or medications affect this test?
Dietary factors like high-protein or high-acid foods may influence acidity levels, but the test itself focuses on the measurable capacity to neutralize acid rather than immediate dietary intake. Medications that alter acid-base balance (e.g., diuretics, certain antibiotics) could also impact results.
  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