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pH Measurement — Specimen and Method Not Specified

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

Measures the pH of a specimen. The slug does not clearly identify the specimen type or testing method.

Quick summary

["A pH test measures how acidic or alkaline a specimen is, but its meaning depends on what was tested."]

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

Key facts at a glance

LOINC
92199-9
Short code
PH emerg budget breakdown details Doc
Synonyms
PH emerg budget breakdown details Doc
Category
liver
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 is this test?

A pH test measures the acidity or alkalinity of a sample. The abbreviation in this slug identifies pH, but the remaining text does not clearly specify a specimen, method, or particular type of pH measurement.

Why might I need this test?

Depending on the specimen, pH testing may help evaluate acid-base balance, infection, kidney function, digestion, or the condition of a body fluid. Your healthcare professional can explain the reason this test was ordered.

How is the test performed?

A laboratory instrument measures the pH of the submitted specimen. The collection procedure and instrument vary by specimen type, so the original laboratory order or report is needed for exact details.

How do I prepare for the test?

Preparation depends on the specimen being tested. Some tests may require fasting, timed collection, or special handling, while others require little preparation; follow the instructions provided by your clinician or laboratory.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

pH test

Frequently asked questions

What does a pH test measure?
It measures the acidity or alkalinity of a specimen on a pH scale. Lower values are more acidic, while higher values are more alkaline.
Can I tell what specimen was tested from this slug?
No. The slug clearly indicates a pH measurement but does not reliably identify whether the specimen was blood, urine, or another sample.
Does an abnormal pH result always mean there is a serious problem?
Not necessarily. Results must be interpreted using the appropriate reference range, other laboratory findings, symptoms, and the specimen type, so discuss the result with your healthcare professional.
  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