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Bilirubin, Stone — Mass Fraction, Infrared Spectroscopy

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

Measures the proportion of bilirubin in a removed stone using infrared spectroscopy to help determine the stone’s composition.

Quick summary

["This test identifies how much of a stone is made up of bilirubin; it is not a blood test for liver function."]

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

Key facts at a glance

LOINC
74434-2
Short code
Bilirub MFr Stone IR
Synonyms
Bilirub MFr Stone IR
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
infrared-spectroscopy
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?

This laboratory test measures the amount of bilirubin in a stone sample. Infrared spectroscopy is used to estimate bilirubin as a proportion of the stone’s total mass.

Why might I need this test?

Stone analysis may be performed to determine what materials formed the stone. The bilirubin result can help identify a pigment contribution and may guide decisions about treatment or prevention of future stones.

How is the test performed?

A laboratory prepares a portion of the stone and analyzes it using infrared spectroscopy. The report estimates the bilirubin mass fraction, or the relative amount of bilirubin in the stone.

How do I prepare for the test?

No fasting is usually required. If a stone has been removed, place it in the container provided and follow the laboratory’s collection and transport instructions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Stone Bilirubin

Frequently asked questions

Does this test measure bilirubin in my blood?
No. It measures bilirubin within a stone sample and does not directly evaluate blood bilirubin levels or liver function.
Do I need to fast before this test?
No fasting is generally needed. Follow the laboratory’s instructions for collecting and transporting the stone.
Does a high bilirubin result mean I have liver disease?
Not necessarily. The result describes the composition of the stone, not the health of your liver, and should be interpreted with your other medical findings.
  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