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Lactate Concentration, Heel-Collected Sample (Deprecated)

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

A legacy test measuring lactate in a heel-collected sample. This test code is no longer in active use, and one numeric qualifier is unclear.

Quick summary

["This deprecated test measured the amount of lactate in a sample collected from the heel."]

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

Key facts at a glance

LOINC
36440-6
Short code
Deprecated Heel-L CT WO contr
Synonyms
Deprecated Heel-L CT WO contr
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ct
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 appears to be a legacy test for measuring lactate concentration in a sample collected from the heel. Lactate is a substance produced when the body breaks down carbohydrates for energy.

Why might I need this test?

A lactate measurement may help clinicians evaluate how efficiently the body is using oxygen or handling metabolic stress. It may be considered alongside symptoms, medical history, and other laboratory results.

How is the test performed?

A small sample is collected from the heel and tested to determine its lactate concentration. The specific laboratory method is not identified in this legacy test code.

How do I prepare for the test?

Heel collection generally requires no special preparation, but you should follow the instructions provided by your healthcare professional. The exact collection conditions may vary because this test code is deprecated and contains an unclear numeric qualifier.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lactate concentration (heel sample)

Frequently asked questions

Is this test still commonly used?
No. The code is marked as deprecated, meaning it has been retired or replaced in the laboratory test catalog. Ask your healthcare professional which current test should be used instead.
What does a high lactate level mean?
A high level can suggest increased anaerobic metabolism, such as when the body is under significant stress or not receiving enough oxygen. It does not identify a single cause and should be interpreted alongside the clinical situation.
Does the test require fasting?
Fasting requirements are not provided in the legacy test information. Follow any specific instructions from the healthcare professional ordering the test.
  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