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Serum or Plasma Substance Concentration (Bromocresol Green) Test for Soybean Nitrogen Equivalent (SBN)

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

This test measures the amount of soybean nitrogen equivalent in your blood, often used to assess protein status or nutritional health.

Quick summary

["Helps evaluate protein intake and overall nutritional balance in certain clinical contexts."]

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

Key facts at a glance

LOINC
112121-9
Short code
Soybean IgE Qn IA
Synonyms
Soybean IgE Qn IA
Category
glucose
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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 This Test Measures

The test detects soybean nitrogen equivalent, a measure of protein content derived from soy-based substances. It’s typically used in specialized nutritional assessments, such as evaluating protein metabolism or dietary compliance in patients with specific dietary needs.

Why It Might Be Ordered

Your healthcare provider may order this test if you’re following a soy-based diet, have a condition requiring protein monitoring, or are being evaluated for nutritional deficiencies. It can also be part of broader metabolic or nutritional studies.

How It’s Performed

A blood sample is collected, usually from a vein in your arm. The sample is then processed to measure the concentration of soybean nitrogen equivalent using a bromocresol green dye-binding method.

What the Results Mean

Results are qualitative (yes/no) and indicate whether the measured soybean nitrogen equivalent is present or not. Interpretation depends on clinical context, such as dietary compliance or metabolic monitoring.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

BCG Soybean Nitrogen Equivalent (SBN)

Frequently asked questions

Why would my doctor order this test?
Your doctor might order this test if you’re on a soy-based diet, have a condition requiring protein tracking, or are part of a research study evaluating protein metabolism. It’s less common for routine health checks.
What does a positive result mean?
A positive result means soybean nitrogen equivalent was detected in your blood sample, indicating the presence of soy-derived proteins. This can help confirm dietary compliance or assess protein intake in specific clinical scenarios.
Can this test be used for general health?
No, this test is not typically used for general health monitoring. It’s reserved for specialized nutritional or metabolic evaluations, often in research or controlled dietary studies.
  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