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Total Serum Protein by Bromocresol Green (BCG) Method

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

This test measures the total amount of protein in your blood serum, which includes proteins like albumin and globulins. Proteins help maintain fluid balance, support immunity, and transport nutrients.

Quick summary

["Your blood protein levels can indicate overall health, hydration, or potential medical conditions."]

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

Key facts at a glance

LOINC
648-6
Short code
Gram Stn Spt
Synonyms
Gram Stn Spt
Category
chemistry
Sample
sputum
Container
Sterile sputum container
Units
N/A
Ref low
0.8
Ref high
1.2
Critical range
— – 5 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
gram-stain
CPT
85610
SNOMED
396252006
Specimen volume
3-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Doctors may order this test to check for conditions like malnutrition, kidney disease, liver problems, or dehydration. It can also help monitor treatments for certain illnesses.

What Does the Test Involve?

A blood sample is taken from a vein, usually in your arm. The serum is then analyzed using a bromocresol green dye to measure protein concentration.

What Are Normal Results?

There are no specific numeric ranges provided here since they can vary by lab. Your results will be compared to your body’s baseline and clinical context.

What Might Abnormal Results Mean?

Low protein levels might suggest malnutrition, kidney or liver disease, or excessive fluid loss. High levels could indicate dehydration, inflammation, or certain blood disorders.

Reference range

INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A

Specimen: sputum

Inform your healthcare provider if you are taking blood thinners. No special preparation required.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Total protein testing is a general screening tool. While it can hint at underlying issues, further tests may be needed for a full diagnosis.

Short name

Total Protein (Serum)

Frequently asked questions

How long does it take to get my results back?
Results are typically available within 1 to 3 business days, depending on your lab’s processing time.
Can I eat or drink anything before this test?
No special preparation is needed. However, avoid excessive alcohol or large meals 2 hours before your blood draw if instructed.
Will I feel any pain during the blood draw?
Most people experience only a slight pinch or discomfort during the needle insertion, which usually fades quickly.
  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