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Total Protein in Serum (or Plasma)

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

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

Quick summary

["Your blood protein levels can indicate overall health and help diagnose conditions like dehydration, liver disease, or kidney problems."]

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

Key facts at a glance

LOINC
44715-1
Short code
C4-SF
Synonyms
C4/Prot Snv
Category
chemistry
Sample
fluid
Container
Sterile, screw-capped, plain (red-top) tube or synovial fluid collection vial without anticoagulant for complement testing; avoid heparin tubes as heparin may interfere with complement assays.
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
Nephelometry
CPT
86161
SNOMED
116276005
Specimen volume
1-2 mL of synovial fluid (minimum 0.5 mL)
Stability
Room temperature: 2 hours; Refrigerated (2-8°C): 24 hours; Frozen (-20°C or below): up to 2 weeks. For best results, process and analyze as soon as possible after collection.
Hemolysis max
300
TAT
24–72 hours
Order
routine

Why Is This Test Done?

Doctors may order a total protein test to check for conditions affecting your liver, kidneys, immune system, or to monitor chronic diseases like kidney disease or certain cancers. It can also help diagnose dehydration or fluid imbalances.

What Does the Result Mean?

Results may be lower in cases of malnutrition, liver disease, or kidney problems, while higher levels might suggest conditions like multiple myeloma, severe dehydration, or certain inflammatory diseases.

How Is the Test Performed?

A blood sample is drawn from a vein, usually in your arm. The sample is sent to a lab where it is analyzed to measure the total protein content.

What Are Common Conditions Monitored?

This test is often used alongside other blood tests to diagnose or monitor conditions such as chronic kidney disease, liver disease, malnutrition, or to evaluate the effectiveness of treatments for certain diseases.

Reference range

Reference ranges for complement C4 in synovial fluid are not well-established; clinical interpretation should be made in conjunction with serum complement levels and total synovial fluid protein concentration. The C4/total protein mass ratio helps differentiate local synovial complement consumption from systemic changes.N/A

Specimen: fluid

No special patient preparation is required. Synovial fluid is collected via arthrocentesis by a qualified healthcare provider under aseptic technique.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormally low or high protein levels can signal serious health problems. Low protein levels may indicate poor nutrient absorption, liver or kidney disease, or severe infections. High protein levels might suggest conditions like multiple myeloma, severe dehydration, or certain autoimmune disorders. Always discuss results with your healthcare provider for accurate interpretation.

Short name

Total Protein

Frequently asked questions

What does a total protein test measure?
This test measures the combined amount of all proteins in your blood, including albumin and globulins, which play key roles in maintaining fluid balance, supporting immunity, and transporting nutrients.
How often should I get this test?
The frequency depends on your health condition and why the test was ordered. Your doctor will determine the best schedule based on your medical needs, such as monitoring chronic diseases or evaluating treatment responses.
Can diet affect my total protein test results?
Yes, diet can influence protein levels. Eating a balanced diet with adequate protein intake may help maintain normal levels, but extreme dietary changes or malnutrition can affect results. Always follow your doctor’s advice regarding diet and testing.
  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