What is C4 complement factor?

C4 complement factor (Complement component 4) is a protein in the classical pathway of the immune system. It helps fight infections, clears immune complexes, and is measured in blood tests to detect autoimmune or inflammatory conditions.

What does a low C4 complement factor level mean?

Low C4 complement factor levels may suggest systemic lupus erythematosus (SLE), hereditary angioedema, chronic infection, or other autoimmune disorders. Always consult your doctor for interpretation.

What does a high C4 complement factor level mean?

High C4 complement factor levels are less common but can be seen in acute inflammation, infections, or certain immune responses. Interpretation should be done alongside other clinical findings.

What is the normal range for C4 complement factor?

Typical adult reference ranges for C4 complement factor are 16–48 mg/dL (0.16–0.48 g/L). These ranges may vary depending on the laboratory.

How do I use the C4 complement factor calculator?

Enter your C4 complement factor lab value, select the unit (mg/dL, g/L, mg/100mL, mg%, or mg/mL), and press calculate. The tool converts the value into all units and shows whether it is low, normal, or high.

Why convert C4 complement factor values between units?

Different labs may report C4 complement factor results in different units. The calculator standardizes these results into mg/dL and g/L for easier comparison and understanding.

Can the C4 complement factor calculator diagnose diseases?

No. The C4 complement factor calculator is for educational purposes only. It helps interpret lab values, but only a qualified healthcare provider can diagnose or treat medical conditions.

What are the equivalent reference ranges for C4 complement factor?

The standard adult reference range for C4 complement factor is 16–48 mg/dL. Equivalent values are 0.16–0.48 g/L, 16–48 mg/100mL, 16–48 mg%, and 0.160–0.480 mg/mL.

Free c4 Complement factor calculator

Need to check your C4 complement levels and quickly see if they fall within the normal range? Our C4 Complement Factor Calculator converts between units and interprets results instantly, helping you understand lab values with ease.

What is a C4 Complement Factor Calculator?

The C4 Complement Factor Calculator is a medical conversion and interpretation tool designed for lab test results. It lets you enter your measured C4 protein value in either mg/dL or g/L, automatically converts the units, and compares the result against a reference range. With this calculator, patients and clinicians can better understand C4 complement results without manual conversions.

What is the C4 Complement Factor?

Complement component 4 (C4) is a protein in the immune system’s classical pathway. It helps fight infection by binding to microbes and forming part of the C3 convertase enzyme complex. C4 is commonly measured in blood tests to evaluate immune activity. Low C4 levels may suggest autoimmune diseases like lupus or hereditary angioedema, while high levels can indicate inflammation or acute infection.

How the C4 Calculator Works

Behind the scenes, the calculator performs quick unit conversions and compares results with reference values:

Unit Conversion

Lab reports may list C4 in either mg/dL or g/L. Since 1 g/L = 100 mg/dL, the calculator instantly converts one unit to the other for clarity.

Reference Range Comparison

The calculator uses a default adult reference range of 16–48 mg/dL (0.16–0.48 g/L). These values can be edited depending on your lab’s standards. The tool then classifies your result as Low, Normal, or High.

How to Use the C4 Complement Calculator

Enter your lab result into the calculator.
Select the unit (mg/dL or g/L).
Press “Convert” to view the equivalent value in both units.
Check the interpretation versus the reference range.

What C4 Results Tell You

Low C4: May be linked to lupus, autoimmune disease, hereditary angioedema, or chronic infection.
Normal C4: Suggests immune system balance within expected lab values.
High C4: Can occur with acute inflammation or certain infections.

Real-Life Examples of C4 Calculator Use

Example 1: Lab result = 0.20 g/L ? Calculator converts to 20 mg/dL. Interpretation: Normal (within 16–48 mg/dL).
Example 2: Lab result = 10 mg/dL ? Calculator flags Low C4 compared to reference.
Example 3: Lab result = 60 mg/dL ? Calculator flags High C4 above reference.

C3 vs C4 Complement Tests

While C4 is important, doctors often order both C3 and C4 complement tests together. This gives a fuller picture of immune activity. For example:

Low C3 and Low C4: May suggest lupus or immune complex disease.
Normal C3 with Low C4: May point to hereditary angioedema.

Why Use Our C4 Complement Factor Calculator?

Fast: Converts values instantly.
Accurate: Uses standard medical conversion factors.
Flexible: Lets you edit reference ranges based on your lab report.
Helpful: Provides quick interpretation without manual calculation.

Use the C4 Complement Factor Calculator to better understand your lab test results. It’s simple, reliable, and designed to give patients and healthcare professionals clarity at a glance.

C4 Complement factor calculator