Browse Medical Laboratory Calculators
CA 72-4 Unit Converter
Cancer Antigen 72-4 (CA 72-4) is a mucin-like glycoprotein tumor marker primarily associated with gastrointestinal and ovarian cancers. It is detected using two monoclonal antibodies (B72.3 and CC49) that bind to the TAG-72 (Tumor-Associated Glycoprotein 72) antigen.
Clinically, CA 72-4 is most valuable in the management of Gastric Cancer, where it often shows higher sensitivity and specificity than CEA or CA 19-9. It is also a useful second-line marker for Mucinous Ovarian Cancer (often elevated when CA 125 is normal) and Colorectal Cancer. Unlike many other markers, CA 72-4 is less frequently elevated in benign conditions, giving it a high specificity. Results are reported in Units per milliliter (U/mL) or kU/L. This converter allows seamless switching between these reporting standards.
SI Units
RecommendedUnits per milliliter (Standard Clinical Unit).
Conventional Units
Clinical Context
Reference Range: In healthy individuals, CA 72-4 is typically < 6.9 U/mL.
In gastric cancer, levels correlate with tumor stage and are useful for detecting post-surgical recurrence or peritoneal dissemination. In ovarian cancer, it is particularly sensitive for mucinous subtypes, which often do not express CA 125. The conversion factor is 1:1 for most standard units: 1 U/mL = 1 kU/L = 1 IU/mL.
Clinical References
How to Use This Calculator
Follow these steps to get accurate clinical conversions instantly.
Enter Values
Input your laboratory results into the corresponding unit field (e.g., U/mL). You can use either dot or comma decimals.
Automatic Conversion
The calculator works in real-time. As you type in one field, all other units (like kU/L) are instantly updated.
Verify Units
Check the SI Units section. Note that U/mL and kU/L are numerically identical.
Reset
Use the Clear button to reset all fields before starting a new calculation.
Frequently Asked Questions & Tips
CA 72-4 is defined by its antibody binding reactivity, not by weight. There is no standard conversion to mass.
Yes, “Units” and “International Units” are used interchangeably for this assay.