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CYFRA 21-1 Unit Converter
CYFRA 21-1 is a soluble fragment of cytokeratin 19, a protein found in the epithelial cells of the lung, bladder, and cervix. Elevated serum levels indicate increased turnover or damage of these cells.
Clinically, CYFRA 21-1 is the most useful serological tumor marker for **Non-Small Cell Lung Cancer (NSCLC)**, particularly the squamous cell carcinoma subtype. It is used to monitor treatment response, detect early recurrence, and estimate prognosis. While high specificity is desirable, levels can also be raised by benign lung diseases (pneumonia, tuberculosis) and hepatic/renal failure. Results are reported in mass units (ng/mL or $\mu\text{g/L}$) or International Units (IU/mL). This converter allows seamless switching between these reporting standards.
SI Units
RecommendedMicrograms per liter or Nanograms per milliliter (Numerically equivalent).
Conventional Units
Clinical Context
Reference Range: In healthy individuals, CYFRA 21-1 is typically < 3.3 ng/mL ($\mu\text{g/L}$).
Levels exceeding $30 \text{ ng/mL}$ in high-risk patients are highly suggestive of NSCLC. For post-treatment monitoring, a rising trend is more significant than a single absolute value. The conversion factor is simple: $\mathbf{1 \text{ ng/mL} = 1 \mu\text{g/L}}$. Molar units are not applicable due to the marker’s fragmented nature.
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., ng/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 $\mu\text{g/L}$ or $\text{pg/mL}$) are instantly updated.
Verify Units
Check the SI Units section. $\mu\text{g/L}$ and $\text{ng/mL}$ are numerically equivalent and are the standard mass units.
Reset
Use the Clear button to reset all fields before starting a new calculation.
Frequently Asked Questions & Tips
Yes. They are numerically identical. $\text{ng/mL}$ is often used in the US, $\mu\text{g/L}$ internationally.
The marker is a fragmented protein, meaning the molecular weight is undefined and unusable for reliable molar conversion.