Ferritin ug/L To ng/mL Converter
Convert ferritin results between micrograms per litre and nanograms per millilitre with the exact one-to-one unit relationship shown clearly.
Convert Ferritin Units
Converted Ferritin Result
Ferritin has a one-to-one conversion between ug/L and ng/mL.
Why Ferritin ug/L And ng/mL Have The Same Number
Ferritin is a protein that stores iron, and ferritin blood results are often used alongside full blood count, transferrin saturation, iron studies, symptoms and medical history. Laboratories may write ferritin as ug/L, micrograms per litre, ng/mL or nanograms per millilitre. For ferritin concentration, 1 ug/L equals 1 ng/mL, so a result of 45 ug/L is also 45 ng/mL. The conversion is easy, but the clinical interpretation is not.
The unit conversion does not tell you whether a result is suitable for your age, sex, pregnancy status, inflammation level, endurance training load, iron treatment plan or long-term condition. Ferritin can rise with inflammation and liver disease as well as iron stores, and different laboratories use different reference intervals. If a report is flagged, read the flag and reference interval from the laboratory that performed the test rather than applying a range found elsewhere.
Formula And Method
Ferritin in ng/mL = ferritin in ug/L x 1.
Ferritin in ug/L = ferritin in ng/mL x 1.
1 microgram per litre = 1 nanogram per millilitre.
The equality works because one microgram is 1000 nanograms and one litre is 1000 millilitres. Both the mass and volume scale by the same factor, leaving the numerical concentration unchanged. The converter therefore keeps the value and changes only the displayed unit.
Quick Ferritin Conversion Table
| ug/L | ng/mL | How To Use The Row |
|---|---|---|
| 10 | 10 | Same number, different unit label. |
| 15 | 15 | Do not infer a diagnosis without the report range. |
| 30 | 30 | Often discussed in iron-store conversations, but context matters. |
| 45 | 45 | Example value used in the converter. |
| 100 | 100 | Conversion is unchanged at higher values. |
| 300 | 300 | Clinical review depends on the reason for testing. |
Worked Report Examples
UK Report To Article Unit
A laboratory report says ferritin is 45 ug/L. A journal article uses ng/mL. The converted value remains 45 ng/mL, so only the unit label changes.
US Report To UK Unit
A report from another country says 80 ng/mL. For a UK clinic letter using ug/L, write 80 ug/L. The number is identical.
Spreadsheet Cleanup
If a dataset has mixed ug/L and ng/mL ferritin columns, convert the unit labels first and keep the original source unit in a note so results are traceable.
Medical Boundary Notes
Ferritin is not a stand-alone diagnosis. A low ferritin may be considered alongside haemoglobin, mean cell volume, symptoms, diet, blood loss, menstrual history, pregnancy, coeliac disease, bowel symptoms or other tests. A raised ferritin may need a different review, especially if inflammation, infection, liver disease, alcohol intake, metabolic health or hereditary haemochromatosis is being considered.
Do not start, stop or change iron tablets because of this converter. Iron can cause side effects and may be harmful in some circumstances. If the result came from an NHS test, private blood test, fertility clinic, sports clinic or occupational health check, ask the requesting clinician how it should be read with the rest of the report. If symptoms are severe or new, seek medical advice promptly rather than waiting to compare units.
Common Mistakes With Ferritin Units
The most common mistake is trying to multiply or divide ferritin by 1000 because micrograms and nanograms sound far apart. That would be wrong for this concentration because the litre-to-millilitre change cancels the mass-unit change. Another mistake is copying a reference interval from a different laboratory after converting the unit. Reference intervals can differ by assay method and population, so the local report remains the primary guide.
A second practical mistake is mixing ferritin with haemoglobin or serum iron. Ferritin is commonly used as an iron-store marker, while haemoglobin describes oxygen-carrying red cells and serum iron can move during the day. These values can appear on the same blood report, but they do not share one conversion factor. If you are building a table for a clinician, keep each test name, unit and reference interval in its own column.
If you receive a private test and an NHS test with different units, convert the unit label first, then compare sample dates and clinical notes. A result taken after starting iron, during infection, after heavy bleeding or during an inflammatory flare may not be directly comparable with an older result.
FAQ
Is ferritin ug/L the same as ng/mL?
Yes. For ferritin concentration, 1 ug/L equals 1 ng/mL, so the numerical result stays the same.
Does this converter tell me if ferritin is low?
No. It converts units only. Use the reference interval on your laboratory report and speak to the clinician who requested the test.
Why does the number not change?
Micrograms to nanograms multiplies by 1000, while litres to millilitres also changes by 1000. The two changes cancel out.
Can I use this for serum iron?
No. Serum iron, transferrin saturation and other iron studies use different units and different formulas.
Should I convert before sending a result to my GP?
Usually you can send the report as it is. If you do convert, include both the original unit and converted unit to avoid confusion.
Can inflammation affect ferritin?
Yes. Ferritin can rise with inflammation and other conditions, which is why medical context matters.
Sources
- International Bureau of Weights and Measures. (2019). The International System of Units (SI), 9th ed. BIPM. https://www.bipm.org/en/publications/si-brochure
- Lab Tests Online UK. (n.d.). Ferritin. Lab Tests Online UK. https://labtestsonline.org.uk/tests/ferritin
- NHS. (n.d.). Iron deficiency anaemia. NHS. https://www.nhs.uk/conditions/iron-deficiency-anaemia/