8 Best Free Online FENa Calculator Websites

Here is a list of best free online FENa calculator websites. FENa (Fractional Excretion of Sodium) is a measurement to evaluate how well kidneys are working. To do that, it assesses the percentage of filtered sodium in urine. FENa calculation generates three main scenarios, first FENa <1% (indicates decreased blood flow to kidney), FENa between 1% to 3% (indicates intermediate range), and FENa > 3% (indicates intrinsic renal dysfunction). If you also want to calculate the FENa, then check out these online FENa calculator websites.

These websites help users calculate FENa in no time. To accurately calculate FENa, users need to provide four main values namely Urine Sodium, Urine Creatinine, Serum Sodium, and Serum Creatinine. After the calculation, these websites show FENa in percentage. Some calculators also show FENa in ratio and fraction units. Some websites also highlight the meaning of the obtained FENa results. These websites also explain FENa and show formulas to calculate FENa. The process to calculate FENa is also quite simple.

These websites have multiple medical calculators such as Creatinine Clearance, Renal Factor, Serum Osmolality, Adrenal Washout, Bladder Volume Calculator, and more. Go through the list to learn more about these websites.

My Favorite Online FENa Calculator Website:

omnicalculator.com is my favorite website as it calculates FENa and highlights the meaning of obtained FENa values. Plus, it explains FENa and shows the calculation formula.

You can also check out lists of best free Online Protein Creatinine Ratio Calculator, Online DPMO Calculator, and Online Fraction Calculator websites,

Comparison Table:

Features/Website Names	Calculates FENa value in percentage	Shows FENa calculation formula	Shows meaning of obtained FENa percentage
omnicalculator.com	✓	✓	✓
mdcalc.com	✓	✓	✓
med.cornell.edu	✓	✓	✓
msdmanuals.com	✓ (can also show FENa in ratio or fraction units)	✓	✓
pedriatriconall.com	✓ (shows FENa in percentage or ratio)	x	✓
reference.medscape.com	✓	x	✓
myendoconsultant.com	✓	✓	✓
cirrhosiscare.ca	x	x	✓

omnicalculator.com

omnicalculator.com is a free online FENa calculator website. Users can use this website to calculate FENa or Fractional Excretion of Sodium value in percentage. It helps doctors and physicians evaluate acute kidney failure and low urine output. It also helps doctors determine the status (pre-renal, post-renal, or intrinsic renal pathology) of kidneys. To perform this calculation, it needs accurate values of Creatinine, Sodium, Urine Creatinine, and Urine Sodium.

This website also shows FENa calculation formula and describes all involved elements. Besides this, it also helps users interpret the FENa results like FENa < 1% indicates Prerenal Cause, FENa between 1% to 4 % indicate Intrinsic Renal Cause, etc. Now, follow the below steps.

How to calculate FENa online using omnicalculator.com:

Visit this website and access the FENa calculator.
After that, enter the values of all four required parameters.
Next, view the calculated FENa value in percentage.

Additional Features:

This website has similar urology & nephrology calculators like Adernal Washout, Bladder Volume Calculator, Creatinine Clearance Calculator, Kidney Risk Failure, and more.

Final Thoughts:

It is one of the best free online FENa calculator websites as it calculates FENa in percentage and explains FENa in detail.

Pros	Cons
Calculates FENa value in percentage
Shows the meaning of different FENa percentages
Shows FENa calculation formula
Explains FENa

Home Page

mdcalc.com

mdcalc.com is a free online FENa calculator website. This website helps users calculate the percentage of Fractional excretion of sodium (FENa) in urine. This calculator also helps users determine if renal failure is due to pre-renal, intrinsic, or post-renal pathology. To calculate the FENa value, this calculator requires values of Serum Sodium, Serum Creatinine, Urine Sodium, and Urine Creatinine. Based on the provided values, it calculates and shows the FENa percentage and reason for renal failure if any. This calculator also shows the FENa calculation formula and figures associated with it. Now, follow the below steps.

How to calculate FENa online using mdcalc.com:

Visit this website and access the FENa calculator.
After that, enter values of Serum Sodium, Serum Creatinine, Urine Sodium, and Urine Creatinine.
Next, let this calculator perform the calculation.
Finally, view the calculated FENa percentage and reason for renal failure.

Additional Features:

This website offers multiple medical calculators and tools like Asthma Predictive Index, Anion Gap, Acute Gout Diagnosis Rule, Abuse Assessment Screen, Absolute Lymphocyte Count, and more.

Final Thoughts:

It is a good online FENa calculator website that calculates the percentage of FENa in urine and the reason for renal (kidney) failure.

Pros	Cons
Calculates the percentage of FENa in urine
Shows possible reason for Kidney failure

Home Page

med.cornell.edu

med.cornell.edu is another free online FENa calculator website. This website offers a simple FENa calculator that uses Urine Sodium, Urine Creatinine, Plasma Sodium, and Plasma Creatinine values to perform the FENa calculation. It shows the percentage of FENa based on the input values. It also highlights the formula that it uses to calculate the FENa value. This website also highlights the meaning of different FENa percentage values. Now, follow the below steps.

How to calculate FENa online using med.cornell.edu:

Visit this website and access the FENa calculator.
After that, enter all four input values.
Next, click on the Calculate button to start the calculation process.
Finally, view the calculated FENa percentage.

Additional Features:

This website has multiple medical calculators like Integrated Dosing Calculator, AlveolarGas Equation, Body Surface Area, Half-Life Calculator, and more.

Final Thoughts:

It is another good online FENa calculator website that helps users calculate the percentage of FENa in urine.

Pros	Cons
Calculates the percentage of FENa in urine
Shows the meaning of different FENa percentages

Home Page

msdmanuals.com

msdmanuals.com is another free online FENa calculator website. Through this website, users can calculate the Fractional Excretion of Sodium in percentage, fraction, and ratio units. It also shows the formula that it uses to calculate the FENa value. As input, it needs values of Urine Na, Serum Na, Urine Cr, and Serum Cr parameters. It also shows the meanings of different FENa percentages like FENa > 2% usually indicates ATN, FENa < 1% usually indicates a prerenal state, etc. Now, follow the below steps.

How to calculate FENa online using msdmanuals.com:

Go to this website and access the Fraction Excretion of Sodium value.
Now, enter all required values.
Next, specify the FENa calculation unit (percentage, fraction, or ratio).
Finally, view the calculated FENa value.

Additional Features:

This website has multiple clinical calculators like Body Mass Index, Cardiac Output, DVT Probability, M.I. Prediction Decision TreeCalc, and more.

Final Thoughts:

It is another good online FENa calculator website that calculates FENa values in percentage, fraction, and ratio units.

Pros	Cons
Can calculate FENa value in ratio, percentage, or fraction
Shows the meaning of different FENa percentages

Home Page

pedriatriconall.com

pedriatriconall.com is another free online FENa calculator website. This website offers multiple medical calculators including one FENa calculator. Like other similar websites, it also uses Urine Sodium, Urine Creatinine, Plasma Sodium, and Plasma Creatinine values to calculate the FENa value. After the calculation, it shows FENa value in both fraction and percentage values. It also shows the meaning of calculating FENa percentage values. Now, follow the below steps.

How to calculate FENa online using pedriaticconall.com:

Launch this website using the given link.
After that, enter all the required input values.
Next, click on the Calculate button to start the calculation process.
Finally, view the calculated FENa values in percentage and fraction values.

Additional Features:

This website has multiple renal calculators like Creatinine Clearance, Renal Factor, Serum Osmolality, Urine Anion Gap, and more.

Final Thoughts:

It is another standard online FENa calculator website that anyone can use to quickly calculate the FENa value.

Pros	Cons
Calculates percentage of FENa in percentage and fraction
Shows the meaning of different FENa percentages

Home Page

reference.medscape.com

reference.medscape.com is another free online FENa calculator website. Through this website, users can calculate the percentage of fractional excretion of sodium values in urine to evaluate kidney damage. To calculate FEMa, users need to have values of urine sodium, plasma sodium urine creatinine, and plasma creatinine. It also highlights what the calculated FENa percentage means. Now, follow the below steps.

How to calculate FENa online using revefrence.medscape.com:

Visit this website and open up the FEMa calculator section.
Now, enter the values of urine sodium, plasma sodium urine creatinine, and plasma creatinine elements.
Next, view the calculated FEMa value in percentage that users can copy.

Additional Features:

This website has multiple online calculators covering fields like Addiction Medicine, Cardiac Surgery, Critical Care, Hematology, Mental Health, and more.

Final Thoughts:

It is another capable online FENa calculator website that helps users calculate the percentage of FENa in urine.

Pros	Cons
Calculates FENa in percentage
Shows the meaning of different FENa percentages

Home Page

myendoconsultant.com

myendoconsultant.com is another free online FENa calculator website. This website offers a simple-to-use online FENa calculator website that quickly calculates the Value of FENa in urine. Users just need to submit the observed values of Plasma Sodium, Plasma Creatinine, Urine Sodium, and Urine Creatinine. Based on the input values, it calculates and shows the FENa in percentage. It also helps users interpret the meaning of FENa values. This website also highlights the FENa calculation formula and its elements. Now, follow the below steps.

How to calculate FENa online using myendoconsultant.com:

Visit this website using the given link.
After that, load enter values of Urine Creatinine, Urine Sodium, Plasma Creatinine, and Plasma Sodium.
Next, click on the Calculate FENa button.
Finally, view the calculate FENa in percentage.

Additional Features:

This website offers related calculators like Urine Protein Creatinine Ratio, Mean Arterial Pressure, Steroid Conversion, Adrenal Washout, etc.

Final Thoughts:

It is another standard online FENa calculator website that calculates the percentage of FENa and shows the calculation formula.

Pros	Cons
Shows FENa calculation formula

Home Page

cirrhosiscare.ca

cirrhosiscare.ca is the last free online FENa calculator website. This website helps users calculate the Fractional Excretion of Sodium (FENa) value in urine. Unlike other similar websites, it shows the FENa score and highlights the meaning (pre-renal, intrinsic, or post-renal) of the obtained FENa score. However, it doesn’t offer much information related to FENa. Now, check out the below steps.

How to calculate FENa online using cirrhosiscare.ca:

Go to this website and access the FENa calculator.
After that, enter Urine Sodium, Urine Creatinine, Plasma Creatinine, and Plasma Sodium values.
Finally, view the calculated FENa score and the meaning of that score.

Additional Features:

This website has multiple online tools like Total Tumor Volume, ALBI, itch Score, GAD-7, DAST-10, and more.

Final Thoughts:

It is another simple online FENa calculator website that anyone can use to quickly find out the FENa score and the meaning of the obtained score.

Pros	Cons
Shows the meaning of the FENa score	Lacks information related to FENa

Home Page

Frequently Asked Questions

How do you calculate fractional excretion of sodium?

Fractional excretion of sodium (FENa) is a measure of how well the kidneys are able to conserve sodium. It is calculated by taking the ratio of the amount of sodium excreted in the urine to the amount of sodium filtered by the kidneys. The formula for calculating FENa is: FENa = (Urine sodium × Serum creatinine)/(Serum sodium × Urine creatinine) × 100%.

How do you calculate excretion rate of sodium?

There are two main ways to calculate the excretion rate of sodium: First, using 24-hour urine collection: This is the most accurate method for calculating the excretion rate of sodium. It involves collecting all urine produced over a 24-hour period and then measuring the total amount of sodium in the collected urine. Second, using a spot urine sample and estimated creatinine clearance. This method is less accurate than the 24-hour urine collection but is often more convenient. It involves measuring the sodium concentration in a single spot urine sample and then estimating the glomerular filtration rate (GFR) using a calculator.

What is the formula for fractional excretion rate?

The formula for fractional excretion rate (FER) varies slightly depending on the substance being measured, but it generally follows this format: FER = (Substance Concentration in Urine / Substance Concentration in Blood) / Clearance Rate x 100%

What is normal FENa?

A normal FENa is considered to be less than 1%. This indicates that the kidneys are efficiently reabsorbing sodium and excreting an appropriate amount in the urine.

What is the fractional excretion ratio?

The fractional excretion ratio (FER or FE) is a measure of how well the kidneys are able to retain or excrete a particular substance from the blood. It is typically used to evaluate kidney function and diagnose kidney disease. FER is calculated by dividing the urinary excretion of a substance by the filtered load of that substance and multiplying by 100%. The filtered load is the amount of the substance that is filtered by the glomeruli, which are the tiny filtering units in the kidneys.

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