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The FIB-4 test is one of the most reliable and accessible tools for evaluating liver health without invasive procedures. Using standard lab results—AST, ALT, platelet count, and age—you can calculate your own fib 4 score to estimate your risk of liver fibrosis. With Ulta Lab Tests, you can order these labs individually and use our fib 4 calculator to easily determine your fib 4 value from home.
The FIB-4 Index helps identify early signs of liver damage caused by conditions such as fatty liver disease (NAFLD), hepatitis, or alcohol-related liver injury. Because it’s based on simple blood tests, the fib 4 score offers a convenient, cost-effective, and evidence-based way to monitor your liver health and guide follow-up testing when needed.
Fortunately, science offers a simpler, non-invasive tool: the FIB-4 Index. This clinically validated formula uses common blood test results to estimate your risk of liver fibrosis and guide next steps in care.
The FIB-4 Index, also known simply as fib 4, is a clinically validated formula used to estimate the amount of scarring or fibrosis in the liver. It combines four simple factors—age, AST (Aspartate Aminotransferase), ALT (Alanine Aminotransferase), and platelet count—to produce a fib 4 score that helps determine whether you may have liver damage.
Originally developed to evaluate patients with chronic hepatitis C, the FIB-4 Index is now widely used for non-alcoholic fatty liver disease (NAFLD), NASH, alcohol-related liver disease, and other metabolic conditions that affect the liver. The test has been endorsed by many healthcare professionals as a non-invasive alternative to biopsy for assessing fibrosis risk.
You can calculate your fib 4 score instantly using Ulta Lab Tests’ free fib 4 calculator, available to anyone who orders the individual components—AST, ALT, and platelet count. This makes the FIB-4 Index a practical first step for monitoring liver health and deciding whether additional tests, such as the Enhanced Liver Fibrosis (ELF) Score, may be needed.
The Fibrosis-4 (FIB-4) Index is a diagnostic formula used to help evaluate the extent of liver fibrosis — or scarring — based on routine lab results. Originally developed to assess patients with hepatitis C, it is now widely used for a variety of liver conditions, including:
The FIB-4 Index provides a fast, affordable, and non-invasive way to screen for potential fibrosis using blood tests that can be performed at any standard laboratory.
The FIB-4 formula is what allows you to calculate your own fib 4 score using common blood test results. This simple, non-invasive equation has become a trusted tool for assessing liver fibrosis risk in both clinical and at-home testing environments.
The FIB-4 Index is calculated using four factors: age, AST, ALT, and platelet count.
Your fib 4 value is calculated by multiplying your age by your AST result, then dividing that number by your platelet count multiplied by the square root of your ALT level.
If math isn’t your strong suit, you can use our free fib 4 calculator on the Ulta Lab Tests website to instantly compute your fib 4 score once you have your lab results. This calculator helps patients and providers quickly identify potential liver fibrosis risks without needing specialized software or clinical systems.
Because the FIB-4 Index uses such readily available lab data, it has become one of the most widely used and cost-effective screening tools for liver health and fibrosis detection.
Let’s look at an example using typical lab values:
Step 1: Plug in the numbers
Step 2: Calculate
Result:
The FIB-4 Index = 1.69
Once you’ve used your lab results or the Ulta Lab Tests fib 4 calculator to determine your fib 4 score, the next step is understanding what those numbers mean for your liver health. The FIB-4 Index provides clear, research-backed cutoff values that help indicate whether liver fibrosis is likely or whether further testing may be needed.
| FIB-4 Score Range | Interpretation | What It Means |
|---|---|---|
| Less than 1.30 | Low likelihood of fibrosis | Your liver function appears healthy, with minimal risk of scarring. Continue maintaining a healthy lifestyle and routine checkups. |
| 1.30 – 2.67 | Intermediate zone | Your fib 4 score falls in a range where results are uncertain. You may want to review your results with a healthcare provider or consider additional tests, such as an ELF Score or FibroScan. |
| Greater than 2.67 | High likelihood of advanced fibrosis | A high FIB-4 score suggests a greater risk of liver scarring or damage. Further evaluation by a healthcare provider is strongly recommended. |
When using the fib 4 calculator, keep in mind that results may vary slightly based on age and other health factors. That’s why Ulta Lab Tests encourages reviewing your FIB-4 Index and related lab results with a qualified medical professional or through our optional virtual consultation service.
Understanding your FIB-4 result is an empowering first step toward protecting your liver health. It helps you decide whether lifestyle changes, follow-up testing, or specialist care may be appropriate for your situation.
The great news about the FIB-4 Index is that you don’t need an expensive or specialized panel to determine your fib 4 score. You can calculate it yourself by ordering three simple, affordable blood tests from Ulta Lab Tests and then using our free fib 4 calculator to get your results instantly.
After you receive your results, simply enter your age, AST, ALT, and platelet count values into the fib 4 calculator to determine your fib 4 score. This number provides a reliable estimate of your liver fibrosis risk and can help you decide if additional tests—such as the Enhanced Liver Fibrosis (ELF) Score—are needed.
When you order these tests individually or as part of the FIB-4 Index Liver Health Evaluation (Self Calculation) bundle, you stay in control of your testing and costs. Unlike the Quest Diagnostics FIB-4 Panel with Reflex to ELF, which automatically runs the ELF test if your FIB-4 score is ≥1.30, Ulta Lab Tests allows you to review your fib 4 results first—before deciding if you want to move forward.
This approach gives you more flexibility, transparency, and peace of mind while still providing the same accurate data used by healthcare professionals nationwide.
The FIB-4 Index has become one of the most trusted tools for evaluating liver health because it combines clinical accuracy with accessibility. Unlike imaging scans or liver biopsies, the fib 4 test is non-invasive, cost-effective, and based on routine blood work that many people already have on file.
By calculating your own fib 4 score using our free fib 4 calculator, you can take proactive steps to understand your liver health before symptoms appear. Early detection of fibrosis can make a major difference in outcomes for conditions such as:
The FIB-4 is widely recommended by healthcare professionals as a first-line screening test for liver fibrosis. It’s especially valuable for individuals with metabolic risk factors—like high cholesterol, obesity, or diabetes—who may not yet show signs of liver disease.
With Ulta Lab Tests, you can easily access your lab results online, use the fib 4 calculator to interpret your FIB-4 score, and discuss your findings with a healthcare provider or through our virtual consultation service.
In short, the FIB-4 Index empowers you to take charge of your health through early awareness, clinical insight, and data-driven decision-making—all without the complexity or cost of traditional hospital testing.
When ordering a FIB-4 test through major reference labs, it’s important to understand how reflex testing works—especially if you want to control your costs. Many labs, such as Quest Diagnostics, offer a FIB-4 Index Panel with Reflex to Enhanced Liver Fibrosis (ELF) Score. While convenient, this setup automatically triggers the ELF test if your fib 4 score is 1.30 or higher, adding an additional charge.
At Ulta Lab Tests, you have a smarter option. By ordering the FIB-4 Index Liver Health Evaluation (Self Calculation) or the individual component tests—AST, ALT, and Platelet Count—you can calculate your own fib 4 score using our free fib 4 calculator. This lets you review your results first and then decide if you want to move forward with further testing, such as the ELF Score or imaging studies.
By choosing Ulta Lab Tests, you get the same clinical accuracy as major laboratories but with greater flexibility, lower costs, and complete transparency.
Once you’ve calculated your fib 4 score using the Ulta Lab Tests fib 4 calculator, the next step is understanding what to do with that information. The FIB-4 Index is a powerful early-screening tool, but it’s not a diagnosis — it’s a signal that helps guide informed next steps for your liver health.
A fib 4 score below 1.30 generally indicates a low likelihood of liver fibrosis. Continue maintaining a healthy lifestyle — balanced diet, limited alcohol intake, regular exercise, and routine health checkups. You can retest periodically to monitor changes over time.
Scores in this range fall into what’s called the indeterminate zone. While this doesn’t confirm fibrosis, it means additional evaluation may be beneficial. Consider discussing your FIB-4 result with a healthcare provider, who may recommend more specific assessments such as the Enhanced Liver Fibrosis (ELF) Score, FibroScan, or advanced imaging.
A high fib 4 score suggests a greater likelihood of significant liver scarring or advanced fibrosis. You should contact a physician or specialist for further testing and medical review. Early detection through the FIB-4 Index can make a meaningful difference in preventing progression to cirrhosis or other liver-related complications.
Taking proactive action based on your FIB-4 result helps you protect your liver health, manage risks early, and make evidence-based decisions — all with the convenience and transparency of Ulta Lab Tests.
The FIB-4 Index is one of the most valuable, evidence-based tools available today for monitoring liver health. By combining common lab results—AST, ALT, platelet count, and age—you can calculate your own fib 4 score using Ulta Lab Tests’ free fib 4 calculator.
Unlike invasive biopsies or costly imaging, the FIB-4 provides a quick, affordable, and non-invasive way to screen for early signs of liver fibrosis. Whether you have fatty liver disease, hepatitis, or simply want to stay proactive about your wellness, the fib 4 formula gives you clinically meaningful insights you can act on.
With Ulta Lab Tests, you can:
Protect your liver and gain clarity about your health with one simple step.
👉 Order the FIB-4 Index Liver Health Evaluation (Self Calculation)
Includes AST, ALT, and Platelet Count — everything you need to calculate your FIB-4 score and take charge of your liver wellness.
The FIB-4 Index, also called the fib 4, is a clinically validated formula that estimates the amount of scarring (fibrosis) in your liver using four simple factors: age, AST, ALT, and platelet count. It helps determine whether you may have early or advanced liver fibrosis without the need for a biopsy.
The FIB-4 test combines results from three common blood tests — Aspartate Aminotransferase (AST), Alanine Aminotransferase (ALT), and Platelet Count — along with your age. These values are used to calculate your fib 4 score, which indicates your likelihood of liver fibrosis.
You can easily calculate your fib 4 score using this formula:FIB-4=Age (years)×AST (U/L)Platelet Count (10⁹/L)×ALT (U/L)FIB-4=Platelet Count (10⁹/L)×ALT (U/L)Age (years)×AST (U/L)
Or simply enter your results into Ulta Lab Tests’ free fib 4 calculator, which will instantly compute your fib 4 value.
| FIB-4 Range | Interpretation |
|---|---|
| < 1.30 | Low likelihood of significant fibrosis |
| 1.30 – 2.67 | Indeterminate range; further testing may be needed |
| > 2.67 | Suggestive of advanced liver fibrosis |
Your fib 4 score helps you and your healthcare provider decide whether more advanced tests, such as the Enhanced Liver Fibrosis (ELF) Score, are needed.
When you order the FIB-4 Index Liver Health Evaluation (Self Calculation) through Ulta Lab Tests, you can review your fib 4 results before deciding whether to pursue additional testing.
Other labs, such as Quest Diagnostics, may automatically perform a reflex ELF test if your fib 4 score is ≥1.30 — adding a non-refundable charge. Ulta Lab Tests gives you full control and cost transparency.
Yes. The FIB-4 Index has been validated in multiple studies as a reliable non-invasive screening tool for detecting liver fibrosis, particularly in conditions like NAFLD, NASH, and viral hepatitis. While it doesn’t replace imaging or biopsy for definitive diagnosis, it’s an excellent first-line indicator of liver health.
Anyone at risk for liver disease can benefit from calculating their fib 4 score, especially individuals who have:
If your fib 4 score is normal (<1.30), retesting every 6–12 months is reasonable. If your score is elevated or borderline, follow your healthcare provider’s recommendations for repeat testing or further evaluation.
If your fib 4 score is greater than 2.67, it may suggest advanced fibrosis. Contact your healthcare provider for follow-up testing such as an ELF test, FibroScan, or imaging study. Ulta Lab Tests also offers virtual consultations where licensed clinicians can help interpret your results.
Yes. The Ulta Lab Tests fib 4 calculator is designed for anyone to use. Once your lab results are available, simply enter your age, AST, ALT, and platelet count to instantly view your FIB-4 score.
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