Comprehensive Metabolic Panel (CMP) With FIB-4 (Fibrosis-4) Index
It checks kidney, liver, electrolytes, and glucose, then estimates liver fibrosis risk using FIB-4, with convenient ordering through Vitals Vault/Quest.
This panel bundles multiple biomarker tests in one order—your report explains how results fit together.
This test combines two useful ideas in one order: a Comprehensive Metabolic Panel (CMP), which is a broad snapshot of your electrolytes, kidney function, liver-related proteins and enzymes, and blood sugar, plus a calculated Fibrosis-4 (FIB-4) Index.
The CMP shows what your body is doing right now. The FIB-4 Index uses a few routine lab values (and your age) to estimate the likelihood of significant liver scarring (fibrosis). It does not diagnose liver disease by itself, but it can help you and your clinician decide what to do next.
If you are trying to make sense of mildly abnormal liver enzymes, metabolic risk factors, or a history of fatty liver, this pairing can be a practical starting point and a good way to track trends over time.
Do I need a Comprehensive Metabolic Panel With Fibrosis 4 Fib 4 Index test?
You might consider this test if you want a single blood draw that covers common “baseline” chemistry markers and also gives you a structured way to think about liver fibrosis risk. It is especially relevant if you have risk factors for metabolic dysfunction, such as higher waist circumference, prediabetes or type 2 diabetes, high triglycerides, or regular alcohol use.
It can also be helpful when you have symptoms that are nonspecific but common in metabolic or liver-related issues, such as persistent fatigue, nausea, poor appetite, right-upper-abdominal discomfort, swelling in your legs, or unexplained itching. Many people with early fatty liver disease feel fine, so risk-factor screening is often the reason it is ordered.
You may also benefit if you are monitoring known conditions (for example, chronic hepatitis, fatty liver, or chronic kidney disease), or if you take medications that can affect the liver, kidneys, or electrolytes. In those cases, repeating a CMP at clinician-directed intervals can help you catch changes early.
Your results are most useful when they are interpreted alongside your history, exam, and any imaging or additional labs your clinician recommends. This test supports clinician-directed care and follow-up planning; it is not meant for self-diagnosis.
CMP analytes are measured in a CLIA-certified lab; the FIB-4 Index is a calculated estimate based on age and routine lab values and is not a standalone diagnosis of liver fibrosis.
Lab testing
Order labs to measure Comprehensive Metabolic Panel with Fibrosis-4 (FIB-4) Index
from $16.99 at Quest Diagnostics
About 1 week
Schedule online — results typically within a week
Clear next steps
Guidance included, with follow-up care available
HSA / FSA
Eligible for pre-tax health spending accounts
Get this test with Vitals Vault
Vitals Vault lets you order a CMP with a calculated FIB-4 Index so you can move from “I’m not sure” to a clear set of numbers you can discuss with your clinician. You choose a nearby lab location, complete a standard blood draw, and then review your report with trend-friendly results.
If your numbers raise questions—such as elevated AST/ALT, a reduced estimated glomerular filtration rate (eGFR), or a higher FIB-4 score—PocketMD can help you organize what to ask next and what follow-up tests are commonly paired with these findings.
This is also a practical test to repeat after lifestyle changes, medication adjustments, or a period of reduced alcohol intake, because many CMP markers respond within weeks to months. When you recheck, you can focus on direction of change, not just a single “normal/abnormal” flag.
- Order online and test at a local lab location
- PocketMD helps you prepare next-step questions for your clinician
- Designed for trending results over time, not one-off snapshots
Key benefits of Comprehensive Metabolic Panel With FIB-4 Index testing
- Gives you a broad look at electrolytes, kidney function, liver-related markers, and glucose in one panel.
- Adds a structured liver fibrosis risk estimate (FIB-4) using routine lab inputs you may already be tracking.
- Helps put mildly elevated AST/ALT into context when fatty liver or chronic liver disease is a concern.
- Supports medication safety monitoring for drugs that can affect liver enzymes, kidney function, or potassium/sodium.
- Creates a baseline you can compare against after lifestyle changes, weight loss, or reduced alcohol intake.
- Can guide whether you may need additional liver evaluation (for example, imaging or specialist review) rather than guessing.
- Makes it easier to have a focused, data-based conversation using PocketMD and your clinician’s guidance.
What is a Comprehensive Metabolic Panel With Fibrosis 4 Fib 4 Index?
A Comprehensive Metabolic Panel (CMP) is a group of blood tests that measures electrolytes (like sodium and potassium), kidney filtration markers (like creatinine and blood urea nitrogen), blood sugar, and several liver-related proteins and enzymes (such as albumin, bilirubin, alkaline phosphatase, AST, and ALT). It is commonly used for routine health checks and for monitoring chronic conditions.
The Fibrosis-4 (FIB-4) Index is a calculation that estimates the likelihood of significant liver fibrosis (scarring). It typically uses your age, AST, ALT, and platelet count. When a CMP is ordered “with FIB-4,” the lab report may include the FIB-4 score as an added interpretive value, but the score is still only as good as the inputs and the clinical context.
FIB-4 is most often used as a screening and triage tool. A lower score generally suggests a lower likelihood of advanced fibrosis, while a higher score suggests you may need additional evaluation. It does not replace imaging (such as elastography) or a clinician’s assessment, and it can be misleading in certain situations (for example, acute illness that temporarily raises AST/ALT).
What the CMP tells you about “metabolic” health
Despite the name, a CMP is not only about metabolism. It helps you see hydration and electrolyte balance, kidney filtration, and liver function signals. For example, creatinine and eGFR relate to kidney filtration, while albumin and bilirubin can reflect liver synthetic and processing functions (among other causes).
What the FIB-4 Index is trying to estimate
Fibrosis is scar tissue that can build up in the liver over time from chronic injury (such as fatty liver disease, viral hepatitis, or alcohol-related liver disease). FIB-4 uses patterns in AST and ALT (liver enzymes) plus platelet count (which can fall in more advanced liver disease) to estimate the chance of more significant fibrosis.
What do my Comprehensive Metabolic Panel With FIB-4 Index results mean?
Low (below-range) findings
“Low” on a CMP can mean different things depending on the marker. Low sodium can occur with overhydration, certain medications, or hormone-related conditions, while low potassium can happen with vomiting/diarrhea or diuretic use. Low albumin may reflect inflammation, poor protein intake, kidney protein loss, or liver disease, and it usually needs context rather than a quick conclusion. A low FIB-4 score generally suggests a lower likelihood of advanced liver fibrosis, but it does not rule out fatty liver or early-stage disease.
In-range (optimal) findings
When CMP values are in range, it suggests your electrolytes, kidney filtration markers, glucose, and liver-related proteins/enzymes are not showing obvious abnormalities at the time of testing. That is reassuring, especially if you are using the panel as a baseline. An in-range CMP does not guarantee there is no underlying condition, but it lowers the chance of major chemistry disturbances. A lower or “reassuring” FIB-4 score can support a watch-and-trend approach when your clinician agrees.
High (above-range) findings
High glucose can point toward diabetes or stress-related hyperglycemia, and it often triggers follow-up with A1c testing. Elevated creatinine or a lower eGFR can suggest reduced kidney filtration, but hydration status and muscle mass can affect these values. Elevated AST and ALT can occur with fatty liver, alcohol use, viral hepatitis, medication effects, or recent intense exercise, so the pattern and persistence matter. A higher FIB-4 score can suggest increased risk of significant fibrosis and may prompt additional testing (such as platelet review, hepatitis screening, iron studies, or liver imaging) rather than waiting.
Factors that influence CMP markers and the FIB-4 Index
Fasting status can affect glucose, and dehydration can concentrate some values and raise BUN. Recent strenuous exercise, muscle injury, or acute illness can temporarily raise AST and ALT, which can inflate a calculated fibrosis score. Many medications can shift electrolytes or kidney markers (for example, diuretics, ACE inhibitors/ARBs, NSAIDs, and some diabetes drugs), so it helps to review your medication list with your clinician. Because FIB-4 uses age as an input, the same enzyme values can produce different scores at different ages, which is one reason the score is used as a screening tool rather than a diagnosis.
What’s included
- Albumin
- Albumin/Globulin Ratio
- Alkaline Phosphatase
- Alt
- Ast
- Bilirubin, Total
- Bun/Creatinine Ratio
- Calcium
- Carbon Dioxide
- Chloride
- Creatinine
- Egfr
- Fib 4 Index
- Globulin
- Glucose
- Platelet Count
- Potassium
- Protein, Total
- Sodium
- Urea Nitrogen (Bun)
Similar tests to consider
Frequently Asked Questions
Do I need to fast for a CMP with FIB-4 Index?
Fasting is not always required for a CMP, but your clinician may prefer fasting if glucose interpretation is important or if you are pairing it with lipids. If you do not fast, your glucose may run higher after a meal, which can change how the result is interpreted. Follow the instructions provided with your lab order.
What is a “normal” FIB-4 score?
FIB-4 is usually interpreted using cutoffs that sort results into lower-risk and higher-risk ranges, and those cutoffs can vary by guideline and age group. Rather than focusing on a single universal “normal,” use the reference interpretation on your report and discuss what it means for your risk factors and symptoms. If your score is borderline or high, your clinician may recommend confirmatory testing instead of repeating FIB-4 alone.
Can a high AST or ALT from exercise affect my FIB-4 Index?
Yes. Intense exercise, muscle injury, or acute illness can temporarily raise AST (and sometimes ALT), which can make a calculated fibrosis score look higher than your usual baseline. If your enzymes were drawn soon after heavy training or during an illness, ask whether repeating the test after recovery makes sense.
Does an in-range CMP mean my liver is healthy?
Not necessarily. Many liver conditions—especially early fatty liver—can exist with normal or near-normal liver enzymes. The CMP provides useful signals (like AST, ALT, bilirubin, and albumin), but it does not directly measure liver fat or stiffness. If you have risk factors, your clinician may still recommend imaging or additional labs even when the CMP is in range.
How often should I repeat a CMP with FIB-4?
Retesting depends on why you are checking it. For medication monitoring or known kidney/liver conditions, your clinician may recommend intervals such as every few months. For lifestyle tracking (weight loss, reduced alcohol intake, improved glucose control), a recheck in about 8–12 weeks is common, but your situation may differ.
What follow-up tests are commonly ordered if my FIB-4 is high or my liver enzymes are elevated?
Common next steps include a complete blood count (CBC) to confirm platelet count, hepatitis B and C screening, iron studies (ferritin and transferrin saturation), and sometimes additional liver tests like GGT or INR. Imaging such as ultrasound or elastography may be used to assess fatty liver and fibrosis risk more directly. Your clinician chooses follow-ups based on your history, alcohol use, metabolic risk, and medication exposures.