Calculator Form
Example Data Table
| Case | AST | ALT | ALP | Platelets | Likely Pattern |
|---|---|---|---|---|---|
| Sample A | 58 | 72 | 160 | 220 | Mixed tendency may appear |
| Sample B | 180 | 320 | 110 | 190 | Hepatocellular tendency may appear |
| Sample C | 48 | 52 | 420 | 260 | Cholestatic tendency may appear |
Formula Used
AST multiple of ULN = AST / AST upper limit.
ALT multiple of ULN = ALT / ALT upper limit.
ALP multiple of ULN = ALP / ALP upper limit.
AST/ALT ratio = AST / ALT.
R factor = (ALT / ALT upper limit) / (ALP / ALP upper limit).
APRI = ((AST / AST upper limit) / Platelets) x 100.
FIB-4 = (Age x AST) / (Platelets x square root of ALT).
Indirect bilirubin = Total bilirubin - Direct bilirubin.
MELD-Na estimate uses bilirubin, INR, creatinine, and sodium with safe caps for study use.
How to Use This Calculator
Enter current lab values from the same report when possible. Check the units before typing numbers. Add the upper reference limits shown by your laboratory. These limits may vary between laboratories. Press Calculate to review ratios, enzyme multiples, fibrosis scores, and pattern notes. Use CSV when you need a spreadsheet record. Use PDF when you need a printable summary. Review the result as a mathematical assessment. Do not use it as a diagnosis.
About Liver Function Assessment
Why These Markers Matter
A liver function assessment compares common laboratory markers with mathematical ratios. AST and ALT often reflect liver cell stress. ALP and GGT help review bile duct related patterns. Bilirubin shows pigment handling. Albumin and INR help describe synthetic function. Platelets may provide indirect fibrosis clues. No single number explains the full clinical picture.
Pattern Review
The R factor is useful because it compares ALT elevation with ALP elevation. A high R factor suggests a hepatocellular pattern. A low R factor suggests a cholestatic pattern. A middle value suggests a mixed pattern. This classification is only a guide. Symptoms, medicines, imaging, history, and repeat testing still matter.
Fibrosis Scores
APRI and FIB-4 are simple noninvasive score estimates. They use routine values, so they are easy to calculate. Low scores may suggest lower fibrosis probability. High scores may suggest stronger need for professional review. Intermediate results are common. They should be interpreted with clinical context and local guidelines.
Severity Estimate
The MELD-Na estimate uses bilirubin, INR, creatinine, and sodium. It is included for structured learning and comparison. The formula uses capped values to avoid unsafe math. It should not be used for treatment decisions without a qualified clinician. Urgent symptoms need urgent care.
Good Data Practice
Use values from one date whenever possible. Avoid mixing old and new reports. Match units carefully. Enter upper limits from your own lab sheet. Save results when tracking changes over time. Bring exported reports to a professional discussion if needed.
FAQs
1. What does this calculator assess?
It assesses liver related lab values with ratios, enzyme multiples, R factor, APRI, FIB-4, indirect bilirubin, and MELD-Na estimate.
2. Is this calculator a diagnosis?
No. It is an educational math tool. A clinician must interpret labs with symptoms, history, imaging, medicines, and repeat testing.
3. What is the R factor?
The R factor compares ALT elevation with ALP elevation. It helps classify hepatocellular, cholestatic, or mixed injury patterns.
4. What is APRI?
APRI is a fibrosis related estimate using AST, AST upper limit, and platelet count. It is only a screening style score.
5. What is FIB-4?
FIB-4 estimates fibrosis signal from age, AST, ALT, and platelets. Low, intermediate, or high ranges need clinical interpretation.
6. Why enter upper reference limits?
Laboratory reference limits vary. Using your report limits makes enzyme multiples and R factor calculations more relevant.
7. Can I export my results?
Yes. Use the CSV button for spreadsheet data. Use the PDF button for a simple printable report.
8. What should I do with abnormal results?
Do not self-diagnose. Discuss abnormal values with a qualified healthcare professional, especially if symptoms are present.