# How do you calculate APRI?

## How do you calculate APRI?

The formula for the APRI score is [(AST/upper limit of the normal AST range) X 100]/Platelet Count….How Is It Calculated?

- Divide your AST count by the upper limit of the normal AST range. Most experts say that 40 is a good value to use here.
- Multiply that answer by 100.
- Divide that answer by your platelet count.

## What is platelet ratio index?

Determines the likelihood of hepatic fibrosis and cirrhosis in patients with hepatitis C. Pearls/Pitfalls. Why Use. Patients with hepatitis C being considered for liver biopsy to determine chance of fibrosis or cirrhosis.

**What is top normal AST?**

The platelet count is measured in platelets/cubic millimeter. The upper limit of the normal range (ULN) of the AST, is usually set to 40 or 42 IU/L. The formula divides your AST by the Upper Limit of the Normal Range (40 or 42). Then it multiplies that result by 100.

**How accurate is APRI score?**

Interpretation: In a meta-analysis of 40 studies, investigators concluded that an APRI score greater than 1.0 had a sensitivity of 76% and specificity of 72% for predicting cirrhosis.

### How to calculate Apri for a platelet count?

■ Platelet count measured in 10 9 cells per L. The formula used to calculate the index is: APRI = AST (IU/L) / AST upper normal limit (IU/L) /Platelet count (10 9/L) x 100. The use of the index can reduce unnecessary liver biopsy investigations in patients who are deemed to carry a low risk of liver fibrosis.

### How to calculate the AST to platelet ratio index?

AST to Platelet Ratio Index (APRI) Calculator. APRI = AST Level (IU/L) AST (Upper Limit of Normal) (IU/L) Platelet Count (109/L) x 100 = Interpretation: In a meta-analysis of 40 studies, investigators concluded that an APRI score greater than 1.0 had a sensitivity of 76% and specificity of 72% for predicting cirrhosis.

**When to set a higher platelet count for women?**

Higher platelet count was set when platelet count >405 × 10 9 /L or >379 × 10 9 /L for women ≤64 or >64 years of age, respectively; and platelet count >362 × 10 9 /L or >350 × 10 9 /L for men ≤64 or >64 years of age, respectively (data from reference 9 ).

**How is the fib 4 platelet count calculated?**

Platelet count is used to identify whether there are sufficient clotting particles (those produced by liver) and thus indirectly test liver function. This score employs the following equation: FIB 4 = (Age x AST) / (Platelet count x √ALT)