---
name: Early Hepatic Injury Detection via Coagulation Factors
description: Detect early liver dysfunction by analyzing vitamin K-dependent coagulation factors when albumin is normal but liver injury is suspected. Use this skill when evaluating patients with risk of early hepatocellular damage, cholestasis, or acute liver failure, especially if standard liver enzymes are inconclusive.
metadata:
  openclaw:
    emoji: "🫘"
    skillKey: "early-hepatic-injury-detection-via-coagulation-factors"
---

# Early Hepatic Injury Detection via Coagulation Factors

## When to Use This Skill
Use this skill **if**:
- A patient is suspected of early liver injury but serum albumin remains within normal range
- The patient has risk factors for liver dysfunction (e.g., drug exposure, viral hepatitis, alcohol use)
- Standard liver function tests are ambiguous or delayed in reflecting synthetic impairment
- You need to differentiate between cholestatic vitamin K deficiency and true hepatocellular synthetic failure

Do **not** use this skill for:
- Isolated thrombocytopenia
- von Willebrand disease
- Cases where vitamin K deficiency is clearly nutritional or iatrogenic without liver involvement

## How to Execute

1. **Confirm prerequisites**: Ensure the patient can undergo PT, APTT, TT, AT-III, and/or HPT testing.

2. **Interpret coagulation factor kinetics**:
   - Recognize that most coagulation and anticoagulant factors (except tissue factor and vWF) are synthesized in the liver.
   - Note that vitamin K–dependent factors (II, VII, IX, X) have short half-lives—especially factor VII (1.5–6 hours)—making them sensitive early markers.

3. **Perform screening tests**:
   - Order **PT** (prothrombin time): prolonged early in liver dysfunction
   - Consider **APTT**, **TT**, **AT-III**, and **HPT** (hepatic prothrombin time) for comprehensive assessment
   - HPT reflects combined activity of factors II, VII, and X and offers high sensitivity for early synthetic impairment

4. **Differentiate etiologies**:
   - If **PT prolongation corrects after vitamin K administration**, suspect **cholestasis-induced vitamin K malabsorption**
   - If **PT remains prolonged despite vitamin K**, suspect **hepatocellular synthetic failure**
   - Remember: Factor VIII is often normal or elevated in liver disease (acute-phase reactant); fibrinogen drops only in severe parenchymal damage

5. **Assess DIC risk** in advanced cases:
   - In cirrhosis or fulminant hepatic failure, monitor for concurrent DIC due to impaired synthesis of inhibitors, reduced clearance of activated factors, and release of procoagulants

6. **Generate clinical alert**:
   > If coagulation factor activity is reduced while albumin is normal, this indicates early hepatocellular synthetic dysfunction. If PT prolongation is vitamin K–correctable, it suggests cholestasis-related vitamin K deficiency rather than primary liver failure.