What are the limitations of the dic score?

While the dic score is highly validated, it should not replace clinical judgment. OpiCalc provides the latest evidence-based limitations for the dic score to ensure safe bedside use and optimal diagnostic accuracy.

How does the dic score compare to other hematology scores?

The dic score is a gold-standard diagnostic tool. OpiCalc provides side-by-side clinical guidance to help clinicians choose the most specific evidence-based tool for their patient's presentation.

Is the dic score free to use?

Yes. OpiCalc provides the dic score completely ad-free and optimized for mobile bedside use, ensuring you can calculate medical risk swiftly and without distraction.

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DIC Score (ISTH)

ISTH DIC Score: Standardized diagnostic criteria for overt Disseminated Intravascular Coagulation. Requires an underlying disorder associated with DIC.

Platelets (× 10³/µL)

D-dimer / FDP Increase

PT Prolongation (sec)

Fibrinogen (g/L)

Cumulative DIC Score

0

Non-Overt / No DIC

Score < 5. Suggest repeat labs in 24 hours if clinical condition worsens.

Guidelines & Evidence

Clinical Details

Section 1

When to Use

Clinically suspected Disseminated Intravascular Coagulation (DIC) in patients with an underlying disorder known to be associated with DIC (e.g., sepsis, trauma, malignancy, obstetric complications).

To objectively verify the presence of overt (decompensated) DIC.

Monitoring disease progression and response to treatment in critical illness.

Patient Population

Applicable only to patients who have an "underlying disorder" associated with DIC. Without an established trigger, the score has no diagnostic utility.

When Not to Rely on This Score Alone

Non-overt (compensated) DIC — requires a separate scoring system for early phase detection.

Chronic DIC — often seen in malignancy/aneurysms; laboratory parameters may be normal or near-normal despite consumption.

Liver failure — low platelets and high PT may reflect impaired synthesis rather than consumptive coagulopathy (though they often co-exist).

Section 2

Formula & Logic

Scoring Variables

Variable	Criteria	Weight
Platelets (× 10³/µL)	> 100	0
	50 - 100	1
	< 50	2
PT Prolongation (sec)	< 3	0
	3 - 6	1
	> 6	2
Fibrinogen (g/L)	> 1.0	0
	< 1.0	1
Soluble Fibrin / D-dimer	No increase	0
	Moderate increase	2
	Strong increase	3

Section 3

Pearls/Pitfalls

The Fibrinogen Paradox

Fibrinogen is an acute-phase reactant. In many cases of sepsis, it may be elevated. A "normal" fibrinogen level in a patient with multi-organ failure and low platelets may actually represent a pathologically "low" level due to consumption.

Overt DIC Threshold

A score ≥ 5 is compatible with overt DIC. Sensitivity 91%, Specificity 97%. If the score is < 5, suggest repeating labs in 24 hours if clinical suspicion persists.

Section 4

Evidence Appraisal

Consensus Criteria

Towards definition, clinical and laboratory criteria, and a scoring system for disseminated intravascular coagulation.

Taylor FB et al. • Thrombosis and Haemostasis. 2001;86(5):1327-30.

View Source

Section 5

Literature

Development

The International Society on Thrombosis and Haemostasis (ISTH) Subcommittee on DIC developed this system to address the clinical ambiguity surrounding the diagnosis of "consumptive coagulopathy."

Last Comprehensive Review: 2026

Related Hematology Tools

Absolute Neutrophil Count

MCV-based Anaemia Algorithm

Mentzer Index

England & Fraser Index

Shine & Lal Index

Corrected Reticulocyte Count

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