What are the limitations of the platelet increment calculator cci?

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

How does the platelet increment calculator cci compare to other Hematology scores?

The platelet increment calculator cci 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 platelet increment calculator cci free to use?

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

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Platelet Increment Calculator (CCI)

Corrected Count Increment (CCI): Adjusted for body size and transfused dose. A CCI > 7,500 at 1 hour post-transfusion indicates an adequate therapeutic response.

Pre-Plt (×10⁹/L)

Post-Plt (×10⁹/L)

BSA (m²)

Dose (×10¹¹ Plts)

(Standard adult unit ≈ 3.0)

Guidelines & Evidence

Clinical Details

Section 1

When to Use

Assessing the effectiveness of platelet transfusions.

Identifying Platelet Refractoriness in multi-transfused patients or those undergoing BMT/chemotherapy.

Distinguishing between "Immune" (HLA/HPA) and "Non-Immune" Causes of poor platelet increments.

Timing

CCI should ideally be measured 10–60 minutes post-transfusion. A second measurement at 18–24 hours can help differentiate causes (e.g., poor survival due to sepsis favors 24h drop).

Section 2

Formula & Logic

The CCI Formula

CCI = [Increment (×10⁹/L) × BSA (m²)] / Number of Platelets Transfused (×10¹¹)

Interpretation Thresholds

CCI Value	Category	Post-Transfusion Timing
> 7,500	Adequate Response	10 - 60 mins
< 5,000 to 7,500	Refractory	10 - 60 mins
< 4,500	Refractory	18 - 24 hours

Section 3

Pearls/Pitfalls

Immune vs. Non-Immune

Cause	Clinical Features	1h CCI	24h CCI
Immune (HLA)	Prior transfusions/pregnancies	Low	Low
Non-Immune	Sepsis, Fever, DIC, Splenomegaly	May be Normal	Low

The HLA Pivot

If a patient is refractory on two consecutive occasions (1h CCI < 5,000), HLA antibody screening and the provision of HLA-matched platelets should be considered.

Section 4

Evidence Appraisal

Primary Consensus

Platelet transfusion refractoriness.

Hod E et al. • British Journal of Haematology. 2008;142(3):348-60.

View Source

A guidelines-based approach to platelet refractoriness.

Meehan KR et al. • Cancer Control. 2001;8(2):113-20.

View Source

Section 5

Literature

Standard Units

A standard adult platelet pool (4-6 donors) or apheresis unit typically contains 3.0 × 10¹¹ platelets.

Last Comprehensive Review: 2026

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