What formula is used for platelet dosing?

The standard formula is: Units needed = (Target increment × Blood volume in liters) / (Platelets per unit × 10⁹). Blood volume defaults to 70 mL/kg. Platelets per unit defaults to 60 × 10⁹ for a pooled unit or single-donor apheresis concentrate.

What is the Corrected Count Increment (CCI)?

CCI = (Platelet increment × Body surface area) / Platelets transfused (×10¹¹). A 1-hour CCI ≥7.5 and a 24-hour CCI ≥4.5 are generally considered adequate responses. Low CCI suggests platelet refractoriness.

What platelet yield should I enter per unit?

A standard pooled platelet unit (4–6 whole-blood donations) contains approximately 240–360 × 10⁹ platelets total; divide that by units pooled to get per-unit yield. A single-donor apheresis unit typically contains 200–400 × 10⁹ platelets. The default in this tool is 60 × 10⁹, suitable for a single whole-blood-derived unit in a 4–6 unit pool calculation.

Is this tool suitable for pediatric patients?

This tool uses adult-oriented defaults (70 mL/kg blood volume). Pediatric dosing typically uses 5–10 mL/kg per unit and is weight-band-specific. Adjust the blood volume field accordingly, but always use institutional pediatric protocols.

Can I use this for clinical decision-making?

This tool is for educational and reference purposes only. Actual transfusion decisions must follow institutional protocols and be made by qualified clinicians with full access to patient history, indications, and contraindications.

Platelet Dose Calculator

Name: Platelet Dose Calculator
Availability: InStock
Author: Nham Vu

Calculate how many platelet units are needed to reach a target platelet count increment based on weight, blood volume, and yield per unit.

Patient Parameters

Patient Weight

Pre-transfusion Platelet Count (×10⁹/L)

Target Platelet Count (×10⁹/L)

Body Surface Area (m² — used for CCI)

Average adult ≈ 1.7–1.9 m². Use a BSA calculator if exact value needed.

Enter patient parameters and click Calculate to see results.

Summary

Calculate how many platelet units are needed to reach a target platelet count increment based on weight, blood volume, and yield per unit.

How it works

Enter the patient's weight in kilograms or pounds.
Enter the pre-transfusion platelet count (×10⁹/L).
Enter the target platelet count you want to reach (×10⁹/L).
Optionally adjust the blood volume per kg (default 70 mL/kg) and platelets per unit (default 60 × 10⁹ per unit for pooled or apheresis).
The calculator applies the standard formula to compute units needed and the expected post-transfusion increment.
The Corrected Count Increment (CCI) is shown to help evaluate adequacy of the transfusion.

Use cases

Estimate the number of platelet pools or apheresis units before a procedure.
Verify dosing calculations in clinical pharmacology coursework.
Cross-check manual platelet dose estimates during hematology training.
Evaluate whether a standard single-donor apheresis unit is sufficient for a given patient.
Calculate expected post-transfusion platelet counts for exam scenarios.
Support bedside decision-making in teaching hospitals (verify with institutional protocol).

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu