Compatible Unit Probability Calculator

About Compatible Unit Probability Calculator

How many units to screen when antibodies need antigen-negative blood. The Compatible Unit Probability Calculator on Picscaler gives you the answer instantly in your browser, with no sign-up.

Inputs: Units needed, Antigen-negative frequency 1 (%), Antigen-negative frequency 2 (%) and Antigen-negative frequency 3 (%). Results shown: Chance a unit is compatible and Units to screen (about).

Formula: Combined % = f1 x f2 x f3 / 10,000; units to screen = units needed / (combined % / 100). Use the antigen-negative frequency for each antibody. A planning estimate only.

This tool is for education and information. It does not replace clinical judgement, so confirm results against your laboratory's reference ranges and local guidelines.

How to use Compatible Unit Probability Calculator

1. Enter Units needed, Antigen-negative frequency 1 (%), Antigen-negative frequency 2 (%) and Antigen-negative frequency 3 (%).
2. Press Calculate.
3. Read Chance a unit is compatible and Units to screen (about) in the result table.
4. Use the formula and notes under the result to check the working.

Frequently asked questions

Is Compatible Unit Probability Calculator free?

Yes. Compatible Unit Probability Calculator is completely free to use on Picscaler.

Do I need to create an account?

No. You can use it straight away without signing up.

Is my data safe?

Your input is processed in your browser on your own device and is not uploaded to Picscaler.

Can I use it for medical decisions?

No. It is an educational aid and does not replace professional medical judgement.