Veterinary Blood Transfusion Volume Calculator
About this app
Free transfusion volume calculator. BW × blood volume × PCV gap over donor PCV.
Veterinary Blood Transfusion Volume Calculator Veterinary Blood Transfusion Volume Calculator How much donor blood to raise PCV. Not a drip-rate tool and not a canine shock-index clone. SpeciesSets default blood volume. Dog (90 mL/kg) Cat (60 mL/kg) Body weightkg Patient PCV% Target PCV% Donor PCV%. Whole blood often ~40%; packed RBCs are higher. Blood volume overridemL/kg. Leave blank to use the species default. Calculate volume Formula Volume (mL) = BW × blood volume × (PCV_target − PCV_patient) / PCV_donor Default blood volume: 90 mL/kg dog, 60 mL/kg cat. Rule of thumb (dogs, pRBC): about 2 mL/kg raises PCV by 1%. Shown as a check, not a replacement for the mass-balance formula. References DiBartola SP, ed. Fluid, Electrolyte, and Acid-Base Disorders in Small Animal Practice. Blood volume and transfusion volume formula. Wellman ML, DiBartola SP, Kohn CW. Applied physiology of body fluids in dogs and cats. In: DiBartola. Circulating blood volume ~90 mL/kg dog, ~60 mL/kg cat. Davidow EB, et al. Association of Veterinary Hematology and Transfusion Medicine transfusion consensus. pRBC 2 mL/kg ≈ 1% PCV in dogs as a teaching rule of thumb. Veterinary education only. Not a prescript...
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
<title>Veterinary Blood Transfusion Volume Calculator</title>
<meta name="description" content="Free transfusion volume calculator. BW × blood volume × PCV gap over donor PCV.">
<meta name="keywords" content="transfusion volume, PCV, packed cell volume, veterinary transfusion, dog cat blood, pRBC">
<style>
:root { --text:#1a1a1a; --muted:#4a4a4a; --line:#d6d6d6; --bg:#fff; --panel:#f6f6f6; }
html { -webkit-text-size-adjust:100%; text-size-adjust:100%; }
* { box-sizing:border-box; }
body {
margin:0;
font:16px/1.45 system-ui,-apple-system,sans-serif;
color:var(--text);
background:var(--bg);
overflow-x:hidden;
}
main {
max-width:720px;
margin:0 auto;
padding:24px 16px 48px;
padding-left:max(16px, env(safe-area-inset-left));
padding-right:max(16px, env(safe-area-inset-right));
}
html.in-viewer main {
padding-top:calc(4.25rem + env(safe-area-inset-top, 0px));
padding-right:calc(4.75rem + env(safe-area-inset-right, 0px));
padding-bottom:calc(6.5rem + env(safe-area-inset-bottom, 0px));
}
h1 { font-size:1.35rem; margin:0 0 0.35rem; }
h2 { font-size:1.05rem; margin:1.75rem 0 0.5rem; }
p, li { color:var(--text); }
.lede, .note, .disclaimer, label span { color:var(--muted); }
.lede, .disclaimer { font-size:0.95rem; }
label span { font-weight:400; font-size:0.85rem; }
form, .stack { display:grid; gap:14px; margin:1.25rem 0; }
fieldset {
border:1px solid var(--line);
border-radius:6px;
padding:12px;
display:grid;
gap:12px;
min-width:0;
}
legend { font-weight:600; padding:0 6px; }
label { display:grid; gap:4px; font-weight:600; }
.check { display:flex; align-items:center; gap:10px; font-weight:600; }
.check input { width:22px; height:22px; min-height:22px; flex:0 0 auto; }
input, select, textarea {
font:inherit;
font-size:16px;
min-height:44px;
padding:10px 12px;
border:1px solid var(--line);
border-radius:6px;
width:100%;
max-width:100%;
background:#fff;
}
button {
font:inherit;
font-size:16px;
font-weight:600;
width:100%;
min-height:48px;
padding:12px 14px;
border:0;
border-radius:6px;
background:#1a1a1a;
color:#fff;
cursor:pointer;
}
.result {
padding:16px;
background:var(--panel);
border:1px solid var(--line);
border-radius:6px;
}
.result strong { font-size:1.35rem; }
.parts { display:grid; gap:6px; margin-top:10px; font-size:0.95rem; }
pre.formula {
white-space:pre-wrap;
overflow-wrap:anywhere;
background:var(--panel);
border:1px solid var(--line);
border-radius:6px;
padding:12px;
font-size:0.9rem;
max-width:100%;
}
ol.refs { padding-left:1.25rem; }
ol.refs li { margin-bottom:0.6rem; }
a { color:inherit; }
.table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; max-width:100%; }
table { border-collapse:collapse; width:100%; font-size:0.9rem; }
th, td { border:1px solid var(--line); padding:8px; text-align:left; vertical-align:top; }
.muted { color:var(--muted); font-size:0.9rem; }
</style>
</head>
<body>
<main>
<h1>Veterinary Blood Transfusion Volume Calculator</h1>
<p class="lede">How much donor blood to raise PCV. Not a drip-rate tool and not a canine shock-index clone.</p>
<form id="calc-form">
<label>Species<span>Sets default blood volume.</span>
<select id="species">
<option value="90" selected>Dog (90 mL/kg)</option>
<option value="60">Cat (60 mL/kg)</option>
</select>
</label>
<label>Body weight<span>kg</span>
<input id="bw" type="number" min="0" step="any" inputmode="decimal" value="20">
</label>
<label>Patient PCV<span>%</span>
<input id="pcv" type="number" min="0" max="100" step="any" inputmode="decimal" value="15">
</label>
<label>Target PCV<span>%</span>
<input id="target" type="number" min="0" max="100" step="any" inputmode="decimal" value="25">
</label>
<label>Donor PCV<span>%. Whole blood often ~40%; packed RBCs are higher.</span>
<input id="donor" type="number" min="0" max="100" step="any" inputmode="decimal" value="40">
</label>
<label>Blood volume override<span>mL/kg. Leave blank to use the species default.</span>
<input id="bv" type="number" min="0" step="any" inputmode="decimal" placeholder="optional">
</label>
<button type="submit">Calculate volume</button>
</form>
<div class="result" id="result" hidden></div>
<h2>Formula</h2>
<pre class="formula">Volume (mL) = BW × blood volume × (PCV_target − PCV_patient) / PCV_donor
Default blood volume: 90 mL/kg dog, 60 mL/kg cat.
Rule of thumb (dogs, pRBC): about 2 mL/kg raises PCV by 1%.
Shown as a check, not a replacement for the mass-balance formula.</pre>
<h2>References</h2>
<ol class="refs">
<li>DiBartola SP, ed. <i>Fluid, Electrolyte, and Acid-Base Disorders in Small Animal Practice</i>. Blood volume and transfusion volume formula.</li>
<li>Wellman ML, DiBartola SP, Kohn CW. Applied physiology of body fluids in dogs and cats. In: DiBartola. Circulating blood volume ~90 mL/kg dog, ~60 mL/kg cat.</li>
<li>Davidow EB, et al. Association of Veterinary Hematology and Transfusion Medicine transfusion consensus. pRBC 2 mL/kg ≈ 1% PCV in dogs as a teaching rule of thumb.</li>
</ol>
<p class="disclaimer">Veterinary education only. Not a prescription. Confirm doses and volumes with the attending clinician and current formularies before use.</p>
</main>
<script>
if (window.self !== window.top) {
document.documentElement.classList.add('in-viewer');
}
function num(id) {
var el = document.getElementById(id);
if (!el) return 0;
var value = parseFloat(el.value);
return isFinite(value) && value > 0 ? value : 0;
}
function raw(id) {
var el = document.getElementById(id);
if (!el) return NaN;
var value = parseFloat(el.value);
return isFinite(value) ? value : NaN;
}
function sel(id) {
var el = document.getElementById(id);
return el ? el.value : '';
}
function showResult(html) {
var el = document.getElementById('result');
el.hidden = false;
el.innerHTML = html;
}
function fmt(value, digits) {
if (!isFinite(value)) return '—';
return value.toFixed(digits);
}
document.getElementById('calc-form').addEventListener('submit', function (event) {
event.preventDefault();
var bw = num('bw'), pcv = raw('pcv'), target = raw('target'), donor = num('donor');
var bv = num('bv') || parseFloat(sel('species'));
if (!bw || !donor || !isFinite(pcv) || !isFinite(target)) {
showResult('<p>Enter weight, patient PCV, target PCV, and donor PCV.</p>');
return;
}
if (target <= pcv) {
showResult('<p>Target PCV must be greater than patient PCV.</p>');
return;
}
var vol = bw * bv * (target - pcv) / donor;
var thumb = bw * 2 * (target - pcv);
showResult(
'<div>Transfusion volume</div><strong>' + fmt(vol, 0) + '</strong><span> mL</span>' +
'<div class="parts"><div>Blood volume used = ' + bv + ' mL/kg</div>' +
'<div>PCV gap = ' + fmt(target - pcv, 1) + ' points</div>' +
'<div>Dog pRBC thumb (2 mL/kg per 1% PCV) = ' + fmt(thumb, 0) + ' mL</div></div>' +
'<p class="note">Use the thumb only for canine packed red cells. Crossmatch and product type still apply.</p>'
);
});
</script>
</body>
</html>
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