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Coagulation

aPTT

Clotting time through the other pathway, the one that heparin and several inherited factor deficiencies affect.

Unit sTypical adult range 23–31.9 s
What it is

Clotting time through the other pathway, the one that heparin and several inherited factor deficiencies affect.

Why it matters

Read next to the prothrombin time it narrows down which part of the clotting cascade is involved.

Reading the number

An underfilled or slowly drawn tube prolongs it artefactually, which is the commonest reason for an unexpected result. Repeat before reading anything into one value.

What moves it
heparinsample handling and tube fillliver functionlupus anticoagulant
Read alongside
Prothrombin timeINRFibrinogen
When to raise it

Worth discussing a prolonged value that repeats on a clean sample.

Tracking only, not a diagnosis. The range above is a typical adult reference range — the range printed by the lab that ran your test is the one that applies to you. Discuss anything that concerns you with your doctor.

Also known as

On a report in another language.

A lab report names this analyte in its own language. Vitals Vault recognises each of these and files them all under aPTT.

T de Tromboplastina Parcial activ.(aPTT)Tempo de Tromboplastina Parcial activadoTTPa

Track your aptt over time.

aPTT is one of 165 analytes Vitals Vault charts over time. Import a lab report in any language and this number lands on a timeline only you can read.

Continue with Google
Tracking only. This app is not medical advice. Always discuss results and future analysis with your doctor.

Catalog entry last updated 2026-08-28. Browse all 165 metrics.