Activated partial thromboplastin time (aPTT) — lab reference
In the reference guideReagent-specific. Heparin monitoring may use different targets or anti-Xa.
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What’s searchable?Reagent-specific. Heparin monitoring may use different targets or anti-Xa.
Reagent-specific. Interpret with INR, liver function, vitamin K, and anticoagulants.
Reagent-specific; affected by heparin, direct thrombin inhibitors, and fibrinogen abnormalities.
Collection method, tourniquet time, exercise, and timing affect result.
No universal reference or treatment target. Standardize fasting duration and collection time.
Fasting, time of day, inflammation, albumin, and trace-metal collection technique matter.
Collect at a defined time. Assay-specific; dynamic testing may be required.
Time-specific and assay-specific.
Sodium intake, posture, potassium, time, medications, and renin method are essential.
Morning fasting collection is preferred when practical. Day-to-day variation is substantial.
Interpret with iron, transferrin saturation, and ferritin.
Negative acute-phase reactant; affected by liver function and nutrition.
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