Normal bleeding time
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Here is a complete summary of bleeding time from multiple authoritative sources:
Bleeding Time
Normal Values
| Method | Normal Range |
|---|---|
| Ivy method (template, forearm) | 1-9 minutes (most labs) |
| Duke method (fingertip puncture) | 1-6 minutes |
| Rosen's Emergency Medicine cutoff | < 8 minutes normal; 8-10 min borderline; >10 min abnormal |
How the Test is Performed
The standard (Ivy/template) method is performed on the volar (palmar) aspect of the forearm. A blood pressure cuff is inflated to 40 mmHg to ensure uniform intravascular pressure. A standardized disposable template makes a small incision (1 cm long, 1 mm deep). Bleeding is blotted every 30 seconds and the time until bleeding stops is recorded.
The older Duke method uses a sharp-pointed lancet to pierce the fingertip and records the time to cessation of bleeding (normal: 1-6 minutes), as described in Guyton & Hall.
What It Tests
Bleeding time is a global test of primary hemostasis - specifically:
- Platelet number and function (adhesion, aggregation, release)
- Vascular integrity
- von Willebrand factor (vWF) function
It is particularly prolonged by lack of platelets (thrombocytopenia) and platelet function disorders.
Clinical Limitations and Current Status
Bleeding time has been largely abandoned at most US hospitals for several reasons:
- Poor predictive value for clinical or surgical bleeding
- Large variability due to manual technique
- Affected by confounding factors: skin temperature, skin thickness, age, ethnicity, anatomic site
- Poor reproducibility
- Risk of scarring
- Does not reliably detect aspirin/antiplatelet medication effects, mild von Willebrand disease, or predict surgical bleeding
Modern Replacement
The PFA-100/200 (Platelet Function Analyzer) has largely replaced bleeding time. It measures "closure time" by flowing anticoagulated whole blood under high shear through a collagen/epinephrine or collagen/ADP-coated membrane. It is more sensitive for detecting moderate-to-severe vWD, medication-related platelet dysfunction, and severe platelet function disorders.
Bleeding time is not recommended as a preoperative screening test to assess bleeding risk. - Miller's Anesthesia, 10e
Sources:
- Guyton and Hall Textbook of Medical Physiology (fingertip method: 1-6 min)
- Rosen's Emergency Medicine (normal <8 min, abnormal >10 min)
- Henry's Clinical Diagnosis and Management by Laboratory Methods (largely abandoned, poor predictive value)
- Tietz Textbook of Laboratory Medicine, 7th Ed. (Ivy template method)
- Miller's Anesthesia, 10e (not recommended as preoperative screen)
- Quick Compendium of Clinical Pathology, 5th Ed. (antiquated, eliminated from most US hospitals)
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