When is a Hair Pull Test Considered Positive for Telogen Effluvium?
A hair pull test is considered positive for telogen effluvium when more than 2-3 hairs are extracted per pull from multiple areas of the scalp, including the occiput. 1
How to Perform the Test
The hair pull test is a simple bedside examination performed by:
- Gently grasping a group of 50-60 hairs between your fingers
- Pulling from the scalp surface to the hair ends with gentle traction
- Repeating this in 3-4 different areas of the scalp, including at least one pull from the occiput (back of the head) 1
Interpretation
Normal Result
- 0-2 hairs per pull is considered normal 1
Positive Result for Telogen Effluvium
- More than 2-3 hairs per pull suggests increased telogen shedding
- Crucially, the test must be positive in multiple areas of the scalp, including the occiput 1
- This diffuse pattern distinguishes telogen effluvium from female pattern hair loss (FPHL), where increased shedding occurs only in affected areas (frontal/central scalp) while the occiput remains normal 1
Key Clinical Distinctions
Telogen Effluvium Pattern
- Positive pull test from all scalp regions including the occiput
- Diffuse, global hair shedding
- No specific pattern of baldness 1
Female Pattern Hair Loss (FPHL) Pattern
- Positive pull test only in affected areas (frontal/central scalp)
- Occiput remains normal (0-2 hairs per pull)
- Patterned hair loss with miniaturization 1
Important Caveats
The pull test has limitations in sensitivity. Research shows the pull test is "poorly sensitive" compared to other methods like the wash test 2. A negative pull test does not rule out telogen effluvium, particularly in chronic cases where shedding may be intermittent.
In clinical practice, approximately 54.9% of patients with telogen effluvium had positive pull tests in one study 3, meaning nearly half had negative tests despite active disease. The test is most useful when positive across multiple scalp sites, confirming the diffuse nature of telogen effluvium versus localized hair loss conditions.
Higher positivity rates occur in chronic telogen effluvium compared to acute cases 4, so timing of the test relative to disease course matters.
The guideline evidence consistently defines the threshold as >2 hairs per pull from 50-60 hairs grasped, with the critical diagnostic feature being positivity across multiple scalp regions rather than just the absolute number of hairs extracted 1.