Hair Pattern Assessment

Written by the AfroHairClinicTurkey editorial team, drawing on the clinical experience of our medical team · Last updated September 3, 2026 · How we write and check this

On this page 5 sections
  1. What a curl pattern is, from the strand to the follicle
  2. The typing system is a vocabulary, not a measurement
  3. Curl is built into the follicle, not into ancestry
  4. Why a letter does not decide a surgical plan
  5. Frequently asked questions

What a curl pattern is, from the strand to the follicle

Afro Hair Lab

Understand your curl pattern

Explore how curl shape relates to the follicle beneath the skin — and why it matters for planning. Drag it, animate it, compare two patterns. Nothing about your own hair is measured here.

Drag along the spectrum — or use your arrow keys — to explore.

The strand, magnified

One strand, shown much larger than life. Illustrative magnification — not a measurement.

On the head

How that same pattern reads on the head.

Beneath the skin

SKINthe hair you seethe follicle you don’t

Illustration of a general pattern — not your hair. In tightly curled hair the follicle sits curved beneath the skin rather than straight, with a bent, golf-club-shaped bulb and an asymmetric root sheath. This is a broad association across ethnic backgrounds; it does not measure anything about your own follicles.Source: Br J Dermatol 2005; Int J Dermatol 2007

See a curved follicle meet the extraction tool →

Why it reads the way it does

The single label is really three things moving together. Watch them as you drag.

Loop spacingwidetight
Curl shaperoundedangular
Visible shrinkagelessmore

As the curl tightens, the follicle beneath it curves more — which is exactly why curl pattern comes into surgical planning at all.

The Lab shows the hair you can see, plus a general illustration of the follicle beneath it. It doesn’t diagnose, doesn’t judge a pattern as better or worse, and doesn’t measure anything about you.

Hair Pattern Assessment

Now find your own pattern

A few questions about the hair you can see and touch — and what that can, and cannot, tell us for Afro hair transplantation. No photo, no upload; it runs entirely in your browser.

How this works, and what it can’t tell you — read the methodology →
Q1 · How wide is a single loop of your curl or coil?

Look at one curl on its own — the width of the loop it makes, not how long the hair is.

Loop width is the clearest single signal of how tight the pattern is.

Q2 · What shape does the hair make — smooth curves or sharp bends?

Follow one strand with your eye from root to tip.

Rounded “S” curves sit toward the curl end; sharp “Z” angles toward the coil end.

Q3 · How defined are your curls when wet versus dry?

Wet a small section, let it dry untouched, and compare.

How much the curl “shows itself” versus reading as overall texture. Appearance only.

Q4 · When you gently stretch one strand and let go, what does it do?

Take a single strand, stretch it a little, and release.

The shape a strand returns to tells a round, springy coil from an angular one.

Q5 · How much shorter does your hair look unstretched than pulled straight?

Compare the length hanging naturally to the length when gently pulled straight (“shrinkage”).

More shrinkage generally goes with a tighter pattern — a cross-check on the loop width.

Q6 · Does the pattern look the same all over, or different in places?

Compare the crown (top), the edges/hairline, and the nape (back of the neck).

Many people have more than one pattern on one head — a description, never a problem.

Answer the questions above and we’ll show the range your answers point to.

What this does not mean

This tool describes one thing: the shape of the hair you can see. It cannot see, measure, or judge anything beneath your skin — so here is exactly what your result does not tell you.

  • the shape of your follicle beneath the skin
  • your donor density
  • any hair-loss diagnosis
  • whether you are a candidate for surgery
  • your transection rate
  • how difficult surgery would be
  • how successful extraction would be
  • the health of your hair
  • whether you have any disease or condition
  • your ethnicity

Most of all, it does not replace an in-person examination by a dermatologist or surgeon — that is where every real decision is made.

Why the visible pattern is worth knowing

A surgeon plans around the follicle — the living root below your skin. This tool can’t see that. What it can help you describe is the visible fibre: the curl or coil above the surface.

Those two are related. In tightly curled hair the follicle sits curved beneath the skin rather than straight, with a bent, golf-club-shaped bulb and an asymmetric root sheath. Because the fibre you can see grows from that follicle, its shape is a visible clue to a structure no one can see from the outside (source).

But a clue is not a measurement. The follicle beneath the skin may differ from what the surface suggests, and the only way to know is a hands-on assessment by someone qualified to give one. That gap — between the pattern you can see and the follicle you can’t — is the whole reason careful planning matters.

What this section deliberately does not say. It does not say a 4C pattern is “difficult”, that 4B means “more transection”, or that 4A gives “better results”. Those are claims about the follicle and the surgery — the very things this tool cannot see. It reports the relationship, not a verdict.

Continue learning

This tool is a starting point. Here is where each thread actually goes.

Hair typesWhy one person can carry more than one visible curl pattern across the scalp.Read →Curved folliclesWhat happens beneath the skin — and why the curve changes extraction.Read →CCCAA form of hair loss that often needs medical treatment before any transplant is considered.Read →Traction alopeciaWhen the curl pattern is not the problem: tension-related loss, assessed before surgery.Read →Donor areaThe region a transplant draws from — and why its capacity is measured in person.Read →FUEFollicular unit excision: how grafts are taken from the donor, one at a time.Read →

More: How this works & its limits · The 2-minute type test · Glossary · Research

The typing system is a vocabulary, not a measurement

The 3A–4C scale is a naming convention. There is no instrument behind it, no calibration, and no reference sample held anywhere against which a head can be checked. Two experienced people can place the same scalp one step apart and neither of them is making a mistake, because there is nothing for them to be mistaken against.

We use it anyway, and the reason is unglamorous: it is the language people already speak. Someone searching for help with their hair types the letter, not a fibre measurement. A site that refused the vocabulary on principle would be more precise and less useful. The methodology page sets out where the system came from, why it is subjective, and which alternatives are actually measurable — including approaches built on the geometry of the fibre rather than on how a curl looks to somebody.

Curl is built into the follicle, not into ancestry

The letter describes a strand you can see. What produces that strand sits under the skin, and it is not a matter of who you are. The curvature is built into the follicle itself — it persists in hair grown in culture, and it tracks with curl pattern rather than with ethnic origin.[1,2,3]

That finding carries more weight than its length suggests, because it moves the question off identity and onto anatomy. In tightly curled hair the follicle sits curved beneath the skin rather than straight, with a bent, golf-club-shaped bulb and an asymmetric root sheath.[1,2] A curved follicle is a geometric problem for a straight instrument, and geometry is the same regardless of whose head it is in. The curvature model shows what a straight punch meets when it enters a curved follicle.

This is also why we describe the hair rather than the person. “” on this site is a description of fibre shape, and it is used because the surgical literature uses it. It is not a claim about anybody’s ancestry, and a pattern letter is not a proxy for one.

Why a letter does not decide a surgical plan

It would be convenient if the type determined the technique — if 4C meant one punch and 3B meant another. The published work does not support that arrangement. In a retrospective series of 64 patients of African descent, the mean rate was 3-6%, and scalp thickness and firmness affected it more than hair curliness did.[4]

So a clinic that plans from your letter is planning from a variable that has been examined and found not to be the deciding one. The questions that do decide it are duller and more specific: what punch, at what diameter, and what transection rate has this clinic actually measured on hair like yours. A letter cannot answer any of them.

What the letter is good for is the conversation. It gives you and a surgeon the same words for the thing in front of you, which is worth having — as long as neither of you mistakes the word for the measurement.

Frequently asked questions

Is the 3A–4C scale scientific?

It is a naming convention rather than a measurement. It has no instrument, no calibration and no reference standard, so two careful people can place the same head one step apart without either being wrong. It is useful as shared language and should not be treated as data.

Does my curl pattern come from my ethnicity?

Curl is produced by the shape of the follicle, which is an anatomical feature rather than an ethnic one. Pattern varies widely within every population, and the fibre shape is what the surgical literature is describing when it uses the term Afro-textured.

Will my hair type tell a surgeon which technique to use?

No. Published work points to scalp characteristics rather than curl alone as what makes difficult. A plan built on a type letter is built on the wrong variable; ask instead about punch diameter and measured transection rate.

Does this assessment use a photograph or AI?

No. It asks about the hair you can see and touch, and it runs entirely in your browser. Nothing is uploaded, and no image is analysed.

What if I get a different answer on different days?

That is expected and it is not a fault in the test. Length, weathering, product and how recently hair was washed all change how a pattern reads, and most scalps carry more than one pattern anyway.

Clinical references

  1. Thibaut S, Gaillard O, Bouhanna P, Cannell DW, Bernard BA. Human hair shape is programmed from the bulb. Br J Dermatol. 2005;152(4):632-8. view source →
  2. Thibaut S, Barbarat P, Leroy F, Bernard BA. Human hair keratin network and curvature. Int J Dermatol. 2007;46 Suppl 1:7-10. view source →
  3. Kajiura Y, Watanabe S, Itou T, et al. Structural analysis of human hair single fibres by scanning microbeam SAXS. J Struct Biol. 2006;155(3):438-44. view source →
  4. Umar S, Khanna R, Lohlun B, Maldonado JC, Zollinger M, Osei-Tutu A, et al. Follicular Unit Excision in Patients of African Descent: A Skin-Responsive Technique. Dermatologic surgery : official publication for American Society for Dermatologic Surgery [et al.]. 2023;49(10):949-955. view source →

References are checked on the dates recorded in our evidence library. If a source has been superseded, tell us and we will update it.