Hair Analysis and Trichology: What Does Accurate Diagnosis Involve? 2026

What Is Trichology? The Scope of Hair Science

Trichology — derived from the Greek "trichos" (hair) and "logos" (science) — is the specialised medical discipline studying hair shaft biology, scalp health, and hair loss disorders. Originally an offshoot of dermatology, trichology has evolved into an independent field of expertise. Trichologists use both clinical examination and advanced diagnostic technology to identify the underlying cause of hair loss and then design evidence-based, individualised treatment protocols.

A significant proportion of patients presenting with hair loss never receive a correct diagnosis and spend years on ineffective treatments or temporary remedies. Yet androgenetic alopecia, telogen effluvium, alopecia areata, and scarring alopecias each require fundamentally different management strategies. Trichological evaluation provides the scientific basis that makes this distinction possible.

The Biology of the Hair Cycle: Why Is It So Complex?

The hair shaft is one of the fastest-growing structures in the body, and that rapid growth demands a high metabolic turnover. Every hair follicle cycles through three principal phases:

• Anagen (growth phase): Under normal conditions, 85–90% of follicles are in this phase. It can last 2–7 years, a duration that is genetically determined. Average daily growth is 0.3–0.4 mm.
• Catagen (transition phase): A brief transitional period of 2–3 weeks; only 1–2% of follicles are in this phase at any time. The follicle begins to detach from the dermal papilla.
• Telogen (resting phase): Lasts 2–3 months; 10–15% of follicles reside here. At the end of this phase the hair sheds and a new anagen cycle begins.

Losing 50–100 hairs daily is within physiological limits. Shedding beyond this range signals the presence of a factor disrupting the follicular cycle — and identifying that factor is the primary goal of trichological assessment.

Trichoscopy: Dermoscopy of the Scalp

Trichoscopy is a diagnostic method that uses a dermoscope or digital videodermoscope to examine hair shafts and follicles at 20–100× magnification. Systematised by Professor Lidia Rudnicka in 2004, trichoscopy has become the gold standard for diagnosing many types of alopecia.

Trichoscopy Finding	Indicated Diagnosis	Clinical Significance
Yellow dots	Alopecia areata	Dystrophic anagen finding; follicle empty and degranulated
Reduced perifollicular pigmentation	Androgenetic alopecia	Sign of follicular miniaturisation
Vellus (non-medullated) hairs	Androgenetic alopecia (advanced)	Terminal-to-vellus ratio <4:1 is pathological
Perifollicular scales / crusting	Seborrhoeic dermatitis, psoriasis	Indicates active inflammatory process
Fibrotic white dots	Scarring alopecia (LPP, CCCA)	Permanent follicle loss; early treatment is critical
Black dots, broken hairs	Trichotillomania, tinea capitis	Mechanical or infectious origin

The Pull Test: Simple Yet Invaluable

The pull test is the simplest and fastest component of a trichological examination; however, it can yield misleading results if not performed with correct technique. The procedure is as follows: 40–60 hairs are grasped between two or three fingers close to the scalp and pulled with a slow, consistent force. Under normal circumstances fewer than 3–4 hairs should be extracted; 6 or more hairs constitutes a pathological result.

The pull test is particularly positive in active telogen effluvium and also helps detect the active phase of androgenetic alopecia. At the peripheral margin of alopecia areata, the characteristic finding of "exclamation-mark" hairs being easily extracted is diagnostic. The test should be performed in at least three different zones (frontal, temporal, occipital), and the patient must not have washed their hair in the preceding 48 hours.

Phototrichogram and TrichoScan: Quantitative Measurement

The phototrichogram involves photographing a defined scalp area (typically 1 cm²) at an interval of 2–3 days, enabling objective determination of the anagen/telogen ratio and hair growth rate. TrichoScan advances this process into software-assisted automated analysis.

Regarded as the gold standard in clinical research, this method is a critical tool for objectively measuring treatment efficacy. For example, an increase in the anagen ratio following three months of PRP therapy can be documented with TrichoScan to objectively confirm treatment response. At Virtuana Clinic, pre- and post-treatment TrichoScan assessment is used to record each patient's response.

Digital Hair Analysis: Which Parameters Are Measured?

Digital hair analysis systems used in contemporary trichology practice objectively measure the following parameters:

• Hair density: Total number of hair shafts per unit area (cm²). Normal range: 180–300/cm²; clinical thinning begins when values fall below this range.
• Shaft diameter: Mean diameter and standard deviation. Vellus miniaturisation in androgenetic alopecia is tracked objectively with this measurement.
• Terminal-to-vellus ratio: >4:1 normal; <2:1 indicates advanced androgenetic alopecia.
• Anagen/telogen ratio: Normal: 85–90% anagen. A decline in this ratio signals active hair loss.
• Follicular unit analysis: Distribution of single, double, and triple follicular units.

Hormonal Assessment: Which Tests Are Ordered?

Evaluating hormonal factors in hair loss is an indispensable part of the diagnostic process, especially in female patients. Laboratory tests routinely ordered at Virtuana Clinic — with additional tests added in specific clinical situations — are listed below:

Test	Relationship to Hair Loss	Target Value
Serum ferritin	Low iron stores = telogen shift	>70 ng/mL (for hair health)
TSH, fT3, fT4	Both hyper- and hypothyroidism cause hair loss	TSH: 0.4–4.0 mIU/L
Testosterone, DHEAS, androgens	Hormonal driver of follicular miniaturisation	Reference ranges by age and sex
25-OH Vitamin D	Vitamin D receptors are expressed in follicles; deficiency contributes to alopecia	>40 ng/mL
Zinc	Required for keratin synthesis; deficiency causes diffuse shedding	70–120 µg/dL
Prolactin	Hyperprolactinaemia disrupts hormonal balance	<20 ng/mL (women)
ANA, Anti-dsDNA	Differential diagnosis of lupus and autoimmune alopecia	Negative

Scalp Biopsy: When Is It Necessary?

Scalp biopsy is an invasive procedure reserved for cases in which clinical and trichoscopic assessment is insufficient to reach a diagnosis. A 4 mm punch biopsy specimen is examined in horizontal sections to evaluate follicular density, presence of fibrosis, and inflammatory cell infiltration.

Biopsy is most commonly indicated in the following situations:

• Suspected scarring (fibrotic) alopecia — conditions such as lichen planopilaris (LPP), frontal fibrosing alopecia, and discoid lupus require prompt diagnosis and treatment without delay
• Alopecia areata versus androgenetic alopecia that cannot be differentiated by trichoscopy
• Diffuse alopecia cases that fail to respond to treatment
• Situations where clinical presentation and laboratory findings are discordant

At Virtuana Clinic, cases requiring biopsy are managed in close coordination with the pathology laboratory.

Major Types of Hair Loss and Their Trichological Features

Type	Distribution Pattern	Pull Test	Trichoscopy	Reversibility
Androgenetic alopecia	Frontal/vertex, symmetrical	Positive (active phase)	Miniaturisation, increased vellus	Partial (with early treatment)
Telogen effluvium	Diffuse, entire scalp	Markedly positive	Increased telogen hairs, normal follicles	Complete (once cause is removed)
Alopecia areata	Round patches, asymmetric	Positive at periphery	Yellow dots, broken hairs	Usually (with treatment)
Scarring alopecia	Focal or diffuse	Variable	White dots, fibrosis	No (can be halted with early treatment)
Traction alopecia	Frontal hairline, temporal	Weakly positive	Periostial casts at follicular openings	Yes (in early stages)

Hair Loss in Women: Situations Requiring Special Evaluation

Hair loss in women has a considerably more complex aetiology than in men. Polycystic ovary syndrome (PCOS), postpartum telogen effluvium, peri-menopausal oestrogen decline, and iron-deficiency anaemia are the most frequently encountered triggers of hair loss in female patients. For this reason, trichological assessment for women at Virtuana Clinic mandatorily includes a hormonal panel and complete blood count.

The Ludwig classification divides female-pattern androgenetic alopecia into three stages; the Sinclair scale offers a more nuanced grading approach. In early stages (Ludwig I), PRP monotherapy can maintain and increase hair density, while more advanced stages (Ludwig II–III) respond better to combination protocols.

Hair Loss in Men: The Norwood–Hamilton Classification

Male-pattern androgenetic alopecia is graded from I to VII on the Norwood–Hamilton scale. In trichological assessment, this classification guides both prognosis and treatment planning. Medical treatments (PRP, minoxidil, finasteride) yield strong responses at Norwood stages I–III, whereas follicular transplantation may be considered from Norwood V–VII.

While the role of the 5-alpha reductase enzyme in dihydrotestosterone (DHT) production constitutes the core genetic mechanism in men, trichological evaluation must bear in mind that DHT level alone is not the sole determinant and that follicular sensitivity varies significantly between individuals.

The Trichology Protocol at Virtuana Clinic: Step by Step

Trichological assessment at Virtuana Clinic in Izmit goes beyond a single consultation and analysis:

1. Comprehensive medical history: Onset and progression of hair loss, family history, medications, dietary habits, stress factors over the past six months, and hormonal changes (pregnancy, menopause) are explored.
2. Trichoscopy: At least four scalp zones (frontal, vertex, temporal, occipital) are examined with a dermoscope; findings are photographed and documented.
3. Pull test: Applied in three different zones following a standardised protocol.
4. Laboratory assessment: A panel including ferritin, TSH, androgens, vitamin D, zinc, and full blood count is ordered.
5. Digital hair analysis: Hair density, shaft diameter, and anagen/telogen ratio are measured using TrichoScan-compatible software, establishing a baseline for comparative evaluation at subsequent visits.
6. Personalised treatment plan: All findings are integrated to create an individualised protocol comprising PRP, mesotherapy, PDRN, exosomes, or a combination thereof — supplemented with systemic therapy where necessary.

How Often Should Hair Analysis Be Performed?

During active treatment, trichological evaluation every three months is recommended to monitor progress and dynamically update the protocol. If treatment response meets expectations, the patient transitions to a maintenance interval, and an annual assessment becomes sufficient. If response weakens, the protocol is intensified or additional modalities are introduced.

Hair loss is a gradually progressive process if left untreated. Trichological evaluation started early and sustained with regular follow-up substantially increases both the efficacy and safety of treatment.

When Is Trichological Evaluation Essential?

• If more than 100 hairs are shed daily and this has continued for more than two weeks
• If noticeable thinning is perceived or scalp visibility is increasing in mirrors or photographs
• If the scalp is itchy, burning, red, or flaking
• If round patches or asymmetric areas of hair loss are developing
• If there is a family history of early-onset hair loss
• If hair loss began following a hormonal change (pregnancy, thyroid condition, menopause)
• If a hair transplant is being considered — pre-operative trichological evaluation is mandatory

This article is for informational purposes only. Please consult a qualified physician for treatment decisions.