Hair transplant glossary: understand the terms used at your consultation

What are you counting when you count hairs?

Hair follicle, bulb and shaft

A follicle is the living structure within the skin that produces a hair. Its deeper portion, the bulb, contains the cells that make the shaft, which forms the visible strand. This distinction helps explain why a shaft falling out after surgery does not necessarily mean that the transplanted follicle has been lost: it may subsequently produce another hair (Goldin et al., 2025).

Follicular unit and graft

A follicular unit is a natural grouping of neighbouring follicles, usually associated with one to four hairs. A graft is the small piece of tissue removed and transferred, containing the follicles that need to be preserved; modern transplantation generally works with these units. Graft counts and hair counts therefore measure different things. Ask which figure appears in your proposal and how single-hair and multiple-hair units will be allocated.

Donor area and donor supply

The donor area provides the grafts, often from the back and sides of the scalp within a region assessed for resistance to pattern hair loss. Donor supply means the amount that can be harvested while retaining acceptable coverage where the hair came from. Density, follicle quality and previous harvesting all affect that supply; simply having hair in a particular area does not establish its suitability (Garg & Garg, 2021).

Recipient area, hairline, temples and crown

The recipient area is the surface that will receive the grafts. The frontal hairline marks the edge of the hair above the forehead, while temple recession describes the retreats on either side of it. The crown, also called the vertex, lies towards the upper back of the head and commonly contains a whorl; its growth pattern needs to be considered when planning implantation (Marwah & Mysore, 2018).

Density, calibre and coverage

Density measures a quantity within an area, expressed as hairs or follicular units per square centimetre, so the unit of measurement should always be stated. Calibre refers to the thickness of an individual hair. Visible coverage also depends on curl, direction and the contrast between hair and skin; two people receiving the same number of grafts can therefore have different amounts of scalp showing afterwards.

Anagen, catagen, telogen and exogen

Anagen is the active growth period, followed by catagen, when the follicle regresses, and telogen, its resting period. Exogen describes the release of the old hair shaft. Follicles do not all pass through these stages together, allowing the hair to renew gradually rather than as a single batch (Goldin et al., 2025). Understanding the hair growth cycle also explains why regrowth is assessed over several months.

Which terms describe hair loss?

Diffuse and localised alopecia

Alopecia means reduced or absent hair in an area where it would normally grow. “Diffuse” describes loss spread across a wider area, while “localised” describes one or more defined patches. These words describe the distribution rather than establish the cause: the history of the shedding, examination of the scalp and sometimes further investigations are needed to reach a diagnosis (Syed & Zito, 2024).

Androgenetic alopecia, DHT and miniaturisation

Androgenetic alopecia involves an inherited susceptibility and a progressive change in affected hairs, which become finer and shorter through a process called miniaturisation. DHT, or dihydrotestosterone, is a hormone made from testosterone that contributes to this process in men. Its role in female pattern hair loss is less straightforward, and thinning alone does not establish that someone has a hormonal imbalance (Goldin et al., 2025).

Telogen effluvium

Telogen effluvium is increased shedding associated with an unusually large number of hairs entering the resting phase. It can begin several months after a trigger such as illness, childbirth, significant stress or a medication change. Identifying the cause guides management; the diagnosis does not automatically make a transplant appropriate, particularly when the underlying trigger can be addressed (Syed & Zito, 2024).

Alopecia areata

Alopecia areata is an immune-mediated condition that can produce bald patches and sometimes more extensive loss. Its mechanism differs from androgenetic alopecia, and its course can include relapses. A bare patch therefore needs assessment before cosmetic treatment is planned; NHS guidance explains that hair transplantation is not usually suitable for this type of hair loss.

Scarring alopecia

In scarring alopecia, follicles are destroyed and replaced by scar tissue. Some forms arise from inflammatory disease, while others follow a burn or injury. Active inflammatory scalp disease needs medical management before a transplant can be considered: surgery may fail or worsen the condition, and any later assessment of suitability remains individual (Syed & Zito, 2024; Goldin et al., 2025).

How do the techniques and instruments differ?

Harvesting, graft storage and implantation are separate stages of the operation. The hair transplant guide puts each step into the wider treatment process, helping you understand the procedure before comparing the names used in different proposals.

FUE and the punch

FUE stands for Follicular Unit Extraction, also described as Follicular Unit Excision in the literature. A punch, a small hollow circular instrument, frees individual units before they are removed. Its movement may be manual or motorised; both approaches involve surgical harvesting that creates small wounds and can leave dot-like scars in the donor area (Garg & Garg, 2021).

FUT, strip harvesting and closure

In everyday clinical use, FUT describes harvesting a strip of scalp, which is then divided into follicular units under magnification. The edges of the donor wound are brought together with stitches or staples, leaving a linear scar. This method still has indications for selected patients; the discussion includes healing and hairstyle preferences, explained further in our article on FUT hair transplantation.

DHI and the implanter pen

DHI stands for Direct Hair Implantation and commonly refers to placing grafts with an implanter, often a Choi-type device. A graft is loaded into the instrument before being deposited in the scalp; a sharp implanter combines making the opening with placing the graft. Harvesting may already have been performed using FUE, which explains why DHI and FUE describe different parts of the procedure (Marwah & Mysore, 2018).

Recipient sites and implantation angle

Recipient sites are the small openings that accommodate the grafts. They can be prepared before placement with forceps or created during insertion, depending on the instrument used. Their direction, depth and angle contribute to the appearance: the front needs to fit the planned hairline, while grafts at the crown need to follow the surrounding whorl (Marwah & Mysore, 2018).

Transection and graft storage

Transection means accidentally cutting through a follicle during harvesting or preparation. It may impair that follicle’s ability to produce hair, so the technique needs to account for its depth and curvature. Graft storage covers the interval before implantation, when protection from drying and handling injury matters alongside the time spent outside the body (Garg & Garg, 2021; Marwah & Mysore, 2018).

What does the clinician assess before surgery?

Trichoscopy and donor assessment

Trichoscopy uses a dermatoscope to examine magnified views of the hair and scalp. It can reveal differences in hair diameter, miniaturisation and certain signs of inflammation. Alongside clinical examination, it helps distinguish causes of loss and assess potential donor regions; a general photograph cannot provide all of this information (Syed & Zito, 2024).

The Norwood and Ludwig scales

The Hamilton-Norwood classification describes patterns and degrees of male pattern baldness. The Ludwig classification mainly describes central thinning associated with female pattern hair loss. These scales help communicate how loss is distributed, but a stage does not translate directly into a graft count: the area, available supply and intended coverage still need assessment (Goldin et al., 2025).

Treatment planning and overharvesting

A hair restoration plan allocates grafts to priority areas while allowing for possible changes in the hair that remains. Overharvesting removes too many units from the donor area and can leave lasting, sometimes patchy thinning. A high number quoted in a proposal therefore needs to be considered against the actual donor supply, any previous procedures and potential future needs (Kerure & Patwardhan, 2018).

Local anaesthesia and pre-anaesthesia

Local anaesthesia reduces pain sensation in the treated regions while you generally remain awake. Pre-anaesthesia is an earlier step intended to improve comfort; the term does not describe the entire anaesthetic protocol. At Body Expert, needle-free pre-anaesthesia accompanies the local anaesthesia used for the transplant, and the team needs to know your medical history and any previous reactions to medicines.

How are recovery and regrowth described?

Transplanted hair shedding and shock loss

The shafts carried by transplanted grafts can shed during the weeks after surgery before new growth appears. Shock loss more specifically describes shedding of existing hairs around the operated areas. It is often temporary, although severely miniaturised hairs may not recover; our article on shock loss after a hair transplant explains this distinction in more detail (Marwah & Mysore, 2018; Kerure & Patwardhan, 2018).

Crusting, oedema and folliculitis

Crusts form over the small wounds, while oedema means swelling caused by fluid collecting within the tissues. Folliculitis is inflammation around a follicle, which can appear as small spots; the clinical team needs to assess its cause. Severe pain or unexpected symptoms warrant prompt contact with the clinic, rather than judging their significance from a label alone (Kerure & Patwardhan, 2018; NHS, 2023).

Dot scars and a linear scar

FUE harvesting can leave small marks scattered across the donor area, whereas FUT strip harvesting produces a linear scar. Their visibility depends partly on healing, skin colour and hair length. Describing either procedure as “scar-free” is therefore misleading, even when the marks are difficult to see beneath the person’s usual hairstyle (Kerure & Patwardhan, 2018).

Regrowth and the developing result

Regrowth means new hairs becoming visible; assessing the overall result then requires time to judge the coverage achieved. NHS guidance places the usual start of visible growth around the fourth month and the full result between 10 and 18 months, with individual variation. Very early photographs mainly document healing, while later checks taken under comparable conditions help show how the appearance is changing.

Which additional treatments might be discussed?

Minoxidil and finasteride

Minoxidil and finasteride are medicines used for certain forms of androgenetic alopecia. They address hair loss, including loss affecting the hair around a transplanted area, and suitability depends on the diagnosis and the individual patient. The choice, possible adverse effects and timing around surgery should be discussed with the prescriber; knowing what a medicine is does not establish that it is right for you (Syed & Zito, 2024).

PRP and photobiomodulation

PRP stands for platelet-rich plasma, while LLLT refers to low-level light or laser therapy, also described as photobiomodulation. These are among the additional approaches studied for androgenetic alopecia; neither term means harvesting follicles or implanting them (Syed & Zito, 2024). Ask what indication applies to you and what benefit is being proposed, rather than assuming that mentioning a treatment makes it part of the transplant package.

How can you use these terms at your consultation?

A clear proposal sets out the diagnosis, intended treatment areas, estimated graft count and planned harvesting and implantation methods. It should also explain the limits of coverage, risks relevant to your scalp and who to contact after returning home. These details help you compare treatment plans that sometimes use different names for similar steps.

For a hair transplant in Istanbul, our team can explain the terminology in your proposal and provide a free quote within 24 hours, without obligation. Body Expert’s support includes a dedicated English-speaking patient coordinator and remote post-operative follow-up for 12 months. The consultation brings those terms back to your examination, preferences and the practical possibilities of surgery.

Sources

Syed, H. A., & Zito, P. M. (2024, February 26). Alopecia. In StatPearls. StatPearls Publishing. NCBI Bookshelf.

Goldin, J., Zito, P. M., & Raggio, B. S. (2025, August 2). Hair transplantation. In StatPearls. StatPearls Publishing. NCBI Bookshelf.

Garg, A., & Garg, S. (2021). Overview of follicular extraction. Indian Journal of Plastic Surgery, 54(4), 456–462. https://doi.org/10.1055/s-0041-1739244.

Marwah, M. K., & Mysore, V. (2018). Recipient area. Journal of Cutaneous and Aesthetic Surgery, 11(4), 202–210. https://doi.org/10.4103/JCAS.JCAS_124_18.

Kerure, A. S., & Patwardhan, N. (2018). Complications in hair transplantation. Journal of Cutaneous and Aesthetic Surgery, 11(4), 182–189. https://doi.org/10.4103/JCAS.JCAS_125_18.

NHS. (2023, September 29). Hair transplant. NHS.