Direct DHI Hair Transplant: Choi Implanter Pen, Full Guide & Cost (2026)

Medical disclaimer. This article is educational and not medical advice. Hair restoration outcomes are individual; only a qualified surgeon can assess your case in a personal consultation.

Quick answer

Direct DHI (Direct Hair Implantation) is a hair transplant method that uses the Choi implanter pen — a hollow needle device — to place each follicular unit directly into the scalp at a chosen angle and depth, in a single step. It does not use pre-opened channels. Compared with Standard FUE and Sapphire FUE, DHI offers tighter angle control on each graft, particularly for hairline detail, beard transplants, eyebrow restoration, and women’s diffuse cases where shaving the recipient area is undesirable.

• From £2,250 (2026) at JCI-accredited Liv Hospital Ulus, Istanbul; £12,000–£20,000 (2026) at UK private clinics for 2,000 grafts.
• Best for: beard, eyebrow, female pattern thinning, refined hairline angle, unshaven-recipient cases.
• Recovery: 5–7 days back to office work; final density visible at month 12.

Table of contents

1. What Direct DHI actually is
2. How the Choi pen works
3. Hairline angle and native direction
4. How the procedure works, step by step
5. Who is it for
6. DHI vs Standard FUE vs Sapphire FUE
7. Cost in 2026
8. Recovery and 12-month timeline
9. Risks and trade-offs
10. How BergemHealth approaches this
11. What to do next
12. Frequently asked questions

What Direct DHI actually is

Definition — Direct DHI. A hair transplant method in which each follicular unit is loaded into a Choi implanter pen — a hollow stainless-steel or sapphire-tipped needle — and pressed directly into the recipient site. Channel-opening and implantation happen as a single combined step, eliminating the separate channel-opening phase used in FUE.

DHI was developed in South Korea in the early 1990s and standardised by the Choi family of implanter pens originating from Kyungpook National University; the Choi pen has been in clinical use since 1992.¹ It is now one of three mainstream implantation approaches recognised internationally, alongside steel-blade and sapphire-blade FUE workflows.²

The harvest step is identical to FUE — individual follicular units are removed from the donor area with a 0.7–1.0 mm circular punch.³ The difference is what happens next. In FUE, recipient channels are opened first (with steel or sapphire blades) and grafts are placed by hand into those pre-opened channels. In DHI, the graft is loaded into the Choi pen at the moment of placement, and the pen does both jobs at once: it cuts the channel and deposits the follicle in one motion, at a controlled angle and depth. Use of single-step implanter devices has grown across the field in recent ISHRS practice census data.²

How the Choi pen works

A Choi implanter pen is a hollow needle, typically 0.6–1.0 mm in diameter, mounted in a finger-trigger handle.¹ The technician loads a follicular unit into the back of the needle so that it sits inside the lumen with the bulb (the growing root) flush at the tip. The surgeon (or trained DHI technician) then presses the tip into the scalp at the chosen angle, presses the trigger, and the follicle is pushed into the dermis as the needle withdraws.

The Choi pen can reduce the separation between channel creation and graft placement; this can help with angle control but also makes the procedure slower and more operator-dependent than steel-blade FUE.

The advantages of this combined step:

• Angle control to a fine tolerance. The pen tip is angled before insertion; once inserted, the graft is delivered along that angle. This matters most where every hair is visible — the leading hairline edge, the eyebrow, the beard.
• The graft is out of holding solution for a shorter time. A graft loaded into the Choi pen is implanted within seconds. In FUE, grafts wait in chilled holding solution while channels are opened, then are picked up with forceps. The total out-of-body time is broadly comparable in well-run clinics, but in our clinical experience the Choi-pen workflow shortens the handling step.²
• Recipient shaving is often unnecessary. Because no separate channel-opening phase is required, the pen can be inserted between existing hairs without needing to shave them. In our practice this is the main reason we default to DHI for female diffuse thinning.

The disadvantages:

• Slower per graft. A trained team typically places 600–1,000 grafts per hour with DHI versus 1,200–1,800 per hour with FUE. In our practice at Liv Hospital Ulus, a 2,500-graft DHI day runs 9–10 hours; the same FUE day runs 7–8.
• More technician training required. Loading and operating the Choi pen well takes 18–24 months of supervised practice. In a clinic where only the surgeon can do it well, throughput is low.
• Higher consumable cost. Choi pen tips are single-use per case; a 2,500-graft session uses 6–10 pens.

Hairline angle and native direction

The hairline is not a straight line. It curves, has irregular soft edges, and the hairs that emerge from it follow a native angle that is rarely a uniform 30–40°. Most patients have at least one cowlick where the angle reverses; many have a frontal whorl or crown swirl that propagates micro-direction changes into the temporal points; and the leading hairline edge typically exits the scalp at a flatter angle (10–25°) than the hair sitting one centimetre behind it. The Choi pen gives the surgeon physical access to the angle decision at the moment the graft enters the scalp, rather than committing to a channel angle minutes earlier and then trying to match it during placement. In our practice this is where DHI earns its premium — particularly in patients with cowlicks, whorls or asymmetric hairlines where every graft has to follow native angle.²

How the procedure works, step by step

In our practice at Liv Hospital Ulus, a 2,500-graft Direct DHI day runs nine to eleven hours.

1. Consultation and design (30 min). Hairline drawn in front of mirror with patient awake. For women, the recipient area is examined under magnification with existing hair in place.
2. Donor preparation and anaesthesia (45 min). Donor area shaved to 1 mm. Recipient area is not shaved in most cases. Local anaesthesia is administered in line with standard hair-restoration protocols.⁴
3. Extraction (3–4 hours). Standard 0.7–0.9 mm micropunch — same as FUE. Grafts sorted under microscopes and held in chilled storage solution.
4. Lunch break (45 min).
5. Loading and implantation (4–5 hours). Each graft is loaded into a Choi pen (typically 4–6 pens cycled by the technicians). The surgeon places the first 200–400 grafts of the hairline personally; trained DHI technicians handle the bulk under direct supervision, with the surgeon directing angle and density throughout.
6. Discharge briefing. Wash schedule, swelling expectations, week-1 review and aftercare contact.

The DHI implantation phase is structurally different from FUE. Where FUE has a “channel-opening” step the surgeon does largely alone (1.5–2 hours of intense, artistic work), DHI integrates that work into the implantation phase. The surgeon’s hands-on role in DHI is concentrated on the first 1.5 cm of the hairline and on supervision throughout, rather than on a discrete blade phase.

Who is it for

Direct DHI is the right method when:

• Beard or eyebrow transplant. Angle control on every implanted hair is critical at this distance — DHI is the standard of care for facial hair restoration.
• Female pattern hair loss (Ludwig I–III). Recipient area can usually be left unshaven; the pen places grafts between existing hairs. In our practice, DHI is our default for female diffuse cases.
• Refined hairline angle in male cases. Particularly when the patient has an unusual hair-growth direction (cowlicks, crown swirl, frontal whorl) where every graft has to follow native angle.
• Patients who cannot have visible shaving for social or professional reasons (and prefer to avoid the cost premium of long-hair FUE).

Direct DHI is not the optimal choice for:

• Very large male sessions of 4,000+ grafts. Throughput is too slow and the unit cost too high; Sapphire FUE is structurally better suited.
• Patients prioritising lowest cost — DHI is the most expensive of the three methods.
• Crown-only restorations where pure volume matters more than angle precision.
• Patients with marginal donor density, where the priority is maximising graft survival rather than refining placement angle.⁴
• Norwood VI–VII cases requiring repeated sessions, where total yield is donor-limited.

DHI vs Standard FUE vs Sapphire FUE

Note: Sapphire FUE typically achieves the highest per-session density of the three methods because the narrow sapphire blade allows tighter channel spacing. DHI prioritises angle precision and unshaven access, not raw per-cm² density.

Full side-by-side: FUE vs DHI vs Sapphire FUE.

Cost in 2026

DHI is the most expensive of the three modern methods, primarily because of slower throughput (more surgeon and technician hours per graft) and higher consumable cost.

A note on graft-mill DHI pricing: the cheapest end of the Istanbul market sometimes quotes “DHI” prices that are not much higher than FUE. This usually reflects either (a) the use of a Choi pen for only the first 100–200 grafts of the hairline while the rest is placed by FUE, or (b) heavy reliance on technicians without surgeon supervision. Both produce results that are not what a properly conducted DHI procedure delivers. Read the graft-mill red flags article for what to ask before booking.

The full UK vs Turkey breakdown is in the hair transplant cost in 2026 article.

Recovery and 12-month timeline

The recovery profile is broadly the same as Sapphire FUE — the difference is mostly in social visibility during week 1 (DHI patients with unshaven recipient areas can return to work earlier with less obvious evidence of surgery). Read the 12-month timeline.

Risks and trade-offs

The DHI risk profile is the same overall as FUE — DHI is the same harvest, different placement. The Choi pen does not introduce new categories of risk; it shifts where the operator-skill bottleneck lives.

• Folliculitis in 10–20% of patients, typically weeks 4–8 post-op; usually self-limiting and managed with antibacterial wash.⁵
• Temporary numbness in donor or recipient — resolves over 3–6 months.
• Shock loss of native hair — particularly relevant in DHI female cases where surrounding native hair is dense. Almost always grows back by month 6.⁴
• Graft survival 90–95% (2026) in well-run clinics.³ In our experience, DHI outcomes are more sensitive to operator skill than steel-blade FUE because each graft is handled inside the Choi pen.
• Slower throughput, longer day — relevant for patient comfort, not safety.
• Donor-density and facility limits. Safe extraction is bounded by safe-zone density (typically 65–85 FU/cm² occipital); infection risk depends on facility standards and aftercare.⁴⁶

The DHI-specific trade-off is cost (£500–£1,000 more than Sapphire FUE per session in 2026) and session limits (practical ceiling around 3,500 grafts in a single day). For the cases DHI is optimal for — beard, eyebrow, female, refined hairline — the cost is justified. For a 4,500-graft Norwood V case, FUE almost always makes more sense.

How BergemHealth approaches this

DHI is the BergemHealth default for:

• All beard and eyebrow restorations.
• All female pattern hair loss cases (Ludwig I–III).
• Male hairline cases in patients with unusual growth direction or who cannot have visible shaving.

Surgical leadership. All cases are led by Dr. Hamid Aydın (ISHRS member, former SAÇDER president, 25,000+ procedures since 2000). Dr. Aydın personally draws the hairline in front of a mirror with the patient awake, and personally places the first 200–400 grafts at the leading edge of the hairline before handing the remaining placements to the technician team under his direct supervision.

Technician team. Our DHI technicians have an average tenure of eight years on the same team, with a structured training pipeline that takes a new technician 18–24 months from observation to independent Choi-pen placement under supervision. Continuity matters more in DHI than in FUE because the loading and trigger-pressure technique is what determines graft survival inside the pen; we do not rotate freelance technicians in and out.

Caseload limit. A maximum of two DHI patients per day per surgical team. The DHI throughput limit makes parallel cases impractical for serious work, and we will not compromise on supervision time per patient. Many graft-mill clinics in Istanbul run 4–8 patients per surgeon per day; we do not.

Sterility and consumables. Single-use Choi pen tips. No reuse, no sharpening between cases. JCI-accredited Liv Hospital Ulus operating environment for the procedure itself.

UK aftercare pathway. For UK patients, post-op review at week 1 (in Istanbul or remotely), and in-person follow-ups at month 6 and month 12 at Harley Street Hospital in London with Dr. Sumeyye Yuksel (GMC-registered, CQC-regulated facility). Touch-up assessment at month 12 is included; a touch-up procedure, if clinically indicated, is performed at no additional surgical fee.

What to do next

If you are comparing methods, costs or countries, the safest next step is not to choose a package — it is a personal assessment of your donor area, hair-loss pattern, age, health history and goals.

• Free assessment. Send five photos; we will return a graft estimate, method recommendation (Standard FUE / Sapphire FUE / DHI) and an itemised quote within two working days. → Book a free consultation
• Compare: Standard FUE · Sapphire FUE · Method comparison
• Pillar: Hair transplant: methods, results, cost

JCI-accredited Liv Hospital Ulus, CQC-regulated Harley Street Hospital, ISHRS member surgeon. Quote in writing, line by line.

Frequently asked questions

Sources

Additional reading:

• ISHRS. Membership and Fellow Designation Criteria.
• Joint Commission International. About JCI Accreditation.
• NHS. “Hair loss.”

Reviewed by BergemHealth member and former SAÇDER (Turkish Society of Hair Restoration Surgeons) president, lead surgeon for hair restoration at Liv Hospital Ulus, Istanbul. 25,000+ procedures since 2000. Last updated 4 May 2026.