Criteria for selecting patients for a hair transplant

A hair transplant is performed only when the candidate is deemed suitable for the procedure. Learn about the criteria and the red flags that determine whether someone is suitable or not for a hair follicle transplant

Patient Selection Criteria for Hair Transplant: Key Concepts

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1. Medical Red Flags

   A focused and detailed medical history will identify all the medical conditions that could complicate a hair transplant:

   • Coagulation disorders (history of pulmonary embolism, elevated aPTT, PT, Von Willebrand disease, etc.)

   • Healing disorders (keloid or hypertrophic scarring, delayed healing, impaired wound healing)

   • Cardiovascular disorders (arterial hypertension, previous myocardial infarction, arrhythmias, bypass surgery, artificial valves)

   • Liver disorders (hepatitis, cirrhosis)

   • Diabetes mellitus

   • Gastrointestinal disorders (ulcer, gastritis, esophagitis)

   • Neurological disorders (epilepsy, fainting episodes)

   • Orthopedic problems (cervical syndrome, intervertebral disc herniation)

   • Psychiatric disorders (depression, anxiety disorders, body dysmorphic disorder)

   • Lifestyle factors (alcohol consumption, smoking, substance use)

   • Any form of malignancy

   The above increase the likelihood of intraoperative complications (bleeding, cardiac events, hypoglycemia), while also jeopardizing smooth postoperative recovery (local or systemic infections, poor regrowth, severe edema, difficulty tolerating NSAIDs).

   Most of the above are not absolute contraindications for follicular unit transplantation; rather, it is important that the patient is informed in advance about the potential risks.

   Objective Red Flags

   There are cases where surgery is not advisable for obvious reasons:

   • Individuals of any age with extensive hair loss

   • Individuals with a very limited donor area (previous hair transplants, scarring, anatomical limitations)

   • Individuals with poor hair characteristics (very fine caliber, strong color contrast)

   • Individuals with low follicular unit density (<60 FU/cm²)

   • Individuals with low hair density within follicular units (average <1.5 hairs/FU)

   • Individuals with low scalp mobility, laxity, or elasticity

   • Individuals with diffuse thinning of the donor area (DUPA, DPA)

   • Young individuals with unknown family history of hair loss (e.g., adoption)

   • Individuals suffering from Hepatitis B, C, or HIV

   Patients with one or more of these characteristics are better advised not to undergo transplantation. The outcome will never be satisfactory, and since the procedure is lengthy and costly—“expensive and ultimately not worth it”—it is often preferable for the patient either to remain as they are or to consider alternatives such as hairpieces (wigs), medication, Scalp Micropigmentation, or other coverage methods.

   It is worth noting, however, that before rejecting a patient with any of these characteristics, their expectations should always be discussed. Experience has shown that even creating a small “tuft” in the central vertex area of an elderly stage VII patient may be enough to satisfy them—even if the physician does not share their enthusiasm! So we must remember that objective Red Flags are not set in stone

Further information on reasons why hair transplantation may not be possible

Elderly patients (>65 years old) who wish to undergo transplantation represent only about 5–10% of all patients with hair loss. It has been shown that as the decades pass, men become progressively less interested in their hair or their appearance in general.

The stage of hair loss must always be considered in conjunction with the patient’s age. Individuals between 18–30 years old who already present with stage >IV hair loss, or have a “burdened” paternal history, as well as those showing follicular miniaturization in the temporal–parietal junction, should be regarded as candidates for extensive hair loss in the future. For such patients, the genetic HairDX® test is extremely useful, providing up to 90% accuracy in predicting whether a patient with hair loss will experience extensive progression. Young patients whose donor area already shows significant miniaturization, or whose family history is strongly predisposed to hair loss, should be advised by their physician to wait until the progression of hair loss provides clearer signs of the stage they are headed toward.

If this conservative approach is not followed in a young patient with “active” hair loss, the result is often an unnatural appearance in the years to come, as hair loss progresses in the remaining scalp areas. By contrast, if the approach is conservative and the surgeon designs a long-term, strategic hairline, enough grafts can remain available to follow the natural progression of hair loss. This way, even if the expected progression does not occur, the conservative transplant can later be expanded in all directions. An aggressive approach, however, cannot be reversed; the patient may end up with a dense, perfect hairline but with too few grafts left in the donor area to cover new bald areas behind it.

The most difficult decision for the physician is to predict which patients are not candidates for transplantation before this becomes clinically evident. In younger patients at stage II–III or with minimal miniaturization (<20%) in other scalp areas, prediction is nearly impossible.

Beyond the standardized Norwood stages II–VII, Norwood also defined two additional types: Diffuse Patterned Alopecia (DPA) and Diffuse Unpatterned Alopecia (DUPA). While once considered rare, these are now recognized as relatively common and particularly challenging in modern hair transplantation.

• DPA refers to cases where follicular miniaturization is diffuse across the frontal, central, and posterior regions, while the hairline resembles stage II or III, and the donor area remains stable. Especially in early stages, thinning reaches the crown without major follicular loss. The key difference between DPA and the classic Norwood-Hamilton stages is that hair loss appears from the beginning as a “dense” stage VI without having passed through III, III-vertex, IV, or V.

• DUPA, on the other hand, differs from DPA in that there is no stable permanent donor zone. It is ten times more common in women and may be the main reason why women are not ideal candidates for hair transplantation. Moreover, DUPA often has non-androgenetic causes, such as anemia, thyroid disorders, collagen diseases, or severe psychological conditions. Generally, patients with either DPA or DUPA are not candidates for hair transplantation, and while this may be “hard” for the patient to hear, it is better that they are fully informed.

It is now possible to transplant follicles from other body areas using the BHT FUE method. Although this theoretically increases the pool of available grafts, BHT FUE is still not fully refined and is performed by only a few surgeons. Additionally, hair from other body areas differs from scalp hair: grafts are mainly single-hair units, thinner, and less lustrous. Still, with further technical progress and experience in body hair transplantation, it may soon be possible that no patient is denied a transplant—provided, of course, they can afford the cost.

The cost of hair transplantation is a factor every candidate must consider carefully. Particularly for younger patients, the earlier hair loss appears, the more extensive it will likely become. Follicular unit transplantation is often a long-term process requiring both patient and surgeon to “chase” the progression of baldness. The financial burden of this pursuit can be overwhelming. While the first surgery may be affordable, the second or third may not be. Life events such as unemployment, expensive health issues, disasters, or financial losses may prevent a patient from completing their restoration journey. Additionally, starting a family brings continuous financial obligations, often making it difficult to justify an “investment” in an aesthetic surgery like hair transplantation. It is not uncommon for a man to wish for a second or third surgery to improve on the results of the first, but for family finances to prevent it. Such situations can even lead to serious family conflicts, as the partner may see the surgery as wasteful, while for the man it remains a personal priority.

Finally, patients suffering from Hepatitis B, Hepatitis C, or HIV should be discouraged from undergoing hair transplantation. The risk for the surgical team is disproportionately high given that hair transplantation is an elective procedure, while the patient themselves should not undergo the trauma of thousands of micro-incisions.

Subjective Red Flags

Unfortunately, the field of hair transplantation—like almost every area of aesthetic surgery—attracts many individuals with psychological issues and unrealistic expectations of what hair transplantation can offer them. Patient dissatisfaction almost always stems from poor patient selection and a failure of physician–patient communication (on the physician’s part), rather than from purely medical or technical mistakes. A hair transplant surgeon must be able to identify individuals with significant psychological burdens and unrealistic expectations in order to avoid future disappointments and complications. These patients often share common traits and behaviors, which the physician must recognize in order to decide wisely whether or not to proceed.

Indicative signs of unrealistic expectations:

• Obsession with an excessively low hairline and very high density

• Obsession with exact graft numbers and precise density

• Demand for full coverage, including the crown

• Statements such as: “I don’t want the scalp to show at all”

• Bringing photos of actors or models and wanting to look like them

• Presenting with a fully detailed surgical plan, complete with diagrams, essentially “instructing” the surgeon how to perform the transplant

• Wanting an “invisible scar” while also wishing to continue shaving their hair extremely short after the procedure

• Patients with minimal thinning not noticeable upon basic clinical examination, yet exaggerating their desire for coverage

• Indecisive or ruminating individuals who repeatedly ask the same questions during calls, visits, or emails

• Belief that hair transplantation will fundamentally change their personal or social life

• Negative comments on before/after photos that most patients find satisfactory

• History of multiple cosmetic surgeries without satisfactory outcomes, now searching for the “savior surgeon”

These patients must be thoroughly informed about the limitations of hair transplantation and what they can realistically expect from such a procedure. However, in most of these cases, an underlying psychiatric disorder is also present—most commonly body dysmorphic disorder (BDD) or another obsessive–compulsive condition

Body Dysmorphic Disorder (BDD)

BDD is a psychiatric disorder characterized by excessive distress about one’s physical appearance, leading to specific dysfunctional behaviors. It is considered a subtype of obsessive–compulsive disorder. People with BDD believe that certain aspects of their appearance are unacceptable to others and, ultimately, to themselves. Interestingly, in most cases there is no real aesthetic problem, and often those affected are quite attractive. Statistically, at least 5–10% of individuals consulting a hair transplant surgeon suffer from BDD. Such patients will never be satisfied with the outcome of a hair transplant, no matter how perfect it is. They cannot comprehend the limits of what is achievable, and whatever result they obtain, they will always find a significant flaw. These patients often demand a second and third session before the results of the first transplant have even matured. If the surgeon gives in to their unreasonable demands, subsequent procedures will almost certainly worsen their psychological state rather than improve it, regardless of the clinical outcome.

For a hair transplant surgeon, it is a significant challenge to recognize whether a patient suffers from BDD. However, diagnostic questionnaires and algorithms are now available to help identify such individuals, allowing the physician to be particularly clear, cautious, and explanatory with them.

Typical symptoms/signs of BDD patients include:

• Reporting intense anxiety when comparing their appearance with others

• Frequently checking their appearance in mirrors or reflective surfaces—or, conversely, systematically avoiding them

• Trying to cover the “problem area” with hats, hands, posture, or other means

• Persistently requesting surgery to “fix” the area, even when the physician sees no surgical indication

• Expressing anger toward those who disagree that a problem exists

• Constantly “measuring” the perceived defect in various ways

• Repeatedly reading or searching online for information about their “problem”

• Avoiding social interactions or activities where the “problem area” might be visible

• Avoiding work because of distress over their appearance

The physician should always obtain a detailed psychiatric history from patients suspected of having BDD, discreetly inquire about avoidance behaviors related to their appearance, and investigate their motivations and psychosocial expectations from hair transplantation. It is also important to ask about prior cosmetic procedures, the level of satisfaction, and whether their concerns are objectively justified. Even wiser is to request a psychiatric evaluation before proceeding with hair transplantation.

Unfortunately, patients aged 18–35 make up around 30% of all hair transplant candidates. Thus, even the most conservative surgeon cannot automatically reject all individuals in this age group. In general, however, the physician must be prepared to turn down at least 10–15% of patients for hair transplantation due to the reasons described above.

Summary: Patient selection criteria for hair transplantation

Patient selection is perhaps the most important decision in follicular unit transplantation. It is equally important for the physician to remember that aesthetic “disasters” in hair transplantation are not caused only by poor technique but more often by improper patient selection and inadequate planning.

The most difficult decision for the physician is predicting which patients are not candidates for hair transplantation before this becomes clinically evident. Conversely, the easiest decision should be to politely but firmly reject those patients who are clearly unsuitable for surgery.

For all other patients—ranging from borderline to ideal candidates—the goal should be to reach a balance between the patient’s desires (or even fantasies) and the achievable outcomes.

Finally, in every case, the physician must keep in mind that performing surgery on a patient with a psychiatric disorder will “cost” the physician emotionally—and in terms of reputation—far more than the fee they will receive.

By Dr. Konstantinos Anastassakis

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