# Situation: A nurse runs an adolescent-friendly health service at a Rural Health Unit (RHU) for clients aged 10 to 19 years who come for check-ups, school requirements, and counseling. A 12-year-old boy asks what changes to expect during puberty and in what order. Which sequence of pubertal changes in boys is usual?

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=629536  
> language: ko  
> subject: Nursing Practice II — Maternal and Child Health Nursing

## 문제

Situation: A nurse runs an adolescent-friendly health service at a Rural Health Unit (RHU) for clients aged 10 to 19 years who come for check-ups, school requirements, and counseling.

A 12-year-old boy asks what changes to expect during puberty and in what order. Which sequence of pubertal changes in boys is usual?

## 보기

1. Pubic hair, testicular enlargement, penile growth, peak height velocity
2. Testicular enlargement, pubic hair, peak height velocity, penile growth
3. Testicular enlargement, peak height velocity, pubic hair, penile growth
4. Testicular enlargement, pubic hair, penile growth, peak height velocity **✔ 정답**

**정답: 4**

## 해설

In boys, puberty begins with testicular enlargement, usually between 9 and 14 years. Pubic hair follows, then the penis lengthens and later widens, and the peak height velocity, voice deepening, and facial hair come later. Boys reach their growth spurt about 2 years after girls, late in the pubertal sequence.

## 심화 해설

Understanding the usual sequence of male puberty

The question asks for the typical order of pubertal changes in a 12-year-old boy. In adolescent health nursing, knowing this sequence is essential for assessing normal development, reassuring clients, and identifying deviations that warrant further evaluation.

In boys, the first observable sign of puberty is testicular enlargement, not pubic hair or penile growth. This reflects activation of the hypothalamic-pituitary-gonadal (HPG) axis, which stimulates the testes to produce testosterone and begin spermatogenesis. Testicular volume increases above 4 mL or a length above 2.5 cm, typically between 9 and 14 years of age [1].

After testicular enlargement, pubic hair appears as a result of adrenal androgens and rising testosterone. This is followed by penile growth, first in length and later in width. The peak height velocity, or growth spurt, occurs late in the pubertal sequence, after the genital changes are well underway. Voice deepening and facial hair appear even later [1].

The correct sequence is therefore: testicular enlargement → pubic hair → penile growth → peak height velocity.

| Sequence order | Pubertal change | Timing relative to other changes |
| --- | --- | --- |
| 1 | Testicular enlargement | First sign; volume above 4 mL; onset around 9–14 years |
| 2 | Pubic hair | Follows testicular enlargement |
| 3 | Penile growth | Lengthening first, then widening |
| 4 | Peak height velocity | Late in sequence; voice deepening and facial hair come after |

Key point! The growth spurt in boys occurs about 2 years later than in girls, which is why many adolescent boys appear shorter than their female peers in early adolescence. This is a normal variation, not a delay.

Watch out! A common error is to place pubic hair or penile growth before testicular enlargement. In clinical assessment, testicular volume measurement using an orchidometer is the most reliable early indicator of pubertal onset in boys [1]. If a boy shows pubic hair without testicular enlargement, consider precocious pseudopuberty or an adrenal source of androgens rather than true central puberty.

The interrelationship among these parameters is well documented: each stage of genital development correlates with specific hormonal changes, and the sequence remains consistent across populations even when the timing varies . Nurses working in adolescent-friendly services can use this predictable order to educate young clients about what to expect and when to seek further assessment.References (research sources)

- [1]Normal sexual maturation.Research articleSizonenko PC (1987)

## 임상 시나리오

Male Puberty SequenceExpected order of changes in boys aged 9–14 years
The first sign of male puberty is testicular enlargement, with volume above 4 mL or length above 2.5 cm, usually between 9 and 14 years. This reflects activation of the HPG axis and rising testosterone.

The usual sequence is testicular enlargement, then pubic hair, then penile growth (length first, then width), and finally peak height velocity. Voice deepening and facial hair appear even later.

CautionBoys reach their growth spurt about 2 years after girls, late in the pubertal sequence. Do not mistake pubic hair or penile growth as the first sign; testicular enlargement is the earliest observable change.

## 핵심 개념

- **Testicular enlargement** — The first observable sign of male puberty, typically occurring between 9 and 14 years when testicular volume exceeds 4 mL or length exceeds 2.5 cm.
- **Peak height velocity** — The adolescent growth spurt, which occurs late in male puberty after genital changes are well underway.
- **HPG axis** — Hypothalamic-pituitary-gonadal axis; its activation drives testicular testosterone production and spermatogenesis at puberty onset.
- **Tanner staging** — A standardized system for assessing pubertal development based on genital, pubic hair, and breast development stages.
- **Adolescent-friendly health service** — A service delivery approach that makes health care accessible and acceptable to clients aged 10 to 19 years.

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