Tanner Stages
To convert from ng/dL to nmol/L, multiply the ng/dL amount by 0.0347
II.Tanner Stage 2
III.Tanner Stage 3
IV.Tanner Stage 4
V.Tanner Stage 5
VI.Growth in Boyrs
VII.Reference
Tanner Stages
Age
1 - I
2-23ng/dL*
prepubertal
2 - II
5-70ng/dL
3 - III
15-280ng/dL
4 - IV
105-545ng/dL
5 - V
265-800ng/dL
* ng/dl = nanograms to the decilitre - U.S. quantity testosterone levels
I.Tanner Stage 1 (Prepubertal)
A. Testes
1. Smaller than 4 ml or long axis <2.5 cm
B. Pubic Hair
1. No coarse, pigmented hair
C. Penis Stage
1. No growth
A. Testes (Enlarge)
1. Size 4 ml or long axis >= 2.5 cm
2. Age 11.5 yr (9.5-13.5 yr)
B. Pubic Hair
1. Minimal coarse, pigmented hair at base of penis
2. Age 12.0 yr (9.9-14.0 yr)
C. Penis Stage
1. Earliest increased length and width
2. Age 11.5 yr (9.2-9.7 yr)
A. Testes (Enlarge)
1. Size 12 ml or long axis 3.6 cm
2. Age 14.0 yr (11.5-16.5 yr)
B. Pubic Hair
1. Coarse, dark curly hair spread over the pubis
2. Age 13.1 yr (11.2-15.0 yr)
C. Penis Stage
1. Increased length and width
2. Age 12.4 yr (10.1-14.6 yr)
A. Pubic Hair
1. Hair of adult quality
2. Not spread to junction of medial thigh with perineum
3. Age 13.9 yr (12.0-15.8 yr)
B. Penis Stage
1. Continued growth in length and width
2. Age 13.2 yr (11.2-15.3 yr)
A. Pubic Hair
1. Adult pubic hair distribution
B. Penis Stage
1. Male genital size
C. Secondary sexual characteristics
1. Facial hair present on sides
2. Mature male physique
3. Gynecomastia disappears
A. Peak height velocity: Age 13.5 (11.7-15.3 years)
B. Boys who mature average time: 9.5 (7.1-11.9) cm/yr
C. Boys who mature early: 10.3 (7.9-12.5) cm/yr
D. Boys who mature late: 8.5 (6.3-10.7) cm/yr
A. Tanner (1985) J Pediatr 107(3):317
B. Tanner (1966) Growth at Adolescence