Medicine:Breast measurement

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Short description: For size, shape, or developmental state

Breast measurement involves the measurement of the breasts for quantifying physical characteristics such as size, shape, and developmental state. A variety of different approaches have been employed for measuring the breasts.

Tanner staging

The Tanner scale for measuring breast maturation during puberty.
Main page: Medicine:Tanner scale

Tanner staging can be used to assess the developmental state of the breasts during puberty, from childhood (Tanner stage 1) to adulthood (Tanner stage 5).

Breast volume

Breast volume is a method of measuring the size of the breasts.[1][2] A variety of techniques have been used to measure breast volume, including water displacement, plaster casting, medical imaging (e.g., mammography, magnetic resonance imaging (MRI), ultrasound), and 3D scanning.[2][1] There is substantial measurement error with many breast volume measures, but MRI imaging appears to have among the lowest error and hence to be the most accurate measure.[1][2] However, 3D scanning might have the potential to become the new gold standard for clinical assessment.[3][4]

In a normative study of breast volumes in women using 3D scanning, breast volumes were median 515 mL, mean 650 mL, interquartile range 310 to 850 mL, and range ~50 to 3,100 mL.[5] In transgender women, breast volume measured with 3D scanning has been reported to reach a plateau of around 100 mL (but with an apparent range of up to 750 mL) after 3 to 4 years of hormone therapy.[6][7]

Breast circumference

The upper tape measure is breast circumference and the lower tape measure is underbust circumference.

Breast circumference, also known as bust circumference, is a measurement of the circumference of the torso at the level of the breasts. It has been used as a measure of breast size in normal young women,[8] in women with pregnancy,[9][10] and in transgender women.[11][12][13][14] Breast circumference is generally measured using a flexible fabric tape measure, and is the circumference across the breasts over the nipples to the back. The breast–chest difference is breast circumference minus band or underbust circumference and is used in the determination of bra cup size.

Breast–chest difference

Breast–chest difference is the difference of the breast circumference (upper line) and the underbust circumference (lower line).

Breast–chest difference, also known as bust–band difference, is a measurement used for quantifying breast size. It is calculated as bust circumference minus the band or underbust circumference. Breast–chest difference has been used in the measurement of breast development in transgender women on feminizing hormone therapy.[15][6][16][17][13]

Bra size

Bra size, also bra cup size, is a measurement of the breasts for selecting bras, taking into account breast size and torso circumference. It is determined using the breast–chest difference, with 12–14 cm equating to an A cup, 14–16 cm a B cup, 16–18 cm a C cup, and 18–20 cm a D cup.

Breast hemicircumference

Measurement of breast hemicircumference.[18]

Breast hemicircumference, also sometimes referred to as breast width or as breast circumference (incorrectly), is an anthropometric measure of the breasts which has been used in studies to assess breast development and breast size, including in transgender women.[19][15][20][18][21][22][23] It is the medial horizontal length (measured with a flexible tape measure) from one side of the breast to the other side and running over the nipple.[20][18][21] A measurement of 7 inches is said to correspond to an A cup, 8 inches to a B cup, 9 inches to a C cup, and so on, with each further 1-cm increment or decrement corresponding to one cup size up or down.[21]

Breast unit

The breast unit is a measurement of the breasts in which the breasts are measured horizontally and vertically and then these values are multiplied to given an overall idea of breast size.[24][25][26] It was devised by Vincent J. Capraro and has been used in pediatric endocrinology to quantify breast development.[24][25][26] The method has been described as follows:[26]

At times it is desirable to know whether or not a girl's breasts are developing normally by observing their increasing size over a period of several months. In some cases it is also advantageous to determine whether or not differences in the sizes of the two breasts are of clinical significance. In order to more accurately measure breast size, one of us (V.J.C.) devised a technique for breast measurement. This technique may be used in following up the development of normal breasts as well as of breasts showing asymmetric development. With a centimeter tape measure, the breast is measured from 3 o'clock to 9 o'clock (Fig. 23-4, A) and from 12 o'clock to 6 o'clock (Fig. 23-4, B). These two measurements are multiplied, yielding a figure called the breast unit. Table 23-3 shows the typical spread of breast units in a normal adolescent.

The breast unit has also been used to quantify breast size in girls and women with complete androgen insensitivity syndrome (CAIS) and other individuals with disorders of sexual development.[27][28][29]

References

  1. ↑ 1.0 1.1 1.2 "Objective breast volume, shape and surface area assessment: a systematic review of breast measurement methods". Aesthetic Plast Surg 38 (6): 1116–30. December 2014. doi:10.1007/s00266-014-0412-5. PMID 25338712. 
  2. ↑ 2.0 2.1 2.2 "The accuracy of breast volume measurement methods: A systematic review". Breast 28: 121–9. August 2016. doi:10.1016/j.breast.2016.05.010. PMID 27288864. 
  3. ↑ "Clinical Assessment of Breast Volume: Can 3D Imaging Be the Gold Standard?". Plast Reconstr Surg Glob Open 8 (11): e3236. November 2020. doi:10.1097/GOX.0000000000003236. PMID 33299702. 
  4. ↑ "Clinical assessment of breast symmetry and aesthetic outcome: can 3D imaging be the gold standard?". J Plast Surg Hand Surg 57 (1-6): 145–152. 2023. doi:10.1080/2000656X.2021.2024553. PMID 35034560. 
  5. ↑ "Breast volume is affected by body mass index but not age". Ergonomics 60 (11): 1576–1585. November 2017. doi:10.1080/00140139.2017.1330968. PMID 28532249. 
  6. ↑ 6.0 6.1 "Sustained Breast Development and Breast Anthropometric Changes in 3 Years of Gender-Affirming Hormone Treatment". J Clin Endocrinol Metab 106 (2): e782–e790. January 2021. doi:10.1210/clinem/dgaa841. PMID 33206172. 
  7. ↑ Boogers, L., Infirri, S. S., Bouchareb, A., de Blok, C., Liberton, N., van Trotsenburg, P., ... & Hannema, S. (2022, September). The effect of timing of puberty suppression on breast development in trans girls; a cross-sectional study. Hormone Research in Paediatrics, 95(Suppl 2), 390–391. https://abstracts.eurospe.org/hrp/0095/hrp0095p1-379
  8. ↑ "Stereotypical and Actual Associations of Breast Size with Mating-Relevant Traits". Arch Sex Behav 49 (3): 821–836. April 2020. doi:10.1007/s10508-019-1464-z. PMID 31562583. 
  9. ↑ "Unexpected changes in maternal breast size during pregnancy in relation to infant sex: an evolutionary interpretation". Am J Hum Biol 23 (4): 560–2. 2011. doi:10.1002/ajhb.21177. PMID 21544894. 
  10. ↑ Drąsutis, J. (2017). Krūtų morfologinių parametrų, kūno dydžio bei formos ir kraujo serumo prolaktino bei lipidų kitimai per nėštumą, daugialypės šių rodiklių sąsajos ir sveikatos rizikos morfologiniai žymenys (Doctoral dissertation, Vilniaus universitetas). https://epublications.vu.lt/object/elaba:23065971/
  11. ↑ Billowitz, A, ed (1989). "Physical Changes During Hormonal Treatment in Male-to-Female Transsexuals". Proceedings of the XIth Harry Benjamin International Gender Dysphoria Association Symposium, Cleveland, Ohio, September 20–23, 1989. Palo Alto, California: Harry Benjamin International Gender Dysphoria Association. pp. 14–15. https://scholar.google.com/scholar?cluster=11593636519491022859. 
  12. ↑ "Augmentation mammaplasty in male-to-female trans-sexuals: facts and figures from Amsterdam". Scand J Plast Reconstr Surg Hand Surg 35 (2): 203–6. June 2001. doi:10.1080/028443101300165354. PMID 11484531. 
  13. ↑ 13.0 13.1 "Cross-sex hormone therapy in trans persons is safe and effective at short-time follow-up: results from the European network for the investigation of gender incongruence". J Sex Med 11 (8): 1999–2011. August 2014. doi:10.1111/jsm.12571. PMID 24828032. 
  14. ↑ de, Blok Christel; Klaver, Maartje; Nota, Nienke; Dekker, Marieke; den, Heijer Martin (13 May 2016). "Breast development in male-to-female transgender patients after one year cross-sex hormonal treatment". Endocrine Abstracts. doi:10.1530/endoabs.41.GP146. 
  15. ↑ 15.0 15.1 "Relationship Between Serum Estradiol Concentrations and Clinical Outcomes in Transgender Individuals Undergoing Feminizing Hormone Therapy: A Narrative Review". Transgend Health 6 (3): 125–131. June 2021. doi:10.1089/trgh.2020.0077. PMID 34414268. 
  16. ↑ "Breast Development in Transwomen After 1 Year of Cross-Sex Hormone Therapy: Results of a Prospective Multicenter Study". J Clin Endocrinol Metab 103 (2): 532–538. February 2018. doi:10.1210/jc.2017-01927. PMID 29165635. 
  17. ↑ "Safety and rapid efficacy of guideline-based gender-affirming hormone therapy: an analysis of 388 individuals diagnosed with gender dysphoria". Eur J Endocrinol 182 (2): 149–156. February 2020. doi:10.1530/EJE-19-0463. PMID 31751300. 
  18. ↑ 18.0 18.1 18.2 "Physical and hormonal evaluation of transsexual patients: a longitudinal study". Arch Sex Behav 15 (2): 121–38. April 1986. doi:10.1007/BF01542220. PMID 3013122. 
  19. ↑ "Clinical review: Breast development in trans women receiving cross-sex hormones". J Sex Med 11 (5): 1240–7. May 2014. doi:10.1111/jsm.12487. PMID 24618412. 
  20. ↑ 20.0 20.1 "Physical and hormonal evaluation of transsexual patients during hormonal therapy". Arch Sex Behav 10 (4): 347–56. August 1981. doi:10.1007/BF01565538. PMID 6794543. 
  21. ↑ 21.0 21.1 21.2 "A new method for determining bra size and predicting postaugmentation breast size". Plast Reconstr Surg 102 (4): 1259–65. September 1998. doi:10.1097/00006534-199809040-00056. PMID 9734454. 
  22. ↑ Pechter, Edward A. (2009). "Method for Determining Bra Size and Predicting Postaugmentation Breast Size". Breast Augmentation. Springer Berlin Heidelberg. pp. 77–83. doi:10.1007/978-3-540-78948-2_11. 
  23. ↑ "An improved technique for determining bra size with applicability to breast surgery". Plast Reconstr Surg 121 (5): 348e–350e. May 2008. doi:10.1097/PRS.0b013e31816b1286. PMID 18453960. 
  24. ↑ 24.0 24.1 Capraro, Vincent J.; Dewhurst, Christopher J. (June 1975). "Breast Disorders in Childhood and Adolescence". Clinical Obstetrics and Gynecology 18 (2): 25–50. doi:10.1097/00003081-197506000-00003. ISSN 0009-9201. PMID 1170054. 
  25. ↑ 25.0 25.1 Vincent J. Capraro (1977). "Breast problems in adolescence". in Ross Laboratories. Adolescent Gynecology: Report of the Seventh Ross Roundtable on Critical Approaches to Common Pediatric Problems in Collaboration with the Ambulatory Pediatric Association. Ross Laboratories. pp. 25–31. OCLC 29172030. https://books.google.com/books?id=UMxsAAAAMAAJ. 
  26. ↑ 26.0 26.1 26.2 John William Huffman; Sir Christopher John Dewhurst; Vincent J. Capraro (1981). "The Breast and its Disorders in Childhood and Adolescence". The Gynecology of Childhood and Adolescence (2 ed.). Saunders. pp. 542–559. ISBN 978-0-7216-4816-3. OCLC 1011891134. https://books.google.com/books?id=9LhsAAAAMAAJ. 
  27. ↑ "Complete androgen insensitivity syndrome: long-term medical, surgical, and psychosexual outcome". J Clin Endocrinol Metab 85 (8): 2664–9. August 2000. doi:10.1210/jcem.85.8.6742. PMID 10946863. 
  28. ↑ "Congenital micropenis: long-term medical, surgical and psychosexual follow-up of individuals raised male or female". Horm Res 56 (1-2): 3–11. 2001. doi:10.1159/000048083. PMID 11815721. 
  29. ↑ "Ambiguous genitalia with perineoscrotal hypospadias in 46,XY individuals: long-term medical, surgical, and psychosexual outcome". Pediatrics 110 (3): e31. September 2002. doi:10.1542/peds.110.3.e31. PMID 12205281. 



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