Pap Smear

Aka: Pap Smear, Cervical Cytology, Cervical Smear, Papanicolaou Smear, Cervical Dysplasia

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II. Efficacy: Pap Smear

  1. Specificity of Pap Smear: 70%
  2. Sensitivity of Pap Smear: 80%
    1. Thin Prep Pap Smear
      1. Liquid based Pap Smear improves sensitivity
      2. Can be used for HPV DNA testing
      3. Will allow Gonorrhea and Chlamydia testing
      4. Reduces sampling error (e.g. drying artifact)
      5. Use spatula and cytobrush (instead of broom)
        1. Improves endocervical sampling
    2. Repeating Pap Smear improves sensitivity
      1. Repeated in short interval, sensitivity: 96%
      2. Third repeated in short interval: 99.2%
      3. Short interval is approximately 1 year

III. Precautions

  1. Abnormal visible cervical lesions indicate diagnostic Colposcopy (regardless of Pap Smear)
  2. Risk based testing has replaced more general protocols
    1. See ASCCP Calculated Risk Based Protocol
  3. Despite negative Pap Smears, HPV positive status confers higher risk at older ages
    1. Kjaer (2006) Cancer Res 66(21): 10630-6 [PubMed]

IV. Prognosis: Reassuring findings

  1. Negative HPV Test with a negative Pap Smear after age 30
    1. High longterm Negative Predictive Value
    2. Bigras (2005) Br J Cancer 93(5): 575-81 [PubMed]

V. Technique

  1. Preparation: Water-based Speculum lubrication
    1. Does not contaminate conventional Pap Smear slide
      1. Amies (2002) Obstet Gynecol 100:889-92 [PubMed]
      2. Harer (2002) Obstet Gynecol 100:887-8 [PubMed]
    2. Does not affect thin prep Pap Smear
      1. Note that thin-prep manufacturer recommends water
      2. Hathaway (2006) Obstet Gynecol 107:66-70 [PubMed]
  2. Tips to prevent unsatisfactory Pap Smears
    1. Avoid Pap Smear during time of Menses
    2. Avoid tampons and intercourse within 48 hours
    3. Blot Cervix prior to Pap Smear
    4. Focus on endocervical canal in postmenopausal women
  3. Step 1: Clean Cervix (clean only if large discharge)
    1. Gently wipe excess Cervical Mucus from os
    2. Use large cotton tipped swab
    3. Do not rinse Cervix with Saline
    4. Avoid performing Pap Smear during Menstruation
  4. Step 2: Sample the Cervix
    1. Order is critical for less blood
      1. First: Chlamydia cultures (if needed)
      2. Option 1: Conventional Pap Smear
        1. Second: Exocervix with Ayres spatula (or similar)
        2. Last: Endocervix with Brush (rotate 180 degrees)
      3. Option 2: Thin prep
        1. Liquid pap (with broom or spatula/brush as above)
        2. Reflex to HPV Testing (do not HPV Test under age 20 due to low predictive value)
    2. Conventional Pap Smear pointers
      1. Get exo- and endocervix before applying to slide
        1. Prevents one from drying while collecting other
        2. Thin prep eliminates drying risk
      2. Samples may be placed on top of one another
      3. Spread spatula material in one smooth stroke
      4. Roll the brush along slide by twirling handle
    3. Pregnancy
      1. Place brush only 50% into canal and sample sides
  5. Step 3: Fix Pap Smear Sample (except thin prep)
    1. Fix sample immediately to prevent air drying
    2. Air drying is common reason for ASCUS Pap Smear

VI. Labs

  1. HPV DNA
    1. Tested at age 30 regardless of Pap Smear results
    2. Directs further management of Cervical Cytology in age over 25-30 years old
    3. Not typically useful prior to age 25-30 years old
    4. Do not obtain more often than every 3 years
    5. Identify HPV Genotype if HPV positive result

VII. Findings

  1. Normal
    1. Bethesda: Normal
    2. World Health Organization (WHO): Normal
  2. Inadequate Pap Smear
  3. Negative Pap Smear Cytology but Missing Transformation Zone
  4. Benign Pap Smear Changes
    1. Vaginal Infection
    2. Reactive changes (Inflammation)
  5. ASCUS Pap Smear
    1. Atypical Squamous Cells of Undetermined Significance
  6. AGUS Pap Smear or Endometrial Cells
    1. Atypical Glandular Cells of Undetermined Significance
    2. Endometrial Cells in postmenopausal women with an intact Uterus should prompt Endometrial Biopsy
  7. Cervical Intraepithelial Neoplasia (Dysplasia)
    1. Mild Dysplasia
      1. Bethesda: Low Grade SIL
      2. WHO: CIN I
      3. Risk of progression
        1. Regresses spontaneously in 60% of cases
        2. Persists in 30% of cases
        3. Progresses to CIN III in 10% of cases
        4. Progresses to invasive cancer 1% of cases
    2. Moderate Dysplasia
      1. WHO: CIN II
      2. Risk of progression
        1. Regresses spontaneously in 40% of cases
        2. Persists in 40% of cases
        3. Progresses to CIN III in 15% of cases
        4. Progresses to invasive cancer 5% of cases
    3. Severe dysplasia
      1. Bethesda: High Grade SIL
      2. WHO: CIN III
      3. Risk of progression
        1. Regresses spontaneously in 33% of cases
        2. Persists in 55% of cases
        3. Progresses to invasive cancer >12% of cases
  8. Cervical Adenocarcinoma In-Situ (Pre-invasive Cervical Cancer)
  9. Cervical Cancer
  10. References
    1. Ostor (1993) Int J Gynecol Pathol 12(2): 186-92 [PubMed]

VIII. Management: Primary HPV Screening Protocol

  1. See Pap Smear Intervals (includes ASCCP Calculated Risk Based Protocol)
  2. HPV DNA negative
    1. Routine screening
  3. HPV DNA high risk type 16 or 18
    1. Colposcopy
  4. HPV DNA other high risk type (31, 33, 35, 39, 45, 51, 52, 56, 58, 59, 66, 68)
    1. Negative Cervical Cytology
      1. Repeat Cervical Cytology in one year
    2. Positive Cervical Cytology for ASCUS or higher
      1. Colposcopy
  5. References
    1. Huh (2015) Gynecol Oncol 136(2): 178-82 [PubMed]

IX. Management: Benign or Mild Pap Smear Changes

  1. See Inadequate Pap Smear
  2. See Negative Pap Smear Cytology but Missing Transformation Zone
  3. See Benign Pap Smear Changes

X. Management: Abnormal Pap Smear

  1. See ASCUS Pap Smear (Pap Smear Atypia)
    1. ASC-H should be managed as abnormal with Colposcopy
  2. See AGUS Pap Smear
  3. See Low Grade Squamous Intraepithelial Lesion (LSIL)
  4. See High Grade Squamous Intraepithelial Lesion (HSIL)
  5. See Cervical Cancer

XI. Resources

  1. American Society for Colposcopy and Cervical Pathology
    1. http://www.asccp.org
  2. (2014) ASCCP Guidelines
    1. http://www.asccp.org/Guidelines-2/Management-Guidelines-2
  3. (2019) ASCCP Guidelines
    1. https://www.asccp.org/management-guidelines

XII. References

  1. Boon (1989) Acta Cytol 33(6):843-8 [PubMed]
  2. Brotzman (1996) Am Fam Physician 53(4):1154-62 [PubMed]
  3. Fowler (1993) Postgrad Med 93(2):57-70 [PubMed]
  4. Kurman (1994) JAMA 271(23):1866-9 [PubMed]
  5. Koss (1989) JAMA 261(5):737-43 [PubMed]
  6. Miller (1992) Am Fam Physician 45(1):143-50 [PubMed]
  7. Orr (1992) Gynecol Oncol 44:260-2 [PubMed]
  8. Rerucha (2018) Am Fam Physician 97(7): 441-8 [PubMed]
  9. Shepherd (1995) Am Fam Physician 51(2):434-40 [PubMed]
  10. Stack (1997) Postgrad Med 101(4):207-4 [PubMed]

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Related Studies

Ontology: Cervical dysplasia (C0007868)

Definition (MSH) Abnormal development of immature squamous EPITHELIAL CELLS of the UTERINE CERVIX, a term used to describe premalignant cytological changes in the cervical EPITHELIUM. These atypical cells do not penetrate the epithelial BASEMENT MEMBRANE.
Concepts Disease or Syndrome (T047)
MSH D002578
ICD9 622.10, 622.1
ICD10 N87 , N87.9
SnomedCT 156012002, 198345008, 270495002, 198340003, 73391008
English Dysplasia of cervix (uteri), CERVICAL DYSPLASIA, Dysplasia, Cervix, Dysplasia of cervix uteri, unspecified, Dysplasia of cervix NOS, Cervical dysplasia NOS, Uterine Cervical Dysplasia [Disease/Finding], Dysplasia;cervical, cervix dysplasia, dysplasia of cervix, cervical precancer, Cervical Dysplasia, Dysplasia of cervix uteri (disorder), Dysplasia of cervix NOS (disorder), Dysplasia of cervix, Dysplasia of cervix uteri, Dysplasia of cervix (disorder), cervix; dysplasia, dysplasia; cervix, Cervical dysplasia, Dysplasia of cervix, unspecified, Cervix Dysplasia, Cervical Dysplasia, Uterine, Dysplasia, Uterine Cervical, Uterine Cervical Dysplasia, cervical dysplasia
German ZERVIXDYSPLASIE, Dysplasie der Cervix uteri, Dysplasie der Cervix uteri, nicht naeher bezeichnet, Zervixdysplasie
Dutch cervix (uteri) dysplasie, cervix; dysplasie, dysplasie; cervix, Dysplasie van cervix uteri, niet gespecificeerd, cervicale dysplasie, Dysplasie van cervix uteri, Cervixdysplasie, Dysplasie, baarmoederhals-, Dysplasie, cervix-
Portuguese Displasia do colo do útero, DISPLASIA CERVICAL, Displasia do Colo Uterino, Displasia Cervical Uterina, Displasia cervical, Displasia Cervical, Displasia do Colo do Útero
Spanish Displasia del cérvix, CUELLO UTERINO, DISPLASIA, Displasia del Cuello del Útero, displasia de cérvix, displasia del cuello uterino, SAI, displasia del cuello uterino, SAI (trastorno), Displasia del Cuello Uterino, Displasia Cervical Uterina, Displasia Cérvico-Uterina, Displasia Cérvicouterina, displasia cervical, displasia de cuello uterino (trastorno), displasia de cuello uterino, Displasia de cérvix, Displasia Cervical
Japanese 子宮頚部上皮異形成, ｼｷｭｳｹｲﾌﾞｲｹｲｾｲ, ｼｷｭｳｹｲﾌﾞｼﾞｮｳﾋｲｹｲｾｲ, 子宮頸部異形成, 子宮頚異形成上皮, 子宮頚部異形成, 子宮頚部異形成上皮, 子宮頸部異形成上皮
Swedish Livmoderhalsdysplasi
Czech cervix uteri - dysplazie, Cervikální dysplazie, Dysplazie hrdla (děložního)
Finnish Kohdunkaulan dysplasia
Russian SHEIKI MATKI DISPLAZIIA, ШЕЙКИ МАТКИ ДИСПЛАЗИЯ
French DYSPLASIE CERVICALE, Dysplasie du col de l'utérus, Dysplasie du col utérin, Col dysplasique, Dysplasie cervicale de l'utérus, Dysplasie cervicale
Italian Displasia della cervice, Displasia della cervice uterina
Korean 상세불명의 자궁목의 형성이상, 자궁목의 형성이상
Croatian CERVIKALNA DISPLAZIJA, VRAT MATERNICE, DISPLAZIJA, CERVIKS UTERUSA, DISPLAZIJA
Polish Dysplazja szyjkowa
Hungarian Cervix dysplasia, Cervix (uteri) dysplasia
Norwegian Livmorhalsdysplasi, Cervixdysplasi
Derived from the NIH UMLS (Unified Medical Language System)

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