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uro.testicular-torsion.v1PRODUCTION
uro.testicular-torsion.v1

Testicular torsion (time-critical scrotal emergency, <6 h salvage window)

urologyacuteadultpediatric
Hard-required inputs
0 / 8
Care setting:

Encounter flow

12/12 authored

Canonical 12-phase frame with authored status for this dossier.

Current phase

Frame

Detailed

Time-critical surgical emergency — door-to-OR clock starts at pain onset; preserve viable testis (AUA 2017)

Inputs
2
Actions
0
Advance rule
Set
Advance when

torsion suspected

Patient inputs (14)

Bimodal — neonates (extravaginal) and adolescents 12–18 y (intravaginal); bimodal incidence informs index of suspicion (AUA 2017)

High specificity feature in TWIST score (Barbosa 2013)

TWIST + clinical exam — high-riding testis with horizontal lie (Barbosa 2013)

High sensitivity (loss highly suggestive of torsion); TWIST component (Barbosa 2013)

Fever atypical — points more toward epididymitis or abscess; high fever + crepitus → Fournier (AUA 2017)

Time from onset directly drives salvage probability (≤6 h ~95%, 6–12 h ~70%, 12–24 h ~20%, >24 h <10%) and OR urgency (Barbosa 2013)

Hemodynamic baseline pre-OR (AUA 2017)

Pain-related tachycardia baseline (AUA 2017)

TWIST scoring; later finding (Barbosa 2013)

TWIST component — hard induration of testis (Barbosa 2013)

STI / UTI history points toward epididymitis (CDC STI 2021)

Trauma can precipitate torsion (intermittent or with frank rupture); rule out intratesticular hematoma / rupture (AUA 2017)

Decreased / absent intratesticular arterial flow + whirlpool sign of cord; high-resolution POCUS ~90% sensitive but operator-dependent — do NOT delay surgery if high clinical suspicion (Friedman 2017; AUA 2017)

Pyuria suggests epididymitis; absence supports torsion (AUA 2017)

* = hard-required. Engine cannot meaningfully run until these are filled.

Severity triggers (13)

13 need judgement
  • informationallife_threateninghigh_twist_score_or_high_clinical_suspicion
    TWIST score 5–7 OR sudden severe scrotal pain + N/V + absent cremasteric reflex + high-riding testis (Barbosa 2013)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationallife_threateningbilateral_torsion
    Bilateral pain or absent flow on both sides (AUA 2017)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalseveretime_onset_le_6h
    Symptom onset ≤6 h — salvage rate ~95% with prompt exploration (Barbosa 2013; AUA 2017)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalseveretime_onset_6_12h
    Symptom onset 6–12 h — salvage rate ~70%; still emergent OR (AUA 2017)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalseveretime_onset_12_24h
    Symptom onset 12–24 h — salvage rate ~20%; OR + explicit counselling on orchiectomy probability (AUA 2017)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalseveretime_onset_gt_24h
    Symptom onset >24 h — testicular death likely; salvage <10% (AUA 2017)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalsevereneonatal_phenotype
    Newborn / first-week-of-life hard, discoloured, painless scrotal mass — extravaginal torsion (typically antenatal) (EAU paediatric urology; AUA 2017)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalseverepocus_absent_flow
    High-resolution scrotal POCUS shows absent intratesticular arterial flow with or without whirlpool sign of cord (Friedman 2017)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalseverepediatric_adolescent_with_abdominal_pain_only
    Adolescent boy with isolated lower-abdominal pain — examine genitalia (AUA 2017)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalseveretrauma_with_scrotal_pain
    Trauma + scrotal pain with concern for torsion vs rupture (AUA 2017)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalmoderateintermittent_torsion
    Recurrent episodes of self-resolving severe scrotal pain ± high transverse lie on exam — intermittent torsion / detorsion phenotype (AUA 2017)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalmoderatebell_clapper
    High transverse lie on contralateral exam OR known bell-clapper deformity (intravaginal anatomy permitting twist around tunica vaginalis) (AUA 2017)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalmoderatemanual_detorsion_attempt
    Manual detorsion attempted as bridge to OR — outward "open like a book" rotation (Cochrane review; AUA 2017)
    Trigger could not be auto-evaluated — needs clinician judgement.

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Recommended regimen

Testicular torsion — perioperative supportive care + surgical pathway (AUA 2017)
axis: testicular_torsion_perioperativestep 1 - Tier 1 — Pre-operative analgesia + antiemetics + resuscitation (AUA 2017)
Selected step "Tier 1 — Pre-operative analgesia + antiemetics + resuscitation (AUA 2017)" — Suspected torsion + clinical decision to operate (do not delay for imaging)
  • morphine
    first line
    opioid
    0.1 mg/kg IV (typical 4–10 mg adult; weight-based 0.05–0.1 mg/kg pediatric) • IV • q3–4h PRN
    triggers: severe_pain
    Severe acute pain (AUA 2017)
    rxcui 7052
  • fentanyl
    add on
    opioid
    1 µg/kg IV (typical 25–100 µg adult) • IV • q5–15 min PRN
    triggers: shorter_half_life_needed, preop_titration
    Short-acting; preferred for titration (AUA 2017)
    rxcui 4337
  • ondansetron
    first line
    serotonin_5HT3_antagonist
    4 mg IV (peds 0.15 mg/kg, max 4 mg) • IV • q8h PRN
    triggers: nausea_vomiting
    Symptom control (AUA 2017)
    rxcui 26225
  • Lactated Ringer solution
    add on
    IV_crystalloid
    500–1000 mL bolus + maintenance (peds: weight-based) • IV • continuous
    triggers: NPO_preop
    Pre-op resuscitation; multi-ingredient balanced crystalloid (no single-ingredient RxCUI) (AUA 2017)
  • acetaminophen
    add on
    analgesic
    15 mg/kg PO/IV (max 1 g/dose adult) • PO/IV • q6h, max 4 g/day adult
    triggers: multimodal_analgesia
    Opioid-sparing (AUA 2017)
    rxcui 161

outpatient playbook — drug actions (1)

  1. 1. acetaminophen + ibuprofen
    Acetaminophen 650 mg q6h PRN + ibuprofen 400 mg q6h PRN • PO • PRN
    trigger: Residual post-op pain in first 1–2 wk
    Multimodal opioid-sparing (AUA 2017)

Auto-drafted A&P note

outpatient

Subjective

- Possible entry pathways: Sudden severe unilateral scrotal pain (AUA 2017); Scrotal pain with nausea / vomiting (high specificity; Barbosa 2013 TWIST); Adolescent male with isolated lower-abdominal pain — examine scrotum (AUA 2017).

Objective

- No vitals, labs, or imaging entered for this encounter.

Assessment

**Testicular torsion (time-critical scrotal emergency, <6 h salvage window)** (uro.testicular-torsion.v1).
Phenotype framing: Testicular torsion vs epididymitis / orchitis vs torsion of testicular appendage (blue-dot sign) vs incarcerated inguinal hernia vs scrotal trauma / rupture vs Henoch-Schönlein purpura vs idiopathic scrotal edema vs Fournier gangrene (AUA 2017)
Scope: Time-critical surgical emergency — door-to-OR clock starts at pain onset; preserve viable testis (AUA 2017)

No severity triggers fired against current inputs.

Plan

Regimen axis: **Testicular torsion — perioperative supportive care + surgical pathway (AUA 2017)** — step "Tier 1 — Pre-operative analgesia + antiemetics + resuscitation (AUA 2017)".
1. morphine 0.1 mg/kg IV (typical 4–10 mg adult; weight-based 0.05–0.1 mg/kg pediatric) IV q3–4h PRN (opioid, first line) — Severe acute pain (AUA 2017)
2. fentanyl 1 µg/kg IV (typical 25–100 µg adult) IV q5–15 min PRN (opioid, add on) — Short-acting; preferred for titration (AUA 2017)
3. ondansetron 4 mg IV (peds 0.15 mg/kg, max 4 mg) IV q8h PRN (serotonin_5HT3_antagonist, first line) — Symptom control (AUA 2017)
4. Lactated Ringer solution 500–1000 mL bolus + maintenance (peds: weight-based) IV continuous (IV_crystalloid, add on) — Pre-op resuscitation; multi-ingredient balanced crystalloid (no single-ingredient RxCUI) (AUA 2017)
5. acetaminophen 15 mg/kg PO/IV (max 1 g/dose adult) PO/IV q6h, max 4 g/day adult (analgesic, add on) — Opioid-sparing (AUA 2017)

Setting playbook (outpatient) — Long-term follow-up — wound healing, activity reclearance, semen analysis if indicated, psychosocial support, future contralateral fixation if not done at index, recurrent torsion surveillance, fertility counselling (AUA 2017; Arap 2015 long-term fertility)
6. acetaminophen + ibuprofen Acetaminophen 650 mg q6h PRN + ibuprofen 400 mg q6h PRN PO PRN — Residual post-op pain in first 1–2 wk (Multimodal opioid-sparing (AUA 2017))

Non-pharmacologic actions:
- Urology follow-up cadence: 1–2 wk wound check → 6 wk activity reclearance → 3–6 mo semen analysis if indicated → 12 mo final outcome capture (AUA 2017)
- Return-to-sport protocol: graded — no contact sport for 4–6 wk; protective cup recommended for ≥3 mo for collision sports (AUA 2017)
- Sexual activity reclearance at 4–6 wk per individual recovery (AUA 2017)
- Family-planning counselling tailored to operative outcome (orchiopexy vs orchiectomy) (Arap 2015)
- Patient education: future scrotal pain → STAT ED — never assume "just discomfort" given history
- School / sport / occupational note for activity restriction

AVOID / contraindication checks:
- NSAIDs_avoid_in_renal_impairment (AUA 2017)
- Opioid_dosing_lower_in_pediatric (AUA 2017)
- No_anticoagulation_routine_in_uncomplicated_post_op_torsion (AUA 2017)
- Activity_restriction_4_to_6_weeks_post_op (AUA 2017)

Monitoring

Regimen monitoring:
- preop pain q15 min (AUA 2017)
- intraop anesthesia
- postop vitals q1h then q4h (AUA 2017)
- wound check post op day 1 (AUA 2017)
- scrotal swelling assessment (AUA 2017)
- outpatient uro at 1 to 2 weeks (AUA 2017)
- outpatient uro at 6 weeks (AUA 2017)
- semen analysis at 3 to 6 months if orchiectomy or indicated (Arap 2015 long-term fertility)

Setting (outpatient) monitoring:
- Wound check 1–2 wk (AUA 2017)
- 6-wk scrotal exam (AUA 2017)
- Semen analysis at 3–6 mo if indicated (Arap 2015)
- Psychosocial PHQ-9 at 6 wk + 6 mo (AUA 2017)
- 12-mo final outcome capture — fertility, sexual function, recurrence (AUA 2017)

Follow-up plan: Outpatient urology 1–2 wk + 6 wk; semen analysis 3–6 mo (post-orchiectomy or unilateral pexy + family planning); psychological support if orchiectomy; fertility / hormone discussion; activity restriction 4–6 wk; contralateral fixation at later date if not done at index operation (long-term fertility data per Arap et al)
- Close-out criterion: follow-up scheduled

Monitoring phase: Post-op pain, scrotal swelling, return precautions, incision care; 1–2 wk outpatient urology; counsel on contralateral risk and pexy outcome (AUA 2017)

Disposition

Current setting: outpatient — Long-term follow-up — wound healing, activity reclearance, semen analysis if indicated, psychosocial support, future contralateral fixation if not done at index, recurrent torsion surveillance, fertility counselling (AUA 2017; Arap 2015 long-term fertility)

Disposition criteria:
- Discharge from urology follow-up at 12 mo if asymptomatic + cleared semen analysis (if obtained) + psychosocial stable (AUA 2017)

Escalation triggers (move to higher acuity):
- New scrotal pain → STAT ED — pexy failure or contralateral torsion (rare but possible) (AUA 2017)
- Abnormal semen analysis → reproductive endocrinology referral (Arap 2015)
- PHQ-9 ≥15 OR suicidal ideation → urgent psychiatric referral (AUA 2017)
- Hormone deficiency on 6-mo panel → endocrinology + consider testosterone replacement counselling

Earlier-Return Triggers

Return-precaution thresholds (watch for):
- [LIFE_THREATENING] TWIST score 5–7 OR sudden severe scrotal pain + N/V + absent cremasteric reflex + high-riding testis (Barbosa 2013)
- [LIFE_THREATENING] Bilateral pain or absent flow on both sides (AUA 2017)
- [SEVERE] Symptom onset ≤6 h — salvage rate ~95% with prompt exploration (Barbosa 2013; AUA 2017)

Citations

- TWIST clinical scoring system (Barbosa J Urol 2013) + POCUS for paediatric testicular torsion meta-analysis (Mori EMJ 2022) + color-Doppler US accuracy & clinical predictors (Liang AJR 2013) + time-dependent testicular salvage (Preece J Pediatr Urol 2017) [PMID:23103800](https://pubmed.ncbi.nlm.nih.gov/23103800/)
- Cited evidence (PMID 35523539) [PMID:35523539](https://pubmed.ncbi.nlm.nih.gov/35523539/)
- Cited evidence (PMID 23617512) [PMID:23617512](https://pubmed.ncbi.nlm.nih.gov/23617512/)
- Cited evidence (PMID 28527721) [PMID:28527721](https://pubmed.ncbi.nlm.nih.gov/28527721/)

Last reconciled with current guidelines: 2026-05-22.
References
  • TWIST clinical scoring system (Barbosa J Urol 2013) + POCUS for paediatric testicular torsion meta-analysis (Mori EMJ 2022) + color-Doppler US accuracy & clinical predictors (Liang AJR 2013) + time-dependent testicular salvage (Preece J Pediatr Urol 2017) — PMID:23103800
  • Cited evidence (PMID 35523539) — PMID:35523539
  • Cited evidence (PMID 23617512) — PMID:23617512
  • Cited evidence (PMID 28527721) — PMID:28527721