HAI Assistant

Enter patient information to calculate CLABSI risk and determine if CLABSI criteria are met.

Insertion day counts as Day 1 (calendar days). Eligible starting Day 3 (>2 days).

Assessment date = first element used to meet CLABSI criterion (within IWP).

If removed yesterday (assessment − 1), still device-associated. If removed on assessment date, it WAS in place that date.

(set assessment date or culture date)

Fever threshold is strictly > 38 °C (> 100.4 °F). The app converts °F → °C and applies the strict rule.

Surveillance helper: select organism. For skin flora (common commensals), NHSN requires ≥2 positive blood cultures on separate occasions plus symptoms.

Insertion day counts as Day 1 (calendar days). Eligible starting Day 3 (>2 days).

Assessment date = first element used to meet CLABSI criterion (within IWP).

If removed yesterday (assessment − 1), still device-associated. If removed on assessment date, it WAS in place that date.

Selecting organisms typically considered skin flora/common commensals will open a symptom window and commensal culture requirements below (per NHSN LCBI-2/3).

(set assessment date or culture date)

Fever threshold is strictly > 38 °C (> 100.4 °F). The app converts °F → °C and applies the strict rule.

NHSN requires ≥2 positive blood cultures with the same common commensal. [1] NHSN LCBI Checklist

Enter urinary catheter information and symptoms for CAUTI risk and determination.

Insertion day counts as Day 1. Eligible starting Day 3 (>2 days).

Assessment date = first element used to meet UTI/CAUTI criterion (within IWP).

If removed yesterday (assessment − 1), event can still be CAUTI-associated. If removed on assessment date, it WAS in place that date.

(set assessment date or culture date)

Fever threshold is strictly > 38 °C (> 100.4 °F). The app converts °F → °C and applies the strict rule.

Use this quick pathway to determine whether to obtain a blood culture or escalate for leadership review.

Use this pathway to guide appropriate urine culture ordering and when to involve unit leadership.

(hospitalization day will be calculated)

Testing typically requires ≥ 3 unformed stools within 24 h.

C. diff testing is most appropriate with stool types 6–7.

These factors can cause or contribute to diarrhea; consider before testing.

If positive within 30 days and symptomatic, provider may treat without re-testing; if no symptoms, avoid testing and treating. Avoid re-testing within 7 days unless symptoms worsen.

NHSN‑aligned decision support for evaluating potential Surgical Site Infections. Select the NHSN operative procedure and enter dates, then choose the deepest tissue level and applicable criteria.

Per ACS permitted use, external platforms may open the calculator in a new window/tab; embedding or automating it is not allowed.

Definition: PATOS is used when the surgeon explicitly documents that infection was visualized during the NHSN operative procedure—e.g., pus/abscess/infected tissue/gross contamination. If the note does not clearly say infection was seen, do not assign PATOS. ^[1]

Meets PATOS (examples):

“Purulence encountered,” “frank pus present,” “abscess identified in the wound.” ^[1]
“Gross contamination from perforated viscus” (e.g., perforated appendix with pus). ^[1]
“Infected tissue observed” (e.g., osteomyelitis seen intra‑operatively). ^[1]

Does not meet PATOS:

Only a suspicion or plan to treat infection; no intra‑op documentation of visible infection. ^[1]
Positive cultures alone (pre‑op, intra‑op, or post‑op) without a description of infection seen. ^[1]

Key NHSN notes:

PATOS applies only to the index NHSN operative procedure when infection is seen and documented at surgery. ^[1]
PATOS SSIs remain reportable; PATOS affects NHSN analysis/categorization (e.g., certain SIR handling). ^[1]

Footnotes
[1] CDC NHSN Surgical Site Infection Protocol (Chapter 9) and CDC SSI Checklist (PATOS guidance). See: CDC SSI Protocol PDF (“Surgical Site Infection Event”) and 2025 SSI Checklist. [1](https://apic.org/Resource_/TinyMceFileManager/Academy/ASC_101_resources/Surveillance_NHSN/NHSN_9pscSSIcurrent_jan2015.pdf)

The selected category determines the 30‑ vs 90‑day surveillance period (superficial incisional is always 30 days). Specific procedure (optional)

Filtered from CDC’s ICD‑10‑PCS/CPT → NHSN mapping for the chosen category/year. (Use for documentation clarity; SSI calculation remains based on NHSN category.)

(surveillance window will be calculated)

DOE within 30 days of procedure; involves only skin/subcutaneous tissue; then any ONE of the elements below.

DOE within 30 or 90 days (by category); involves deep soft tissues (fascia/muscle); then any ONE of the elements below.

DOE within 30 or 90 days (by category); involves organ/space (deeper than fascia/muscle); then any ONE below AND meets a site‑specific criterion.

Organ/Space SSI requires meeting a site‑specific definition (e.g., IAB, OREP, PJI). Use documentation to support this selection.

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CLABSI Risk

Microbiology timing (optional, improves IWP accuracy) IWP: 7 days

Signs & Symptoms within IWP

CLABSI Surveillance

Microbiology timing (optional, improves IWP accuracy) IWP: 7 days

Organism

Symptoms (required for selected organism)

Commensal Culture Requirements

CAUTI

Microbiology timing (recommended for IWP accuracy) IWP: 7 days

Signs & Symptoms within IWP

Blood Culture Escalation

Urine Culture Escalation

C. diff “Ticket to Test”

Diarrhea & stool characteristics

Other symptoms (supportive)

Potential confounders / alternatives

Prior C. diff testing

Team attestation

SSI Risk (NHSN)

Superficial Incisional — Criteria

Deep Incisional — Criteria

Organ/Space — Criteria

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