To meet the NHSN definitions, infections must be validated using the hospital acquired infection (HAI) standards \cite{0032a}. Infection rates can be stratified by unit types further defined by CDC \cite{0033}. Infections that were present on admission (POA) are not considered HAIs and not counted.
CLABSI and Line days can be collected through surveillance (at least once per month) or gathered through electronic documentation. Denominators documented electronically must match manual counts (+/- 5%) for a 3-month validation period.
CLABSI can be displayed as a Standardized Infection Ratios (SIR) using the following formula:
Expected infections are calculated by NHSN and available by location (unit type) from the baseline period.