TABLE 3.
Positive predictive values (with 95% confidence intervals) of case-identifying algorithms to identify acute pancreatitis among patients in the VHA
| Algorithm | N confirmed AP |
Total examined in algorithm |
PPV (95% CI) | Reason not confirmed | |||
|---|---|---|---|---|---|---|---|
| Probable APa |
Unlikely APb |
Chronic pancreatitis |
Completely miscodedc |
||||
| ICD-9/10 Code | 44 | 76 | 57.9 (46.8–69.0) | 9 | 13 | – | 10i |
| ICD-9/10 Code + lipase ≥200 | 90 | 101 | 89.1 (83.0–95.2) | 7 | 3 | 1 | – |
Abbreviation: AP, acute pancreatitis.
a
Abdominal pain present, lipase values high but not ≥3x ULN, and imaging (ultrasound, CT, or MRI) either not performed or normal.
b
No abdominal pain, normal imaging, lipase value elevated.
c
No mention of acute pancreatitis in any notes, no lipase or amylase values ordered, no imaging, no abdominal pain.