Value of preoperative tests in influencing preoperative management and predicting postoperative complications in adults

Test	Incidence of abnormalities that influence management, percent	Positive likelihood ratio of postoperative complication, LR+	Negative likelihood ratio of postoperative complication, LR-
Hemoglobin	0.1	3.3	0.90
White blood cell count	0.0	0.0	1.00
Platelet count	0.0	0.0	1.00
Prothrombin time (PT)	0.0	0.0	1.01
Partial thromboplastin time (PTT)	0.1	1.7	0.86
Electrolytes	1.8	4.3*	0.80
Renal function	2.6	3.3	0.81
Glucose	0.5	1.6	0.85
Liver function tests	0.1	NA^¶	NA^¶
Urinalysis	1.4	1.7	0.97
Electrocardiogram	2.6	1.6	0.96
Chest radiograph	3.0	2.5	0.72

* Although the LR+ value is higher for electrolytes than for other preoperative tests, most of these patients could have been selectively identified as candidates for testing based on clinical criteria. The authors therefore do not recommend routine measurement of preoperative electrolytes.
¶ NA = Not available; no studies have reported the incidence of adverse events in a cohort of healthy patients with normal or abnormal liver function tests.

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خرید پکیج

Value of preoperative tests in influencing preoperative management and predicting postoperative complications in adults